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1. Accumulation of quaternary ammonium compounds as emerging contaminants in sediments collected from the Pearl River Estuary, China and Tokyo Bay, Japan

Author:
Xi Dai; Cuicui Wang; James C.W. Lam; Nobuyoshi Yamashita; Eriko Yamazaki; Yuichi Horii; Weifang Chen; Xiaolin Li
Source:
Marine pollution bulletin 2018 v.136 pp. 276-281
ISSN:
0025-326X
Subject:
benzalkonium chloride; estuaries; products and commodities; quaternary ammonium compounds; rivers; sediments; water pollution; China; Japan
Abstract:
... In this work, the distribution of quaternary ammonium compounds (QACs) in two dated sediment cores, collected from the Pearl River Estuary (PRE) and Tokyo Bay (TB), were investigated to understand the historical input of QACs and their diagenetic behavior in urban estuarine environments. The vertical variation profiles of QAC concentrations showed that benzylalkyldimethyl ammonium compounds (BACs) ...
DOI:
10.1016/j.marpolbul.2018.09.027

2. Active forearc shortening in Tohoku, Japan: Constraints on fault geometry from erosion rates and fluvial longitudinal profiles

Author:
Christine Regalla; Eric Kirby; Donald Fisher; Paul Bierman
Source:
Geomorphology 2013 v.195 no. pp. 84-98
ISSN:
0169-555X
Subject:
basins; landscapes; mathematical models; rivers; sediments; streams; tectonics; Japan
Abstract:
... Convexities in the longitudinal profiles of actively incising rivers are typically considered to represent the morphologic signal of a transient response to external perturbations in tectonic or climatic forcing. Distinguishing such knickzones from those that may be anchored to the channel network by spatial variations in rock uplift, however, can be challenging. Here, we combine stream profile an ...
DOI:
10.1016/j.geomorph.2013.04.029

3. Additive Effects of Sediment and Nutrient on Leaf Litter Decomposition and Macroinvertebrates in Hyporheic Zone

Author:
Md. Khorshed Alam; Junjiro N. Negishi; Pongpet Pongsivapai; Shohei Yamashita; Tomohiro Nakagawa
Source:
Water 2021 v.13 no.10 pp. -
ISSN:
2073-4441
Subject:
Alnus japonica; Japan; detritivores; hyporheic zone; leaves; macroinvertebrates; nitrates; particle size; plant litter; rivers; sediments; water
Abstract:
... Despite the fact that leaf decomposition constitutes an important function in rivers, how multiple environmental stressors simultaneously affect it remains largely unknown. This study investigated the interactive effects of fine sediments (particle size: <2 mm; experimentally manipulated) and a specific nutrient (i.e., nitrate) on subsurface (hyporheic) leaf litter decomposition rate and macroinve ...
DOI:
10.3390/w13101340

4. Adopting deep learning methods for airborne RGB fluvial scene classification

Author:
Patrice E. Carbonneau; Stephen J. Dugdale; Toby P. Breckon; James T. Dietrich; Mark A. Fonstad; Hitoshi Miyamoto; Amy S. Woodget
Source:
Remote sensing of environment 2020 v.251 pp. 112107
ISSN:
0034-4257
Subject:
Japan; data collection; environment; humans; image interpretation; labor; land cover; landscapes; neural networks; riparian areas; rivers; sediments; statistical analysis; vegetation; Canada; Costa Rica; Italy; United Kingdom
Abstract:
... Rivers are among the world's most threatened ecosystems. Enabled by the rapid development of drone technology, hyperspatial resolution (<10 cm) images of fluvial environments are now a common data source used to better understand these sensitive habitats. However, the task of image classification remains challenging for this type of imagery and the application of traditional classification algorit ...
DOI:
10.1016/j.rse.2020.112107

5. Analysis of Bed Load Equations and River Bed Level Variations Using Basin-Scale Process-Based Modelling Approach

Author:
Md Aynul Kabir; Dushmanta Dutta; Sadayuki Hironaka; Alexis Pang
Source:
Water resources management 2012 v.26 no.5 pp. 1143-1163
ISSN:
0920-4741
Subject:
case studies; dynamic models; ecosystems; equations; particle size; pollution load; rivers; sediments; shear stress; stream channels; surpluses; watersheds; Japan
Abstract:
... Bed load transport is a key process in maintaining the dynamically stable channel geometry for restoring the form and function of river ecosystems. Bed load consists of relatively large sediment particles that are moved along the streambed by rolling, sliding or saltation. Currently, various empirical correlations are used to estimate bed load transport rates since no single procedure, whether the ...
DOI:
10.1007/s11269-011-9951-6

6. Anthropogenic disruption to the seismic driving of beach ridge formation: The Sendai coast, Japan

Author:
James Goff; Jasper Knight; Daisuke Sugawara; James P. Terry
Source:
Science of the total environment 2016 v.544 pp. 18-23
ISSN:
0048-9697
Subject:
bedload; coasts; dams (hydrology); earthquakes; geophysics; models; rivers; sediment traps; sediments; suspended sediment; tsunamis; watersheds; Japan
Abstract:
... The expected geomorphic after-effects of the Mw 9.0 Tōhoku-oki earthquake of 11 March 2011 (eastern Japan) are summarized by a schematic model of seismic driving, which details seismogenic disturbances to sediment systems that affect the rate or timing of sediment delivery to coastlines over timescales of 10²–10⁴years. The immediate physical environmental responses to this high-magnitude earthquak ...
DOI:
10.1016/j.scitotenv.2015.11.106

7. Application of Backpack-Mounted Mobile Mapping System and Rainfall–Runoff–Inundation Model for Flash Flood Analysis

Author:
Takahiro Sayama; Koji Matsumoto; Yuji Kuwano; Kaoru Takara
Source:
Water 2019 v.11 no.5 pp. -
ISSN:
2073-4441
Subject:
case studies; floods; models; mountains; remote sensing; rivers; satellites; sediments; surveys; topography; watersheds; Japan
Abstract:
... Satellite remote sensing has been used effectively to estimate flood inundation extents in large river basins. In the case of flash floods in mountainous catchments, however, it is difficult to use remote sensing information. To compensate for this situation, detailed rainfall–runoff and flood inundation models have been utilized. Regardless of the recent technological advances in simulation ...
DOI:
10.3390/w11050963

8. Assessing high impacts of climate change: spatial characteristics and relationships of hydrological ecosystem services in northern Japan (Teshio River watershed)

Author:
Min Fan; Hideaki Shibata; Li Chen
Source:
Mitigation and adaptation strategies for global change 2018 v.23 no.4 pp. 525-552
ISSN:
1381-2386
Subject:
Soil and Water Assessment Tool model; climate; climate change; ecosystem services; ecosystems; land use; nutrient management; nutrient retention; planning; riparian vegetation; rivers; sediments; stakeholders; sustainable development; watersheds; Japan
Abstract:
... Ecosystem services (ESs) provide information on the tendency of ecosystems to reach and form a state of equilibrium. The process of ES changes is important in order to identify the climate change-related causes that occur regionally to globally. ES-based management plays an important role in mitigation strategies for the negative impact of global climate change on ecosystem. Therefore, it is neces ...
DOI:
10.1007/s11027-017-9748-x

9. Assessing the impact of 1498 Meio earthquake and tsunami along the Enshu-nada coast, central Japan using coastal geology

Author:
Osamu Fujiwara; Eisuke Ono; Toshifumi Yata; Masatomo Umitsu; Yoshiki Sato; Vanessa M.A. Heyvaert
Source:
Quaternary international 2013 v.308-309 no. pp. 4-12
ISSN:
1040-6182
Subject:
coasts; earthquakes; marshes; mass transfer; rivers; sediments; social change; tsunamis; Japan; Pacific Ocean
Abstract:
... The AD 1498 Meio earthquake (M8.2∼8.4) that occurred along the eastern Nankai trough, and the tsunami generated by the earthquake, induced major geomorphological and social changes along the Pacific coast of central Japan. Geological coring along the palaeochannel of the Hamana River, southern Shizuoka Prefecture, revealed that its river mouth was abruptly closed followed by a rapid change from ri ...
DOI:
10.1016/j.quaint.2012.12.009

10. Assessment of Heavy Metal Pollution in the Sediments of the River Pra and Its Tributaries

Author:
Albert Ebo Duncan; Nanne de Vries; Kwabena Biritwum Nyarko
Source:
Water, air, and soil pollution 2018 v.229 no.8 pp. 272
ISSN:
0049-6979
Subject:
anthropogenic activities; arsenic; atomic absorption spectrometry; basins; cadmium; chromium; dry season; heavy metals; hydrides; iron; lead; manganese; mining; models; nickel; pollution load; rivers; sediments; wet season; zinc; Ghana; Japan
Abstract:
... An investigative study was conducted to determine the heavy metal pollution in the sediment in the Pra Basin of Ghana from 27 sampling points during the dry and wet seasons using the geo-accumulation index (Igeo), enrichment factor (EF), and pollution load index (PLI). Sediments were acid digested and analyzed for the following selected metals: arsenic (As), lead (Pb), cadmium (Cd), zinc (Zn), man ...
DOI:
10.1007/s11270-018-3899-6
PubMed:
30147192
PubMed Central:
PMC6096550

11. Assessment of dam removal from geochemical examination of Kuma River sediment, Kyushu, Japan

Author:
Sansfica M. Young; Hiroaki Ishiga
Source:
Environmental monitoring and assessment 2014 v.186 no.12 pp. 8267-8289
ISSN:
0167-6369
Subject:
chromium; copper; dams (hydrology); environmental monitoring; guidelines; lead; rivers; sediment contamination; sediments; zinc; zirconium; Japan
Abstract:
... The aim of this study was to determine if Arase dam gate removal and flushing elevated concentrations of any trace elements in Kuma River and Yatsushiro Bay sediments or caused riverine environmental change. The Arase dam gate on the Kuma River was opened in April 2010. Surface and bottom sediments were compared using 10-cm-long cores (2011) and two grain size fractions. Surface sediment data from ...
DOI:
10.1007/s10661-014-4002-4
PubMed:
25182684

12. Assessment of denitrification process in lower Ishikari river system, Japan

Author:
Pawan Kumar Jha; Masao Minagawa
Source:
Chemosphere 2013 v.93 pp. 1726-1733
ISSN:
0045-6535
Subject:
carbon; denitrification; glucose; hydrology; lakes; models; nitrates; nitrogen; organic matter; rivers; sediments; stream channels; watersheds; Japan
Abstract:
... Sediment denitrification rate and its role in removal of dissolved nitrate load in lower Ishikari river system were examined. Denitrification rate were measured using acetylene inhibition technique on the sediment samples collected during August 2009–July 2010. The denitrification rate varied from 0.001 to 1.9μgNg−1DMh−1 with an average value of 0.21μgNg−1DMh−1 in lower Ishikari river system. Deni ...
DOI:
10.1016/j.chemosphere.2013.05.048
PubMed:
23786812

13. Bacterial community structure analysis of sediment in the Sagami River, Japan using a rapid approach based on two-dimensional DNA gel electrophoresis mapping with selective primer pairs

Author:
Guo-hua Liu; Narasimmalu Rajendran; Takashi Amemiya; Kiminori Itoh
Source:
Environmental monitoring and assessment 2011 v.182 no.1-4 pp. 187-195
ISSN:
0167-6369
Subject:
DNA; bacterial communities; biomass; community structure; delta-Proteobacteria; denaturing gradient gel electrophoresis; gels; rivers; sediment contamination; sediments; two-dimensional gel electrophoresis; Japan
Abstract:
... A rapid approach based on two-dimensional DNA gel electrophroesis (2-DGE) mapping with selective primer pairs was employed to analyze bacterial community structure in sediments from upstream, midstream and downstream of Sagami River in Japan. The 2-DGE maps indicated that Alpha- and Delta-proteobacteria were major bacterial populations in the upstream and midstream sediments. Further bacterial com ...
DOI:
10.1007/s10661-010-1868-7
PubMed:
21222030

14. Behavior of Elements in the Takahashi, Japan River Basin

Author:
Hisayuki Teraoka; Michihiro Ogawa
Source:
Journal of environmental quality 1984 v.13 no.3 pp. 453-459
ISSN:
0047-2425
Subject:
air pollution; basins; cadmium; chromium; cobalt; copper; dams (hydrology); estuaries; iron; lead; manganese; nickel; river water; rivers; rocks; sediments; silver; tin; topsoil; total suspended solids; watersheds; zinc; Japan
Abstract:
... Concentrations of 22 elements in suspended and dissolved solids in rivers, various sieved particles, and interstitial waters of dam sediments were determined in the Takahashi River Basin on whose estuary stands the Mizushima industrial area, one of the biggest in Japan. In this basin, because of the increased atmospheric pollution, the input of the volatile elements Zn, Cd, Sn, Pb, and Ag from the ...
DOI:
10.2134/jeq1984.00472425001300030025x

15. Behavior of mercury from the fumarolic activity of Mt. Myoko, Japan: production of methylmercury and ethylmercury in forest soil

Author:
Hitoshi Kodamatani; Souta Katsuma; Azusa Shigetomi; Toshimune Hokazono; Ryusuke Imura; Ryo Kanzaki; Takashi Tomiyasu
Source:
Environmental earth sciences 2018 v.77 no.13 pp. 478
ISSN:
1866-6280
Subject:
air; bamboos; coprecipitation; ferric hydroxide; leaves; mercury; methylmercury compounds; rivers; sediments; soil; soil sampling; spatial distribution; Japan
Abstract:
... The behavior of mercury (Hg) in water, sediments, air, dwarf bamboo leaves, and soils around the fumarolic area of Mt. Myoko, Japan, was investigated. Although some of the hot spring water samples contained over 1 µg/L total-Hg, overall, the total-Hg concentrations in the water samples decreased rapidly as the water flowed into a river. The total-Hg concentrations decreased not only due to simple ...
DOI:
10.1007/s12665-018-7616-y

16. Behaviour of radiocaesium in coastal rivers of the Fukushima Prefecture (Japan) during conditions of low flow and low turbidity – Insight on the possible role of small particles and detrital organic compounds

Author:
Frédérique Eyrolle-Boyer; Patrick Boyer; Laurent Garcia-Sanchez; Jean-Michel Métivier; Yuichi Onda; Anne De Vismes; Xavier Cagnat; Béatrice Boulet; Catherine Cossonnet
Source:
Journal of environmental radioactivity 2016 v.151 pp. 328-340
ISSN:
0265-931X
Subject:
base flow; biomass; detectors; estuaries; forest litter; inventories; marine environment; organic compounds; polluted soils; radioactivity; river water; rivers; sediment traps; sediments; stream channels; suspended sediment; turbidity; watersheds; Japan
Abstract:
... To investigate riverine transfers from contaminated soils of the Fukushima Prefecture in Japan to the marine environment, suspended sediments, filtered water, sediments and detrital organic macro debris deposited onto river beds were collected in November 2013 within small coastal rivers during conditions of low flow rates and low turbidity. River waters were directly filtered on the field and hig ...
DOI:
10.1016/j.jenvrad.2015.10.028

17. Bisphenol A and other bisphenol analogues including BPS and BPF in surface water samples from Japan, China, Korea and India

Author:
Eriko Yamazaki; Nobuyoshi Yamashita; Sachi Taniyasu; James Lam; Paul K.S. Lam; Hyo-Bang Moon; Yunsun Jeong; Pranav Kannan; Hema Achyuthan; Natesan Munuswamy; Kurunthachalam Kannan
Source:
Ecotoxicology and environmental safety 2015 v.122 pp. 565-572
ISSN:
0147-6513
Subject:
bisphenol A; rivers; sediments; surface water; toxicity; China; India; Japan; Korean Peninsula; South East Asia
Abstract:
... Concentrations of eight bisphenol analogues (BPs) including BPA, BPS, and BPF were determined in surface waters collected from select rivers in Japan, Korea, China, and India. BPA was found at a concentration in the range of several tens to several hundreds of nanograms per liter in most of the rivers surveyed and some of the highest concentrations (54–1950ng/L) were found in rivers in Chennai, In ...
DOI:
10.1016/j.ecoenv.2015.09.029

18. Branched and isoprenoid glycerol dialkyl glycerol tetraethers in soils and lake/river sediments in Lake Biwa basin and implications for MBT/CBT proxies

Author:
Taku Ajioka; Masanobu Yamamoto; Jun Murase
Source:
Organic geochemistry 2014 v.73 pp. 70-82
ISSN:
0146-6380
Subject:
air temperature; basins; ethers; glycerol; isoprenoids; lakes; methylation; microbial communities; pH; paleoecology; rivers; sediments; soil profiles; soil sequences; subsurface soil layers; watersheds; Japan
Abstract:
... We investigated glycerol dialkyl glycerol tetraether (GDGT) distributions in soils and river/lake sediments in the Lake Biwa basin of central Japan, in order to understand their source and fate in a terrigenous environment. GDGTs in 16 soil profiles exhibited significant depth variation at each site. Branched (br) GDGTs were generally most abundant in the surface litter layer (O layer) and decreas ...
DOI:
10.1016/j.orggeochem.2014.05.009

19. Carbaryl residue concentrations, degradation, and major sinks in the Seto Inland Sea, Japan

Author:
Aly Derbalah; Russel Chidya; Chikumbusko Kaonga; Yoko Iwamoto; Kazuhiko Takeda; Hiroshi Sakugawa
Source:
Environmental science and pollution research international 2020 v.27 no.13 pp. 14668-14678
ISSN:
0944-1344
Subject:
Japan; biodegradation; carbaryl; fish; half life; human health; hydrolysis; models; photolysis; plankton; pollution; research; river water; rivers; seawater; sediments
Abstract:
... The fate of carbaryl in the Seto Inland Sea (west Japan) was predicted using a mass distribution model using carbaryl concentrations in river and sea water samples, degradation data, and published data. The predicted carbaryl concentrations in water in Kurose River and the Seto Inland Sea were 4.320 and 0.2134 μg/L, respectively, and the predicted concentrations in plankton, fish, and sediment wer ...
DOI:
10.1007/s11356-020-08010-0

20. Characteristics of radiocesium contamination of dry riverbeds due to the Fukushima Daiichi Nuclear Power Plant accident assessed by airborne radiation monitoring

Author:
Kazuhiro Azami; Takahiro Ootagaki; Mutsushi Ishida; Yukihisa Sanada
Source:
Landscape and ecological engineering 2018 v.14 no.1 pp. 3-15
ISSN:
1860-1871
Subject:
accidents; cesium; earthquakes; helicopters; monitoring; nuclear power; power plants; radionuclides; rivers; sediments; soil; soil pollution; soil sampling; stream channels; tsunamis; typhoons; watersheds; Japan
Abstract:
... The Great East Japan Earthquake that occurred on 11 March 2011 generated a series of massive tsunami waves that caused severe damage to the Fukushima Daiichi Nuclear Power Plant, following which large amounts of radioactive materials were discharged from the power plant into the environment. Given the recently developed technologies for unmanned helicopters and their potential application in airbo ...
DOI:
10.1007/s11355-017-0332-z

21. Characteristics of sediment dynamics following large-scale sediment supply events in mountain watersheds in Japan

Author:
Hiroaki Izumiyama; Taro Uchida; Katsuya Horie; Wataru Sakurai
Source:
Geomorphology 2020 v.367 pp. 107301
ISSN:
0169-555X
Subject:
basins; earthquakes; rain; risk; rivers; sediment yield; sediments; time series analysis; topographic slope; watersheds; Japan
Abstract:
... Large-scale sediment supply events (LSEs) cause not only a sudden increase in sediment discharge immediately after their occurrence, but also a long-term condition of elevated sediment yield. In Japan, many LSEs, triggered by heavy rainfall or earthquakes have created high risks for sediment-related disaster. However, the difference between sediment dynamics following a LSE triggered by rainfall a ...
DOI:
10.1016/j.geomorph.2020.107301

22. Characteristics of suspended sediment and river discharge during the beginning of snowmelt in volcanically active mountainous environments

Author:
Goro Mouri; Faizah Che Ros; Sergey Chalov
Source:
Geomorphology 2014 v.213 pp. 266-276
ISSN:
0169-555X
Subject:
adsorption; climate; halloysite; hydrogen; laboratory experimentation; landscapes; mountains; mud flows; oxygen; particle size; phosphates; porosity; rivers; sediment transport; sediments; snowmelt; stable isotopes; stream flow; surface water; suspended sediment; temporal variation; topographic slope; watersheds; Japan; Malaysia; Russia
Abstract:
... To better understand instream suspended sediment delivery and transformation processes, we conducted field measurements and laboratory experiments to study the natural function of spatial and temporal variation, sediment particles, stable isotopes, particle size, and aspect ratio from tributary to mainstream flows of the Sukhaya Elizovskaya River catchment at the beginning of and during snowmelt. ...
DOI:
10.1016/j.geomorph.2014.02.001

23. Chlorinated Polycyclic Aromatic Hydrocarbons in Sediments from Industrial Areas in Japan and the United States

Author:
Horii, Yuichi; Ohura, Takeshi; Yamashita, Nobuyoshi; Kannan, Kurunthachalam
Source:
Archives of environmental contamination and toxicology 2009 v.57 no.4 pp. 651-660
ISSN:
0090-4341
Subject:
Mytilus edulis; air; dioxins; industrialization; lipids; mass spectrometry; mussels; parents; pollutants; polycyclic aromatic hydrocarbons; rivers; sediments; surface water; toxicity; waste incineration; watersheds; Georgia; Japan; Massachusetts; Michigan
Abstract:
... Chlorinated polycyclic aromatic hydrocarbons (ClPAHs) are widespread environmental pollutants in the urban environment. Nevertheless, there is little information available regarding the occurrence and profiles of ClPAHs in environmental matrices. In this study, residual concentrations and profiles of 20 individual ClPAHs and 16 US EPA-priority PAHs were determined using high- resolution gas chroma ...
DOI:
10.1007/s00244-009-9372-1
PubMed:
19672646

24. Coastal changes in the Sendai area from the impact of the 2011 Tōhoku-oki tsunami: Interpretations of time series satellite images, helicopter-borne video footage and field observations

Author:
David R. Tappin; Hannah M. Evans; Colm J. Jordan; Bruce Richmond; Daisuke Sugawara; Kazuhisa Goto
Source:
Sedimentary geology 2012 v.282 no. pp. 151-174
ISSN:
0037-0738
Subject:
coasts; remote sensing; rivers; sea level; sediments; time series analysis; tsunamis; Japan
Abstract:
... A combination of time-series satellite imagery, helicopter-borne video footage and field observation is used to identify the impact of a major tsunami on a low-lying coastal zone located in eastern Japan. A comparison is made between the coast protected by armoured ‘engineered’ sea walls and the coast without. Changes are mapped from before and after imagery, and sedimentary processes identified f ...
DOI:
10.1016/j.sedgeo.2012.09.011

25. Coastal erosion and shore protection: A brief historical analysis

Author:
Enzo Pranzini
Source:
Journal of coastal conservation 2018 v.22 no.5 pp. 827-830
ISSN:
1400-0350
Subject:
clay; coastal plains; coasts; concrete; deforestation; human development; humans; resorts; river deltas; rivers; sea level; sediments; stream channels; subsidence; tourists; wetlands; wood; China; Japan; Yellow River
Abstract:
... Since the Neolithic, humans have gathered along coastal plains, where they had to face sea level rise and subsidence without the technology to oppose these processes. When sea level stabilized, approx. 6.000 yr. B.P., coastal colonization was allowed, but where mountain deforestation was carried out river sediment input increased tremendously: settlements were disconnected from the shore and harbo ...
DOI:
10.1007/s11852-017-0521-9

26. Comparing the 87Sr/86Sr of the bulk and exchangeable fractions in stream sediments: Implications for 87Sr/86Sr mapping in provenance studies

Author:
Yuka Jomori; Masayo Minami; Akiko Sakurai-Goto; Atsuyuki Ohta
Source:
Applied geochemistry 2017 v.86 pp. 70-83
ISSN:
0883-2927
Subject:
animals; bedrock; food production; geochemistry; isotopes; particle size; plagioclase; provenance; rivers; sedimentary rocks; sediments; streams; strontium; watersheds; Japan
Abstract:
... We are preparing a nationwide distribution map of strontium isotope ratio (⁸⁷Sr/⁸⁶Sr) in Japan, using stream sediment to obtain basic ⁸⁷Sr/⁸⁶Sr data for the provenance analysis of food production and archaeological substances. To clarify the effect of particle size on ⁸⁷Sr/⁸⁶Sr in stream sediments, we analyzed stream sediment from the Shigenobu River system in Matsuyama, Ehime Prefecture, Japan, w ...
DOI:
10.1016/j.apgeochem.2017.09.004

27. Concentration and degradation of alternative biocides and an insecticide in surface waters and their major sinks in a semi-enclosed sea, Japan

Author:
Chikumbusko Chiziwa Kaonga; Kazuhiko Takeda; Hiroshi Sakugawa
Source:
Chemosphere 2016 v.145 pp. 256-264
ISSN:
0045-6535
Subject:
antifouling agents; atmospheric deposition; biocides; biodegradation; boats; diuron; fenitrothion; fish; half life; models; photolysis; plankton; rivers; seawater; sediments; ships; surface water; Japan
Abstract:
... A mass distribution model was used to predict the fate of Diuron, Irgarol 1051 and Fenitrothion in Seto Inland Sea which is located in western Japan. This was done by using concentration, degradation, and literature data. Diuron and Irgarol 1051 in Seto Inland Sea are mainly derived from antifouling paints used for ships and boats. On the other hand Fenitrothion exclusively comes from land via riv ...
DOI:
10.1016/j.chemosphere.2015.11.100

28. Data-driven analysis for source apportionment and geochemical backgrounds establishment of toxic elements and REEs in the Tohoku region, Japan

Author:
Arie Pujiwati; Jiajie Wang; Kengo Nakamura; Yoshishige Kawabe; Noriaki Watanabe; Takeshi Komai
Source:
Chemosphere 2021 v.263 pp. 128268
ISSN:
0045-6535
Subject:
Japan; anthropogenic activities; databases; mineralization; principal component analysis; rare earth elements; rivers; sediments; toxicity
Abstract:
... The Tohoku region of Japan is geologically diverse, with a long agriculture and mining history; however, little information about the origins and distribution mechanisms of elements in this region has been reported. This study aims to provide fundamental insights into the effects of geological features and anthropogenic activities on various elements, including toxic elements and rare-earth elemen ...
DOI:
10.1016/j.chemosphere.2020.128268

29. Defluorination of perfluoroalkyl acids is followed by production of monofluorinated fatty acids

Author:
Vladimir P. Beškoski; Atsushi Yamamoto; Takeshi Nakano; Katsuya Yamamoto; Chisato Matsumura; Mamoru Motegi; Latinka Slavković Beškoski; Hideyuki Inui
Source:
Science of the total environment 2018 v.636 pp. 355-359
ISSN:
0048-9697
Subject:
bacteria; biomass; biotransformation; fatty acids; hydrocarbons; metabolites; molds (fungi); perfluorooctane sulfonic acid; perfluorooctanoic acid; pollutants; pollution; rivers; sediments; sorption; yeasts; Japan
Abstract:
... We investigated the capability of microorganisms isolated from environments polluted with perfluoroalkyl acids (PFAAs) to conduct biotransformation of these emerging pollutants. Two different microbial consortia (chemoorganoheterotrophic bacteria and total yeast and molds) were isolated from two river sediments in Saitama and Osaka, Japan, known for long term pollution with perfluorooctane sulfoni ...
DOI:
10.1016/j.scitotenv.2018.04.243

30. Difference in timing of maximum flooding in two adjacent lowlands in the Tokyo area caused by the difference in sediment supply rate

Author:
Junko Komatsubara; Yoshiro Ishihara; Rei Nakashima; Masao Uchida
Source:
Quaternary international 2017 v.455 pp. 56-69
ISSN:
1040-6182
Subject:
lowlands; rivers; sediments; shorelines; stratigraphy; transgressive segregation; Japan
Abstract:
... The Arakawa incised-valley fill beneath the Tokyo area, Japan, has formed by delta progradation during Holocene transgression and highstand. This paper presents the integrated stratigraphy of this valley fill as deduced from three continuous sediment cores with rich radiocarbon age control and abundant data from the surrounding, and compares the filling history with the adjacent Nakagawa valley.Si ...
DOI:
10.1016/j.quaint.2017.06.006

31. Dissolved and Particulate Organic Matter Dynamics Relative to Sediment Resuspension Induced by the Tidal Cycle in Macrotidal Estuaries, Kyushu, Japan

Author:
Hiroyuki Takasu; Koji Uchino; Koichiro Mori
Source:
Water 2020 v.12 no.9 pp. -
ISSN:
2073-4441
Subject:
Japan; fluorescence; organic nitrogen; particulate organic carbon; riparian areas; rivers; salinity; sediments; turbidity; water
Abstract:
... The tide-induced resuspension of sediments plays important roles in the efflux of particulate organic carbon (POC) from rivers to the coastal sea. Although dissolved organic carbon (DOC) comprises more than half of the riverine flux of organic carbon to the ocean, the influence of sediment resuspension induced by the tidal cycle on DOC dynamics is largely unknown. This study examined the dynamics ...
DOI:
10.3390/w12092561

32. Dissolved oxygen concentration in river sediment of the Lake Biwa tributaries, Japan

Author:
Yoshihiro Yamada; Yugo Mito; Akitake Igeta; Eitaro Wada
Source:
Limnology 2012 v.13 no.1 pp. 149-154
ISSN:
1439-8621
Subject:
dissolved oxygen; lakes; paddies; rivers; sediments; surface water; water flow; Japan
Abstract:
... The dissolved oxygen concentration in the sediment pore water downstream of rivers in the Lake Biwa basin was measured, and the factors affecting the dissolved oxygen concentration were analyzed. In August 2003, nine rivers (Sakai, Nakanoi, Hebisuna, Anziki, Yasu, Echi, Ane, Oh, and Ohura) were surveyed. The dissolved oxygen was depleted in the sediment pore water of the rivers with a high proport ...
DOI:
10.1007/s10201-011-0348-2

33. Distribution and transfer of naturally occurring radionuclides and 137Cs in the freshwater system of the Plitvice Lakes, Croatia, and related dose assessment to wildlife by ERICA Tool

Author:
Božena Skoko; Dinko Babić; Zdenko Franić; Tomislav Bituh; Branko Petrinec
Source:
Environmental science and pollution research international 2021 v.28 no.18 pp. 23547-23564
ISSN:
0944-1344
Subject:
Japan; accidents; cesium radioisotopes; fish; freshwater; lakes; national parks; pollution; radioactivity; radium; research; risk; rivers; sediments; uncertainty; water activity; water distribution; wildlife; Croatia
Abstract:
... The aim of this study was to investigate the natural radioactivity of Plitvice Lakes, under the assumption that due to its status as a National Park, the area can be considered an example of a natural freshwater system. Also, considering the transfer parameter data as the largest source of uncertainty in radiological risk assessments, the impact of site-specific data on dose rate assessment, as op ...
DOI:
10.1007/s11356-021-12415-w

34. Distribution characteristics and source identification of polychlorinated dibenzo-p-dioxin and dibenzofurans, and dioxin-like polychlorinated biphenyls in the waters from River Kanzaki, running through Osaka urban area, Japan

Author:
Masao Kishida
Source:
Journal of Environmental Sciences 2013 v.25 pp. 441-451
ISSN:
1001-0742
Subject:
World Health Organization; dibenzofuran; incinerators; industrial wastes; pollution; polychlorinated biphenyls; polychlorinated dibenzodioxins; polychlorinated dibenzofurans; river water; rivers; sampling; sediments; solid wastes; urban areas; waterways; Japan
Abstract:
... This is the first to elucidate the distribution and sources of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/PCDFs), and dioxin-like polychlorinated biphenyls in the waters from Kanzaki River, which is one of the most heavily polluted rivers in Japan. The World Health Organization (WHO)-toxic equivalent quantities (TEQs) in waters from the mainstream exceeded the Japanese environmental ...
DOI:
10.1016/S1001-0742(12)60091-6

35. Distribution of Metals in Surface Sediments from a Small River Flowing Through Urban and Agricultural Areas

Author:
Yuri Igari; Takaaki Tamura; Masaki Ohno; Kazuyuki Suzuki; Tomohiro Kose; Kuniaki Kawata
Source:
Bulletin of environmental contamination and toxicology 2012 v.89 no.4 pp. 770-774
ISSN:
0007-4861
Subject:
metals; rivers; sediment contamination; sediments; Japan
Abstract:
... The characteristic distributions of 12 metals (Al, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Cd and Pb) were investigated in surface sediments from a small river (Niitsu River) flowing through both urban and agricultural areas by comparison with those from the upper main stream (Nodai River). Among the investigated metals, the mean concentrations of Al, Cr, Fe, Zn, Cd and Pb in the Niitsu River were sig ...
DOI:
10.1007/s00128-012-0797-2
PubMed:
22918321

36. Distribution of Polycyclic Aromatic Hydrocarbons and n-Alkanes in Surface Sediments from Shinano River, Japan

Author:
Hori, Tomiyuki; Shiota, Naoya; Asada, Takashi; Oikawa, Kikuo; Kawata, Kuniaki
Source:
Bulletin of environmental contamination and toxicology 2009 v.83 no.3 pp. 455-461
ISSN:
0007-4861
Subject:
alkanes; carbon; cluster analysis; polycyclic aromatic hydrocarbons; rivers; sediments; Japan
Abstract:
... The distribution of polycyclic aromatic hydrocarbons (PAHs) and n-alkanes was investigated in the surface sediment from the Shinano River in Niigata, Japan. The total concentrations of the PAHs and n-alkanes ranged from 102 to 10,450 ng/g dry weight and from 160 to 3,530 ng/g dry, respectively. Perylene (Per) in the sediment samples originated from both the same anthropogenic sources as benzo[a]py ...
DOI:
10.1007/s00128-009-9743-3
PubMed:
19424650

37. Distribution of freshwater macroinvertebrates in streams with dams and associated reservoirs on a subtropical oceanic island off southern Japan

Author:
Kiyoshi Satake; Ryuhei Ueno
Source:
Limnology 2013 v.14 no.2 pp. 211-221
ISSN:
1439-8621
Subject:
Crustacea; cluster analysis; ecosystems; extinction; fauna; freshwater; habitats; indigenous species; introduced species; islands; macroinvertebrates; oxygen; rivers; sediments; streams; surveys; Japan; Pacific Ocean
Abstract:
... The conservation of endemic fauna in freshwater ecosystems is a topical issue on small oceanic islands. Because these endemics have limited distributions, they are more vulnerable to extinction. This study is the first to clarify the distribution of freshwater macroinvertebrates including endemic and alien species in streams with dams and associated reservoirs on the Ogasawara Islands in the north ...
DOI:
10.1007/s10201-012-0393-5

38. Distribution of six anticancer drugs and a variety of other pharmaceuticals, and their sorption onto sediments, in an urban Japanese river

Author:
Takashi Azuma; Natsumi Arima; Ai Tsukada; Satoru Hirami; Rie Matsuoka; Ryogo Moriwake; Hirotaka Ishiuchi; Tomomi Inoyama; Yusuke Teranishi; Misato Yamaoka; Mao Ishida; Kanae Hisamatsu; Ayami Yunoki; Yoshiki Mino
Source:
Environmental science and pollution research international 2017 v.24 no.23 pp. 19021-19030
ISSN:
0944-1344
Subject:
azithromycin; genistein; glycitein; laboratory experimentation; rivers; sediments; sorption; surveys; tamoxifen; theophylline; Japan
Abstract:
... The distributions of 31 pharmaceuticals grouped into nine therapeutic classes, including six anticancer drugs, were investigated in the waters and sediments of an urban river in Japan. The coefficients of sorption (logK d) to the river sediments were also determined from the results of a field survey and laboratory-scale experiment. Three anticancer drugs—bicalutamide, doxifluridine, and tamoxifen ...
DOI:
10.1007/s11356-017-9525-0

39. Diversity and functions of bacterial communities in water and sediment from the watershed of the Tama River flowing a highly urbanized area

Author:
Nanami Mizusawa; Md. Shaheed Reza; Chiharu Oikawa; Satomi Kuga; Mariko Iijima; Atsushi Kobiyama; Yuichiro Yamada; Yuri Ikeda; Daisuke Ikeda; Kazuho Ikeo; Shigeru Sato; Takehiko Ogata; Toshiaki Kudo; Mitsuru Jimbo; Ko Yasumoto; Naoto Urano; Shugo Watabe
Source:
Fisheries science 2021 v.87 no.5 pp. 697-715
ISSN:
0919-9268
Subject:
Bacteroides; Flavobacterium; Japan; Mycobacterium; Pseudomonas; alpha-Proteobacteria; beta-Proteobacteria; genes; metabolism; metagenomics; river water; rivers; sediments; sulfur; taxonomy; urbanization; virulence; watersheds
Abstract:
... Bacterial communities are important factors governing changes in river ecology. We evaluated the diversity of bacterial communities in sediment and size-fractionated water samples collected from the Tama River, Tokyo, Japan, to verify their taxonomy and functional classes. Samples were collected from three river areas, namely up-, mid- and downstream, and analyzed using MiSeq shotgun metagenomic s ...
DOI:
10.1007/s12562-021-01543-4

40. Dominating factors influencing rapid meander shift and levee breaches caused by a record-breaking flood in the Otofuke River, Japan

Author:
Tomoko Kyuka; Kazunori Okabe; Yasuyuki Shimizu; Satomi Yamaguchi; Kazuyoshi Hasegawa; Kho Shinjo
Source:
Journal of hydro-environment research 2020 v.31 pp. 76-89
ISSN:
1570-6443
Subject:
Japan; bank erosion; research; riparian areas; rivers; sediment transport; sediments; surveys; typhoons; vegetation
Abstract:
... The Otofuke River is a tributary of the Tokachi River, Hokkaido Japan, consisting of a channelized reach with a steep slope and a relatively large designed width. In August 2016, the river witnessed four major flooding events with a record-breaking discharge within a time span of 15 days. The Otofuke River originally had a straight channelized reach. However, because of a series of flooding events ...
DOI:
10.1016/j.jher.2020.05.003

41. Dynamic Modelling of Soil Nitrogen Budget and Vegetation Colonization in Sediment Bars of a Regulated River

Author:
T. Asaeda; M. H. Rashid; R. Abu Bakar
Source:
River research and applications 2015 v.31 no.4 pp. 470-484
ISSN:
1535-1459
Subject:
herbs; dynamic models; trees; Robinia pseudoacacia; soil nutrient balance; sediments; nitrogen content; flood control; Salix; hydrology; ecosystems; simulation models; soil; biomass; vegetative growth; tree growth; rivers; landscapes; nitrogen; herbaceous plants; environmental factors; vegetation; Japan
Abstract:
... Intensive forestation widely occurs in East Asian rivers. It deteriorates the ecosystem of gravelly or sandy bars, affects flood protection, and changes the landscape of the river. For the regulation of forestation and vegetative succession on the bars, a suitable tool, through either a numerical simulation model or through empirical knowledge that will predict the future process after treatment, ...
DOI:
10.1002/rra.2802

42. Ecological risks of insecticide contamination in water and sediment around off-farm irrigated rice paddy fields

Author:
Shunsuke Furihata; Atsushi Kasai; Kazumasa Hidaka; Makihiko Ikegami; Hitoshi Ohnishi; Koichi Goka
Source:
Environmental pollution 2019 v.251 pp. 628-638
ISSN:
0269-7491
Subject:
acute toxicity; aquatic organisms; biodiversity; dinotefuran; environmental assessment; environmental impact; fipronil; irrigation; paddies; pesticide application; risk; risk assessment; rivers; sediments; surface water; Japan
Abstract:
... The ecological impacts of insecticides in aquatic areas around agricultural lands have long been ignored in the regulation scheme of pesticides in Japan. Upon the scheme, the predicted concentration of an insecticide in the main stream of a river is the only parameter considered, suggesting that the ecological impacts of insecticides on local biodiversity around agricultural fields are underestima ...
DOI:
10.1016/j.envpol.2019.05.009

43. Effect of floods on the growth of Phragmites japonica on the sediment bar of regulated rivers: a modelling approach

Author:
Takashi Asaeda; Mahendra B. Baniya; Md H. Rashid
Source:
International journal of river basin management 2011 v.9 no.3-4 pp. 211-220
ISSN:
1814-2060
Subject:
Phragmites; biomass; environmental factors; floods; growth models; habitats; nutrients; photosynthates; rivers; sediments; shoots; soil; Japan
Abstract:
... Growth patterns of Phragmites japonica associated with soil characteristics were observed at the sediment bar of the Arakawa River, Japan. Accumulating fine sediments on the bar altered the habitat condition and made it accessible for the growth of P. japonica. The total biomass of the P. japonica shoots was higher in the fine sediments probably due to the better availability of moisture and nutri ...
DOI:
10.1080/15715124.2011.613837

44. Effect of neap-spring hydrodynamics on salt and suspended sediment transport in multi-branched urban estuaries

Author:
Joan Cecilia Casila; Victor Ella; Katsuhide Yokoyama
Source:
Science of the total environment 2019 v.694 pp. 133653
ISSN:
0048-9697
Subject:
combined sewer systems; dissolved oxygen; estuaries; freshwater; hydrodynamics; hypoxia; nutrients; odors; oxygen; particulate organic matter; rivers; salinity; sediment transport; sediments; suspended sediment; tides; turbidity; water quality; Japan
Abstract:
... Unique neap and spring tide hydrodynamic features were studied in the estuarine areas of multi-branched urban rivers in Tokyo, Japan. Intensive measurements of salinity, turbidity, dissolved oxygen, velocity, particulate organic matter (POM), and nutrients were conducted for 13h in five stations simultaneously on July 3 and July 11, 2017. Water sampling, analysis and calculations of salt and sedim ...
DOI:
10.1016/j.scitotenv.2019.133653

45. Effects of Variations in Cadmium and Lead Levels in River Sediments on Local Foods and Body Burden of Local Residents in Non-Polluted Areas in Japan

Author:
Ikeda, Masayuki; Watanabe, Takao; Ohashi, Fumiko; Shimbo, Shinichiro
Source:
Biological trace element research 2010 v.133 no.3 pp. 255-264
ISSN:
0163-4984
Subject:
blood; brown rice; cadmium; databases; exposure pathways; foods; lead; rivers; sediments; stream channels; urine; Japan
Abstract:
... This study was initiated to examine if variations in the concentrations of cadmium (Cd) and lead (Pb) in water environment may affect metal levels in local foods and body burden of local residents in non-polluted areas in Japan. Two nationwide databases have been made available on concentrations of Cd in locally harvested brown rice and of Cd and Pb in sediments in local river beds. These data wer ...
DOI:
10.1007/s12011-009-8436-4
PubMed:
19547930

46. Effects of Zostera marina on the patterns of spatial distribution of sediments and macrozoobenthos in the boreal lagoon of Furen (Hokkaido, Japan)

Author:
P. Magni; S. Como; A. Kamijo; S. Montani
Source:
Marine environmental research 2017 v.131 pp. 90-102
ISSN:
0141-1136
Subject:
Crustacea; Zostera marina; acid volatile sulfides; carbon; chlorophyll; coastal water; estuaries; eutrophication; habitats; molluscs; nitrogen content; rivers; seagrasses; sediments; spatial variation; variance; Japan
Abstract:
... Understanding patterns of spatial variations in benthic seagrass assemblages is a central issue in seagrass ecology. However, how patterns of spatial variations in macrozoobenthos and associated sediments differ between vegetated and unvegetated areas remain largely unexplored. In the present study, two different habitats represented by dense Zostera marina beds (Zostera) and unvegetated sediments ...
DOI:
10.1016/j.marenvres.2017.09.013

47. Effects of episodic sediment supply on bedload transport rate in mountain rivers. Detecting debris flow activity using continuous monitoring

Author:
Taro Uchida; Wataru Sakurai; Takuma Iuchi; Hiroaki Izumiyama; Lisa Borgatti; Gianluca Marcato; Alessandro Pasuto
Source:
Geomorphology 2018 v.306 pp. 198-209
ISSN:
0169-555X
Subject:
acoustics; bedload; disasters; floods; geophysics; hazard characterization; land use planning; landscapes; microphones; monitoring; mud flows; rivers; sediments; storms; topographic slope; watersheds; Japan
Abstract:
... Monitoring of sediment transport from hillslopes to channel networks as a consequence of floods with suspended and bedload transport, hyperconcentrated flows, debris and mud flows is essential not only for scientific issues, but also for prevention and mitigation of natural disasters, i.e. for hazard assessment, land use planning and design of torrent control interventions. In steep, potentially u ...
DOI:
10.1016/j.geomorph.2017.12.040

48. Effects of forest litter on dissolved 137Cs concentrations in a highly contaminated mountain river in Fukushima

Author:
Seiji Hayashi; Hideki Tsuji; Ishii Yumiko
Source:
Journal of hydrology 2022 v.41 pp. 101099
ISSN:
2214-5818
Subject:
Japan; accidents; base flow; cesium radioisotopes; dissolved organic carbon; forest litter; forested watersheds; nuclear power; potassium; power plants; riparian soils; river water; rivers; runoff; sediments; storms; water quality
Abstract:
... The upper, forested reaches of the Ota River, 24.4 km northwest of the Fukushima Daiichi nuclear power plant, was studied. There is concern about the effects of dissolved radiocesium (¹³⁷Cs) released from forest litter on long-term contamination of aquatic ecosystems caused by the Fukushima nuclear accident. Therefore, hydrology and water quality measurements were performed under base flow and sto ...
DOI:
10.1016/j.ejrh.2022.101099

49. Effects of sediment bypass tunnels on grain size distribution and benthic habitats in regulated rivers

Author:
Christian Auel; Sohei Kobayashi; Yasuhiro Takemon; Tetsuya Sumi
Source:
International journal of river basin management 2017 v.15 no.4 pp. 433-444
ISSN:
1814-2060
Subject:
geomorphology; invertebrates; microhabitats; particle size distribution; rivers; sedentary species; sediments; Japan; Switzerland
Abstract:
... Four dams in Japan and Switzerland with Sediment Bypass Tunnels (SBT) as a measure against reservoir sedimentation were monitored to analyse the effects of sediment supply on the downstream environment based on up- to downstream differences in geomorphological and biological characteristics. SBT operation times ranged from 93 years at Pfaffensprung and 17 at Asahi to only three years at Solis and ...
DOI:
10.1080/15715124.2017.1360320

50. Effects of the burrowing mud shrimp, Upogebia yokoyai, on carbon flow and microbial activity on a tidal flat

Author:
Akiko Sasaki; Hiroki Nakao; Shinpei Yoshitake; Takayuki Nakatsubo
Source:
Ecological research 2014 v.29 no.3 pp. 493-499
ISSN:
0912-3814
Subject:
burrows; carbon; carbon dioxide; community structure; estuaries; fatty acids; microbial activity; microbial biomass; physicochemical properties; rivers; sediments; shrimp; water content; Japan
Abstract:
... Mud shrimps, Upogebia spp., are major constituents of macrobenthic communities in tidal flats in Japan. The impact of Upogebia yokoyai on carbon flow on tidal flats was examined by comparing CO₂emission rates from plots with and without burrows in the Kurose River estuary, Japan. In situ CO₂emission rates from plots with burrows were significantly higher than from those without. Laboratory measure ...
DOI:
10.1007/s11284-014-1149-y

51. Environmental assessment of fate, transport and persistent behavior of dichlorodiphenyltrichloroethanes and hexachlorocyclohexanes in land and water ecosystems

Author:
G. Ahmed; H. M. Anawar; D. T. Takuwa; I. T. Chibua; G. S. Singh; K. Sichilongo
Source:
International journal of environmental science and technology 2015 v.12 no.8 pp. 2741-2756
ISSN:
1735-1472
Subject:
HCH (pesticide); agricultural runoff; binding capacity; bioaccumulation; cattle; ecosystems; environmental assessment; fish; humans; hydrophobicity; isomers; lakes; metabolites; mutagenicity; public health; risk; rivers; sediments; soil; wastewater; wildlife; Australia; China; Japan
Abstract:
... Many studies have investigated the contamination level, spatial distribution, sources, chiral signals, and potential ecological and public health risks of dichlorodiphenyltrichloroethanes, its metabolites and the isomers of hexachlorocyclohexane in the environment. This study presents a critical review to provide updated knowledge about the fate, persistence, long-range transport and toxicity effe ...
DOI:
10.1007/s13762-015-0792-3

52. Environmental change of the fluvial-estuary system in relation to Arase Dam removal of the Yatsushiro tidal flat, SW Kyushu, Japan

Author:
Sansfica M. Young; Hiroaki Ishiga
Source:
Environmental earth sciences 2014 v.72 no.7 pp. 2301-2314
ISSN:
1866-6280
Subject:
Bacillariophyta; arsenic; chemical composition; heavy metals; lead; marine environment; quartz; rivers; sediment transport; sediments; sulfur; suspended sediment; zinc; Japan
Abstract:
... Chemical composition of 24 elements for sediments and suspended solids, water parameters and the diatoms from Yatsushiro Bay tidal flat, Kuma River, and Arase Dam have been determined to examine changes from 2002 to 2013. In 2002, sediment delivered to the bay by the Kuma River was restricted by the Arase Dam; however, in April 2010 two gates were opened and also repeated seasonal flushing allowin ...
DOI:
10.1007/s12665-014-3139-3

53. Environmental gradients determining the distribution of benthic macroinvertebrates in Lake Takkobu, Kushiro wetland, northern Japan

Author:
Takamura, Noriko; Ito, Tomiko; Ueno, Ryuhei; Ohtaka, Akifumi; Wakana, Isamu; Nakagawa, Megumi; Ueno, Youichi; Nakajima, Hirotsugu
Source:
Ecological research 2009 v.24 no.2 pp. 371-381
ISSN:
0912-3814
Subject:
sediments; Tubifex tubifex; interspecific variation; wetlands; rivers; community structure; lakes; organic matter; Coix; environmental factors; submerged aquatic plants; pH; species diversity; Chironomus; biomass; vegetation; macroinvertebrates; Japan
Abstract:
... Effects of environmental variables on the distribution of benthic macroinvertebrates inhabiting sediments were studied at 25 sites along the shoreline of Lake Takkobu in the Kushiro wetland of northern Japan in summer 2003. During the last decade, the lake's status has undergone a drastic shift from clear water dominated by submerged macrophytes to turbid water dominated by phytoplankton. The cano ...
DOI:
10.1007/s11284-008-0514-0

54. Evaluating the Contribution of Long-Range Transport of Heavy Metals from the Asian Continent to Their Concentrations in Sediment Cores from Lake Shinji, Western Japan

Author:
Kenji Kusunoki; Masahiro Sakata; Yukinori Tani; Yasushi Seike; Kazuyasu Ayukawa
Source:
Water, air, and soil pollution 2012 v.223 no.3 pp. 1151-1160
ISSN:
0049-6979
Subject:
air; effluents; heavy metals; history; isotopes; lakes; lead; rain; rivers; sediment contamination; sediments; watersheds; China; Japan; Russia; South Korea
Abstract:
... The historical trend of heavy metal pollution recorded in sediment cores from Lake Shinji, western Japan, was investigated to evaluate the contribution of increasing long-range transport of heavy metals from the Asian continent in recent years. The concentrations of Cd, Co, Cr, Cu, Ni, Pb, Sb, and Zn and lead isotope ratios were determined for sediment cores collected at two sites in the lake. Amo ...
DOI:
10.1007/s11270-011-0932-4

55. Evaluation of sediment and 137Cs redistribution in the Oginosawa River catchment near the Fukushima Dai-ichi Nuclear Power Plant using integrated watershed modeling

Author:
Kazuyuki Sakuma; Alex Malins; Hironori Funaki; Hiroshi Kurikami; Tadafumi Niizato; Takahiro Nakanishi; Koji Mori; Kazuhiro Tada; Takamaru Kobayashi; Akihiro Kitamura; Masaaki Hosomi
Source:
Journal of environmental radioactivity 2018 v.182 pp. 44-51
ISSN:
0265-931X
Subject:
autumn; cesium; decontamination; exports; forests; hydrologic models; monitoring; nuclear power; paddies; power plants; radioactivity; radionuclides; rain; ravines; river water; rivers; sediment yield; sediments; topsoil; watersheds; Japan
Abstract:
... The Oginosawa River catchment lies 15 km south-west of the Fukushima Dai-ichi nuclear plant and covers 7.7 km². Parts of the catchment were decontaminated between fall 2012 and March 2014 in preparation for the return of the evacuated population. The General-purpose Terrestrial Fluid-flow Simulator (GETFLOWS) code was used to study sediment and ¹³⁷Cs redistribution within the catchment, including ...
DOI:
10.1016/j.jenvrad.2017.11.021

56. Export of radioactive cesium from agricultural fields under simulated rainfall in Fukushima

Author:
Phong K. Thai; Yuma Suka; Masaru Sakai; Kazuki Nanko; Jui-Hung Yen; Hirozumi Watanabe
Source:
Environmental science 2015 v.17 no.6 pp. 1157-1163
ISSN:
2050-7895
Subject:
agricultural land; agricultural soils; cesium; inventories; losses from soil; polluted soils; radioactivity; radionuclides; rain; rainfall simulation; risk; rivers; runoff; sediments; soil erosion; soil pollution; Japan
Abstract:
... In this study, we investigated the impact of rainfall on runoff, soil erosion and consequently on the discharge of radioactive cesium in agricultural fields in Fukushima prefecture using a rainfall simulator. Simulated heavy rainfalls (50 mm h⁻¹) generated significant runoff and soil erosion. The average concentration of radioactive cesium (the sum of ¹³⁴Cs and ¹³⁷Cs) in the runoff sediments was ∼ ...
DOI:
10.1039/c5em00063g

57. Factors Controlling the Fractionation and Seasonal Mobility Variations of Ga and In in Systems Impacted by Acidic Thermal Waters: Effects of Thermodynamics and Bacterial Activity

Author:
Yasumasa Ogawa; Daizo Ishiyama; Naotatsu Shikazono; Koichi Suto; Chihiro Inoue; Noriyoshi Tsuchiya; Bernhardt Saini-Eidukat; Scott A. Wood
Source:
Aquatic geochemistry 2018 v.24 no.1 pp. 5-25
ISSN:
1380-6165
Subject:
algorithms; bacteria; chlorides; ferric oxide; fractionation; geochemistry; hydrolysis; ions; lakes; metals; microbial activity; mixing; neutralization; pH; rivers; seasonal variation; sediments; snowmelt; sorption; streams; sulfates; thermodynamics; water temperature; watersheds; Japan
Abstract:
... This work assessed both the fractionation and the seasonal mobility variations of Ga and In in systems impacted by acidic thermal waters. This was accomplished by performing thermodynamic calculations using the PHREEQC algorithm and by assessing the activity of acidophilic iron-oxidizing bacteria. The pH of the Kusatsu thermal waters in Gunma Prefecture, central Japan, is rapidly increased followi ...
DOI:
10.1007/s10498-018-9328-z

58. Fate and behavior of herbicides, butachlor, CNP, chlomethoxynil, and simetryne in river water, shellfish, and sediments of the Ishikari River

Author:
Ohyama, T.; Jin, K.; Katoh, Y.; Chiba, Y.; Inoue, K.
Source:
Bulletin of environmental contamination and toxicology 1987 v.39 no.4 pp. 555-562
ISSN:
0007-4861
Subject:
sediments; effluents; rivers; butachlor; simetryn; shellfish; Japan
DOI:
10.1007/BF01698445
PubMed:
3689986

59. Fukushima fallout in Northwest German environmental media

Author:
Daniela Pittauerová; Bernd Hettwig; Helmut W. Fischer
Source:
Journal of environmental radioactivity 2011 v.102 no.9 pp. 877-880
ISSN:
0265-931X
Subject:
Japan; accidents; air; cesium radioisotopes; grasses; instrumentation; milk; radioactivity; rain; rivers; sediments; soil; Germany
Abstract:
... Traces of short- and long-lived fallout isotopes (¹³¹I, ¹³⁴Cs and ¹³⁷Cs) were found in environmental samples collected in Northwest Germany (rain water, river sediment, soil, grass and cow milk) from March to May 2011, following the radioactivity releases after the nuclear accident in Fukushima, Japan. The measured concentrations are consistent with reported concentrations in air, amount of rainfa ...
DOI:
10.1016/j.jenvrad.2011.06.003

60. Geochemical distribution and fate of arsenic in water and sediments of rivers from the Hokusetsu area, Japan

Author:
Emilie Even; Harue Masuda; Takahiro Shibata; Aki Nojima; Yusuke Sakamoto; Yusuke Murasaki; Hitoshi Chiba
Source:
Journal of hydrology 2017 v.9 pp. 34-47
ISSN:
2214-5818
Subject:
adsorption; aluminum; arsenic; iron; manganese; river water; rivers; sedimentary rocks; sediments; sulfates; sulfides; sulfur; volcanic activity; Japan
Abstract:
... Hokusetsu Region in Osaka, Japan.The As contamination was investigated through the geochemical mapping and analysis of river waters and bed sediments over an area of 440km2. Sulfur from sulfides in rocks and dissolved sulfates in water were compared via isotopic analysis to assess their origin and the subsequently released As. The fate of As (transport, binding on settling particles) was evaluated ...
DOI:
10.1016/j.ejrh.2016.09.008

61. Geomesophilobacter sediminis gen. nov., sp. nov., Geomonas propionica sp. nov. and Geomonas anaerohicana sp. nov., three novel members in the family Geobacterecace isolated from river sediment and paddy soil

Author:
Zhengcheng Zhang; Zhenxing Xu; Yoko Masuda; Xueding Wang; Natsumi Ushijima; Yutaka Shiratori; Keishi Senoo; Hideomi Itoh
Source:
Systematic and applied microbiology 2021 v.44 no.5 pp. 126233
ISSN:
0723-2020
Subject:
Geobacteraceae; Japan; acetates; agar; amino acids; chemotaxonomy; citrates; ferrihydrite; fumarates; genes; glucose; new genus; nitrates; nucleic acid hybridization; paddies; paddy soils; phylogeny; propionic acid; pyruvic acid; rivers; sediments
Abstract:
... Bacteria in the family Geobacteraceae have been proven to fill important niches in a diversity of anaerobic environments and global biogeochemical processes. Here, three bacterial strains in this family, designated Red875ᵀ, Red259ᵀ, and Red421ᵀ were isolated from river sediment and paddy soils in Japan. All of them are Gram-staining-negative, strictly anaerobic, motile, flagellum-harboring cells t ...
DOI:
10.1016/j.syapm.2021.126233

62. Georeferenced multimedia environmental fate of volatile methylsiloxanes modeled in the populous Tokyo Bay catchment basin

Author:
Takeo Sakurai; Yoshitaka Imaizumi; Keisuke Kuroda; Takehiko I. Hayashi; Noriyuki Suzuki
Source:
Science of the total environment 2019 v.689 pp. 843-853
ISSN:
0048-9697
Subject:
basins; emissions; environmental fate; georeferencing; households; models; rivers; sediments; sewage systems; sewage treatment; siloxanes; wastewater; wastewater treatment; watersheds; Japan
Abstract:
... We investigated the multimedia fate of decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) in the densely populated catchment basin of Tokyo Bay, Japan, by using a georeferenced multimedia model. We estimated the daily per person consumption rate of these compounds in Japan according to literature. Emissions to the atmosphere accounted for almost all of the emissions of these ...
DOI:
10.1016/j.scitotenv.2019.06.462

63. Glycerol dialkyl glycerol tetraethers in the Ohno River estuary, Japan during the Holocene

Author:
Masanobu Yamamoto; Yasuto Yamamoto; Keiji Takemura
Source:
Quaternary international 2017 v.452 pp. 129-136
ISSN:
1040-6182
Subject:
drainage; estuaries; fossils; glycerol; isoprenoids; mixing; organic matter; paleoclimatology; rivers; sediments; soil; watersheds; Japan
Abstract:
... We investigated glycerol dialkyl glycerol tetraethers (GDGTs) in sediments taken from a 97 m long borehole core in the estuary of the Ohno River, Kyushu, Japan. Our aim was to understand the influence of estuary-produced branched GDGTs on MBT′/CBT indices and the terrestrial contribution on TEX86 in estuary sediments by comparing with soils in its drainage basin and offshore marine sediments.In bo ...
DOI:
10.1016/j.quaint.2016.06.024

64. Habitat use by spinous loach (Cobitis shikokuensis) in southwestern Japan: importance of subsurface interstices

Author:
Kawanishi, Ryota; Kudo, Yuta; Inoue, Mikio
Source:
Ecological research 2010 v.25 no.4 pp. 837-845
ISSN:
0912-3814
Subject:
Cobitis; decision support systems; endangered species; fish; habitat preferences; habitats; rivers; sediments; streams; Japan
Abstract:
... We examined habitat use by spinous loach (Cobitis shikokuensis), an endangered benthic fish in Japan, in relation to distance to the stream bank, water depth, current velocity, substrate types and bed-subsurface conditions (fine-sediment volume, vertical hydraulic gradient). In the study reach (Shigenobu River in Shikoku Island), spinous loach exhibited a patchy distribution within the channel, be ...
DOI:
10.1007/s11284-010-0714-2

65. Heavy metals in Lake Yanaka, Japan, an artificial retarding basin established for remediation of heavy metals contamination in the Watarase River

Author:
Chisato Kataoka; Takumi Ikushima; Shosaku Kashiwada
Source:
Journal of trace elements and minerals 2022 v.2 pp. 100006
ISSN:
2773-0506
Subject:
Japan; basins; bioaccumulation; heavy metals; human health; intestines; lakes; pollution; remediation; rivers; sediments
Abstract:
... The Watarase Retarding Basin (WRB) involving Lake Yanaka was established for the sedimentation of the heavy metals contaminating the Watarase River in 1989. The Ashio Copper Mine poisoning (ACMP) incident that occurred from the late 19th century to the 1970s caused serious heavy metal contaminations along the Watarase River. Since stopping the mining activity in 1973, the heavy metal concentration ...
DOI:
10.1016/j.jtemin.2022.100006

66. Heterogeneous distribution of a floating-leaved plant, Trapa japonica, in Lake Mikata, Japan, is determined by limitations on seed dispersal and harmful salinity levels

Author:
Jun Nishihiro; Yoshikazu Kato; Takehito Yoshida; Izumi Washitani
Source:
Ecological research 2014 v.29 no.5 pp. 981-989
ISSN:
0912-3814
Subject:
Trapa; adverse effects; brackish water; germination; laboratory experimentation; lakes; remote sensing; rivers; seawater; sediments; seed dispersal; seeds; surveys; water salinity; Japan; Sea of Japan
Abstract:
... Factors affecting the within-lake distribution of Trapa japonica were analysed in Lake Mikata, Japan, by integrating remote sensing analyses, field surveys, and laboratory experiments. The T. japonica bed has been expanding since 2006 and covered more than 60 % of the lake’s area from 2008 to 2010. However, two parts of the lake, the upper and lower areas, retained open water, even during recent y ...
DOI:
10.1007/s11284-014-1186-6

67. Historical Distribution of PCDDs, PCDFs, and Coplanar PCBs in Sediment Core of Ariake Bay, Japan

Author:
Yun-Seok Kim; Heesoo Eun; Takao Katase
Source:
Archives of environmental contamination and toxicology 2008 v.54 no.3 pp. 395-405
ISSN:
0090-4341
Subject:
cluster analysis; history; pentachlorophenol; persistent organic pollutants; polychlorinated biphenyls; polychlorinated dibenzofurans; rivers; sediments; tetrachlorodibenzo-p-dioxin; Japan
Abstract:
... Persistent organic pollutants, particularly polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), coplanar polychlorinated biphenyls (co-PCBs) and toxic equivalent quantity (pg TEQ g⁻¹) were determined in sediment samples collected from Ariake Bay, Japan. The total concentration of PCDDs/DFs in surface sediment of the Yabe River (17,000 pg g⁻¹ dry wt) was approximately ...
DOI:
10.1007/s00244-007-9036-y
PubMed:
17917762

68. How Does the Japanese Water Shrew Chimarrogale platycephalus Cross the Concrete Walls of Check Dams?

Author:
Hiroaki Saito; Hiroshi Hashimoto; Teruaki Hino; Masaharu Motokawa
Source:
Mammal study 2019 v.44 no.1 pp. 1-11
ISSN:
1348-6160
Subject:
concrete; dams (hydrology); rivers; sediments; shrews; streams; surveys; Japan
Abstract:
... The concrete walls of check dams are considered a physical barrier for aquatic and semiaquatic animals that inhabit mountain streams. Traveling behaviors around concrete check dams by the Japanese water shrew Chimarrogale platycephalus, a semi-aquatic mammal, were directly observed via radio-tracking in Kamikoshi Stream in central Honshu, Japan. Traveling behaviors were mainly observed on the wet ...
DOI:
10.3106/ms2017-0056

69. Hydrology, suspended sediment dynamics and nutrient loading in Lake Takkobu, a degrading lake ecosystem in Kushiro Mire, northern Japan

Author:
Young Sang Ahn; Futoshi Nakamura; Shigeru Mizugaki
Source:
Environmental monitoring and assessment 2008 v.145 no.1-3 pp. 267-281
ISSN:
0167-6369
Subject:
agricultural watersheds; channelization; drainage systems; ecosystems; floods; habitats; lakes; nitrogen content; nutrient content; nutrients; phosphorus; pollution load; river water; rivers; sediments; streams; water flow; Japan
Abstract:
... Suspended sediment and nutrient loadings from agricultural watersheds have lead to habitat degradation in Lake Takkobu. To examine their relationships with land-use activities, we monitored sediment, nutrient and water discharges into the lake for a 1-year sampling period. The Takkobu River contributed the largest portion of the annual water discharge into the lake, compared with the other tributa ...
DOI:
10.1007/s10661-007-0036-1

70. Impact of flood events on macrobenthic community structure on an intertidal flat developing in the Ohta River Estuary

Author:
Wataru Nishijima; Yoichi Nakano; Satoshi Nakai; Tetsuji Okuda; Tsuyoshi Imai; Mitsumasa Okada
Source:
Marine pollution bulletin 2013 v.74 no.1 pp. 364-373
ISSN:
0025-326X
Subject:
Polychaeta; cluster analysis; community structure; estuaries; floods; littoral zone; population; rivers; salinity; sediments; summer; water pollution; Japan
Abstract:
... We investigated the effects of river floods on the macrobenthic community of the intertidal flat in the Ohta River Estuary, Japan, from 2005 to 2010. Sediment erosion by flood events ranged from about 2–3cm to 12cm, and the salinity dropped to 0‰ even during low-intensity flood events. Cluster analysis of the macrobenthic population showed that the community structure was controlled by the physica ...
DOI:
10.1016/j.marpolbul.2013.06.028

71. Impacts of freeze-thaw processes and subsequent runoff on 137Cs washoff from bare land in Fukushima

Author:
Yasunori Igarashi; Yuichi Onda; Yoshifumi Wakiyama; Kazuya Yoshimura; Hiroaki Kato; Shohei Kozuka; Ryo Manome
Source:
Science of the total environment 2021 v.769 pp. 144706
ISSN:
0048-9697
Subject:
Japan; accidents; autumn; cesium radioisotopes; environment; freeze-thaw cycles; nuclear power; particulates; power plants; rain; rill erosion; rivers; runoff; scanners; sediment yield; sediments; soil; spring; summer; topography
Abstract:
... The deposited ¹³⁷Cs is one of the long-lived radionuclides, that was released following the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, has been hydrologically transported as particulates in the terrestrial environment of the Fukushima region. The impact of freeze-thaw processes and subsequent runoff affecting the ¹³⁷Cs flux and concentration in sediment discharge were revealed in bar ...
DOI:
10.1016/j.scitotenv.2020.144706

72. Increase in silicon concentrations and release from suspended solids and bottom sediments in Lake Kasumigaura, Japan

Author:
Hiroyuki Arai; Takehiko Fukushima; Kazuhiro Komatsu
Source:
Limnology 2012 v.13 no.1 pp. 81-95
ISSN:
1439-8621
Subject:
lakes; rivers; sediments; silicon; statistical analysis; water temperature; Japan
Abstract:
... Increasing trends of dissolved Si measured by a colorimetric method and ICP (DSicol and DSiICP, respectively) and total Si concentrations were detected at the center of Lake Kasumigaura during 1980–2006 (mean DSicol concentration in the 1980s and 2000s was 1.3 and 4.0 mg l−1, respectively). The observation of such trends is rare; therefore, the elucidation of the causes could be useful to un ...
DOI:
10.1007/s10201-011-0358-0

73. Influence of deposition in dam reservoir on the deep marine hemipelagic environment off Niigata, central Japan

Author:
Masaaki Shirai; Takako Utsugawa; Akiko Omura; Ryo Hayashizaki; Katsura Kameo; Yuichi Niwa; Hitoshi Shimizu
Source:
Environmental earth sciences 2017 v.76 no.3 pp. 107
ISSN:
1866-6280
Subject:
bioturbation; coasts; lead; marine environment; models; radionuclides; rivers; sediment transport; sediments; Japan
Abstract:
... It has been well known that dam construction on rivers can cause a decrease in sediment supply and serious coastal erosion, while influence of dams on the sedimentary environment beyond the coastal area has not been well known. The mass accumulation rate (MAR) in the hemipelagic environment (500–700 m water depth) off Niigata, central Japan since the early half of the twentieth century was obtaine ...
DOI:
10.1007/s12665-017-6430-2

74. Japan's sediment flux to the Pacific Ocean revisited

Author:
Oliver Korup; Yuichi Hayakawa; Alexandru T. Codilean; Yuki Matsushi; Hitoshi Saito; Takashi Oguchi; Hiroyuki Matsuzaki
Source:
Earth-science reviews 2014 v.135 pp. 1-16
ISSN:
0012-8252
Subject:
Holocene epoch; climate; dams (hydrology); deformation; islands; landslides; mass transfer; mountains; prediction; rain; rivers; sediment transport; sediment yield; sediments; tectonics; topographic slope; watersheds; Japan; Pacific Ocean; South East Asia
Abstract:
... Quantifying volumes and rates of delivery of terrestrial sediment from island arcs to subduction zones is indispensable for refining estimates of the thickness of trench fills that may eventually control the location and timing of submarine landslides and tsunami-generating mega-earthquakes. Despite these motivating insights, knowledge about the rates of erosion and sediment export from the Japane ...
DOI:
10.1016/j.earscirev.2014.03.004

75. Latest pleistocene to holocene alluvial basin construction: An example from the Nara Basin, central Japan

Author:
Nobuaki Itoh; Kazuaki Hori; Masashi Takada
Source:
Quaternary international 2017 v.455 pp. 102-112
ISSN:
1040-6182
Subject:
alluvial plains; anthropogenic activities; basins; climate change; coastal plains; mountains; rivers; sea level; secondary forests; sediments; stratigraphy; subsidence; tectonics; Japan
Abstract:
... The response of alluvial plains or basins located upstream from the limit of marine deposition to allogenic forcing, such as sea level and climate change, has received little attention compared with adjacent coastal plains. This study investigates the stratigraphy and evolution of an alluvial basin in Nara, Japan, which has formed along the middle reaches of the Yamato River and its tributaries si ...
DOI:
10.1016/j.quaint.2017.06.016

76. Long-range transport of heavy metals from the Asian continent contributes to surface sediments in Lakes Shinji and Nakaumi in western Japan

Author:
Kenji Kusunoki; Masahiro Sakata
Source:
Limnology 2018 v.19 no.1 pp. 43-52
ISSN:
1439-8621
Subject:
aerosols; air pollutants; air pollution; antimony; atmospheric deposition; cadmium; copper; environmental impact; estuaries; heavy metals; lakes; lead; rain; rivers; sediments; zinc; Japan
Abstract:
... To evaluate the contribution of the long-range transport of heavy metals from the Asian continent to the enrichment of surface sediments in western Japan, heavy-metal (Cd, Cu, Pb, Sb, and Zn) concentrations were measured in sediment cores collected at three sites each in Lakes Shinji and Nakaumi. Sedimentation fluxes of these metals were calculated on the basis of their concentrations in excess of ...
DOI:
10.1007/s10201-017-0517-z

77. Low nitrous oxide concentration and spatial microbial community transition across an urban river affected by treated sewage

Author:
Yiwen Zhou; Risako Toyoda; Toshikazu Suenaga; Tomo Aoyagi; Tomoyuki Hori; Akihiko Terada
Source:
Water research 2022 v.216 pp. 118276
ISSN:
0043-1354
Subject:
Japan; United Nations Framework Convention on Climate Change; denitrification; denitrifying microorganisms; equations; genes; greenhouse gases; microbial communities; municipal wastewater; nitrates; nitrification; nitrogen; nitrous oxide; regression analysis; research; rivers; sediments; sewage treatment; summer; wastewater treatment; water; winter
Abstract:
... Urban rivers receive used water derived from anthropogenic activities and are a crucial source of the potent greenhouse gas nitrous oxide (N₂O). However, considerable uncertainties still exist regarding the variation and mechanisms of N₂O production in response to the discharge of treated sewage from municipal wastewater treatment plants (WWTPs). This study investigated N₂O concentrations and micr ...
DOI:
10.1016/j.watres.2022.118276

78. Mass balance and latest fluxes of radiocesium derived from the fukushima accident in the western North Pacific Ocean and coastal regions of Japan

Author:
Michio Aoyama; Daisuke Tsumune; Yayoi Inomata; Yutaka Tateda
Source:
Journal of environmental radioactivity 2020 v.217 pp. 106206
ISSN:
0265-931X
Subject:
accidents; atmospheric deposition; cesium radioisotopes; coasts; decontamination; inventories; radioactivity; rivers; sediments; soil; Japan; Pacific Ocean; Sea of Japan
Abstract:
... This article summarizes and discusses mass balance calculations of the activities of Fukushima-derived ¹³⁷Cs released to the atmosphere and ocean prior to 2018 as well as the ¹³⁷Cs inventories on land and in the ocean, biota, and sediment. We propose that the consensus value of the total amount of ¹³⁷Cs released to the atmosphere was 15–21 PBq; atmospheric deposition of ¹³⁷Cs on land was 3–6 PBq; ...
DOI:
10.1016/j.jenvrad.2020.106206

79. Microhabitat differences in crab assemblage structures in a subtropical mangrove estuary on Iriomote Island, southern Japan

Author:
Shun Kawaida; Kusuto Nanjo; Takahiro Kanai; Hiroyoshi Kohno; Mitsuhiko Sano
Source:
Fisheries science 2017 v.83 no.6 pp. 1007-1017
ISSN:
0919-9268
Subject:
correspondence analysis; crabs; estuaries; mangrove forests; microhabitats; oxygen; rivers; roots; sediments; soil; species diversity; temperature; Japan
Abstract:
... Crab assemblage structures in sandy flat, muddy flat and mangrove forest microhabitats in a mangrove estuary of the Urauchi River, Iriomote Island, southern Japan, differed clearly among the three microhabitats, species and individual numbers being greater inside the mangrove forest than on the flats. A similarity index showed distinct differences in species composition among the microhabitat asse ...
DOI:
10.1007/s12562-017-1139-4

80. Middle to late Holocene flood activity estimated from loss on ignition of peat in the Ishikari lowland, northern Japan

Author:
Yuji Ishii; Kazuaki Hori; Arata Momohara
Source:
Global and planetary change 2017 v.153 pp. 1-15
ISSN:
0921-8181
Subject:
El Nino; climate; climate change; floodplains; floods; monsoon season; paleoclimatology; peat; risk; rivers; sediments; summer; temporal variation; watersheds; Japan
Abstract:
... Reconstruction of the magnitude and frequency of past floods is important for assessments of flood risk. However, there have been few reconstructions of past flood activity based on long-term continuous records from a single fluvial system and thus suitable for comparison with other paleoclimate proxies. Consequently, the influence of climate change on flood activity remains unclear. Floodplain pe ...
DOI:
10.1016/j.gloplacha.2017.04.004

81. Middle to late-Holocene decreased fluvial aggradation and widespread peat initiation in the Ishikari lowland (northern Japan)

Author:
Yuji Ishii; Kazuaki Hori; Arata Momohara; Toshimichi Nakanishi; Wan Hong
Source:
Holocene v.26 no.12 pp. 1924-1938
ISSN:
1477-0911
Subject:
climate change; floodplains; monsoon season; peat; rivers; sea level; sedimentation rate; sediments; summer; China; Japan
Abstract:
... This study investigated the influence of sea-level and climate changes on the decreased fluvial aggradation and subsequent widespread peat initiation in the middle to late-Holocene in the Ishikari lowland, which is a coastal floodplain formed in response to the postglacial sea-level change. By introducing a new approach to separately evaluate the rates of organic and clastic sediment input, we dem ...
DOI:
10.1177/0959683616646189

82. Migration processes of radioactive cesium in the Fukushima nearshore area: Impacts of riverine input and resuspension

Author:
Toshiharu Misonou; Takahiro Nakanishi; Tadahiko Tsuruta; Takehiko Shiribiki; Yukihisa Sanada
Source:
Marine pollution bulletin 2022 v.178 pp. 113597
ISSN:
0025-326X
Subject:
Japan; cesium radioisotopes; coasts; marine pollution; mass transfer; regression analysis; riparian areas; rivers; seawater; sediment traps; sediments; turbidity
Abstract:
... It is essential to evaluate secondary migration caused by riverine input and resuspension from seabed sediments to estimate the future distribution of radioactive cesium (¹³⁷Cs) in the coastal area off Fukushima Prefecture. In particular, the inflow from rivers cannot be ignored because most of the ¹³⁷Cs inflow from rivers is deposited on the coast without elute into seawater. Two mooring systems ...
DOI:
10.1016/j.marpolbul.2022.113597

83. Mineralisation of the herbicide linuron by Variovorax sp. strain RA8 isolated from Japanese river sediment using an ecosystem model (microcosm)

Author:
Satsuma, Koji
Source:
Pest management science 2010 v.66 no.8 pp. 847-852
ISSN:
1526-498X
Subject:
linuron; mineralization; biodegradation; Variovorax; sediments; rivers; bacteria; ecosystems; physical models; stable isotopes; isotope labeling; strains; culture media; carbon dioxide; monolinuron; metobromuron; diuron; monuron; isoproturon; chemical structure; Japan
Abstract:
... BACKGROUND: Linuron is a globally used phenylurea herbicide, and a large number of studies have been made on the microbial degradation of the herbicide. However, to date, the few bacteria able individually to mineralise linuron have been isolated only from European agricultural soils. An attempt was made to isolate linuron-mineralising bacteria from Japanese river sediment using a uniquely designe ...
DOI:
10.1002/ps.1951
PubMed:
20603879

84. Modeling and Evaluating the Performance of River Sediment on Immobilizing Arsenic from Hydrothermally Altered Rock in Laboratory Column Experiments with Hydrus-1D

Author:
P. Tangviroon; T. Igarashi
Source:
Water, air, and soil pollution 2017 v.228 no.12 pp. 465
ISSN:
0049-6979
Subject:
adsorption; arsenic; hazardous waste; iron; minerals; models; oxidation; oxygen; railroads; rivers; rocks; sediments; Japan
Abstract:
... Large volumes of excavated rock are produced as a result of road and railway tunnel construction in Hokkaido, Japan. Due to the geological condition of this region, these rocks have often undergone hydrothermal alterations, causing them to contain elevated amounts of hazardous elements including arsenic (As). Therefore, these excavated rocks are potentially hazardous waste, and proper disposal met ...
DOI:
10.1007/s11270-017-3630-z

85. Modeling radiocesium transport from a river catchment based on a physically-based distributed hydrological and sediment erosion model

Author:
Tsuyoshi Kinouchi; Kazuya Yoshimura; Teppei Omata
Source:
Journal of environmental radioactivity 2015 v.139 pp. 407-415
ISSN:
0265-931X
Subject:
adsorption; agricultural land; cesium; forest canopy; forests; half life; land use; leaching; nuclear power; overland flow; power plants; radionuclides; residential areas; rivers; sediment contamination; sediment yield; sediments; simulation models; spatial variation; suspended sediment; water pollution; watersheds; Japan; Pacific Ocean
Abstract:
... The accident at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in March 2011 resulted in the deposition of large quantities of radionuclides, such as 134Cs and 137Cs, over parts of eastern Japan. Since then high levels of radioactive contamination have been detected in large areas, including forests, agricultural land, and residential areas. Due to the strong adsorption capability of radiocesi ...
DOI:
10.1016/j.jenvrad.2014.07.022

86. Modeling reservoir sedimentation associated with an extreme flood and sediment flux in a mountainous granitoid catchment, Japan

Author:
Goro Mouri; Michiharu Shiiba; Tomoharu Hori; Taikan Oki
Source:
Geomorphology 2011 v.125 no.2 pp. 263-270
ISSN:
0169-555X
Subject:
algorithms; basins; bedload; climate change; digital elevation models; disasters; energy; floods; landslides; methodology; rain; rivers; sediment contamination; sediment deposition; sediment transport; sediments; storms; stream channels; water flow; water quality; watersheds; Japan
Abstract:
... Extreme events, such as large storms and floods, have a major effect on the transport of sediment and contaminants and, hence, on water quality. To be realistic, models designed to predict the short-term transport and fate of sediment and contaminants must include large floods and storms, an idea not incorporated into existing models based on uniform sediment flux. Sediment transport in and to riv ...
DOI:
10.1016/j.geomorph.2010.09.026

87. Modelling of nutrient dynamics and vegetation succession in midstream sediment bars of a regulated river

Author:
Takashi Asaeda; MD H. Rashid
Source:
International journal of river basin management 2014 v.12 no.2 pp. 123-133
ISSN:
1814-2060
Subject:
allometry; biomass; floodplains; flora; herbaceous plants; models; nutrients; rivers; sediments; trees; vegetation; Japan
Abstract:
... In the floodplain of a regulated river with an intermittent flood disturbance, nutrient dynamics is mainly dependent on the successional stage of vegetation, types of flora and initial substrate conditions brought about by a previous large flood. In this study, we collected data on plant and substrate parameters from a gravelly bar of a regulated river in Japan and developed nutrient dynamic and v ...
DOI:
10.1080/15715124.2014.902377

88. Morpho-molecular description of a new HAB species, Pseudocochlodinium profundisulcus gen. et sp. nov., and its LSU rRNA gene based genetic diversity and geographical distribution

Author:
Zhangxi Hu; Ning Xu; Haifeng Gu; Zhaoyang Chai; Kazuya Takahashi; Zhun Li; Yunyan Deng; Mitsunori Iwataki; Kazumi Matsuoka; Ying Zhong Tang
Source:
Harmful algae 2021 v.108 pp. 102098
ISSN:
1568-9883
Subject:
Cochlodinium; DNA barcoding; Japan; biogeography; coasts; data collection; discoloration; estuaries; genes; genetic variation; geographical distribution; habitats; new genus; new species; phylogeny; poisonous algae; rivers; sediments; China; South China Sea; Yellow Sea
Abstract:
... Harmful algal blooms (HABs) caused by an unknown dinoflagellate species have frequently occurred in the Pearl River Estuary, China Since 2006. These blooms were associated with severe water discoloration and economic losses, ranging from several km² to 300 km² with the maximum recorded cell density being 2.77 × 10⁷ cells⋅L⁻¹. This unknown dinoflagellate species was initially identified as Cochlodi ...
DOI:
10.1016/j.hal.2021.102098

89. Morphological Changes of the Lower Tedori River, Japan, over 50 Years

Author:
Dang Minh Hai; Shinya Umeda; Masatoshi Yuhi
Source:
Water 2019 v.11 no.9 pp. -
ISSN:
2073-4441
Subject:
aerial photography; anthropogenic activities; dams (hydrology); data collection; empirical models; rivers; sediments; spatial variation; surveys; temporal variation; topography; watersheds; Japan
Abstract:
... Long-term variation in the morphological characteristics of rivers is complicated as a result of temporally and spatially variable natural processes and anthropogenic disturbances. Better understanding of their relationship is therefore important for river basin management. The present study conducted a detailed analysis of a long-term dataset consisting of a 58-year topographic survey and related ...
DOI:
10.3390/w11091852

90. Morphology Recovery and Convergence of Topographic Evolution in the Natori River Mouth after the 2011 Tohoku Tsunami

Author:
Nguyen Trong Hiep; Hitoshi Tanaka; Nguyen Xuan Tinh
Source:
Water 2022 v.14 no.5 pp. -
ISSN:
2073-4441
Subject:
Japan; coasts; earthquakes; estuaries; evolution; littoral zone; riparian areas; rivers; sediments; shorelines; topography; tsunamis; water
Abstract:
... The 2011 Great East Japan earthquake and tsunami caused significant damage along the coastal region in Miyagi Prefecture. In the Natori River of Miyagi Prefecture, the recovery process of the estuarine morphology has been observed since the tsunami arrived. In this study, detailed analyses of collected aerial photographs and beach topography in front of the river mouth were conducted to evaluate w ...
DOI:
10.3390/w14050715

91. Multiple‐indicator study of groundwater flow and chemistry and the impacts of river and paddy water on groundwater in the alluvial fan of the Tedori River, Japan

Author:
Yumi Iwasaki Yoshioka; Kimihito Nakamura; Takanori Nakano; Haruhiko Horino; Ki‐Cheol Shin; Satoko Hashimoto; Shigeto Kawashima
Source:
Hydrological processes 2016 v.30 no.16 pp. 2804-2816
ISSN:
0885-6087
Subject:
bicarbonates; calcium; deuterium; groundwater; groundwater flow; hydrochemistry; ions; magnesium; mathematical models; mixing; model validation; oxygen; paddies; river water; rivers; sediments; stable isotopes; strontium; sulfates; Japan
Abstract:
... To investigate the source, flow paths, and chemistry of rich resources of high‐quality, shallow groundwater in the alluvial fan between the Tedori and Sai rivers in central Japan, we analysed stable isotope ratios of H, O, and Sr and concentrations of major dissolved ions and trace elements in groundwater, river water, and paddy water. The ⁸⁷Sr/⁸⁶Sr ratios of the groundwater are related to near‐su ...
DOI:
10.1002/hyp.10785

92. Numerical Study of Discharge Adjustment Effects on Reservoir Morphodynamics and Flushing Efficiency: An Outlook for the Unazuki Reservoir, Japan

Author:
Taymaz Esmaeili; Tetsuya Sumi; Sameh A. Kantoush; Yoji Kubota; Stefan Haun; Nils Rüther
Source:
Water 2021 v.13 no.12 pp. -
ISSN:
2073-4441
Subject:
Japan; algorithms; drawdown; hydrodynamics; hydroelectric power; mathematical models; rivers; sediments; transportation; water; watersheds
Abstract:
... The Unazuki Reservoir is located on the Kurobe River, which is influenced by a catchment with one of the highest sediment yields in Japan. Due to a sufficiently available discharge during flood events, annual sediment flushing with full water-level drawdown (i.e., free-flow sediment flushing) is conducted to preserve the effective storage capacity of the reservoir. Nevertheless, the upstream half ...
DOI:
10.3390/w13121624

93. Numerical and experimental study on the risk of paddy field damage due to river bank breach during serious floods

Author:
Tetsuro Tsujimoto; Kumiko Tsujimoto
Source:
Paddy and water environment 2019 v.17 no.2 pp. 247-253
ISSN:
1611-2490
Subject:
Oryza sativa; climate change; disasters; floods; laboratory experimentation; land use; landscapes; paddies; ponds; rain; residential areas; rice; rivers; rural areas; sediment transport; sediments; soil; Japan
Abstract:
... In Japan, paddy fields located adjacent to rivers are a familiar landscape in rural areas, and they are divided from rivers by soil banks. Soil banks are easily breached by overtopping in floods. Previously, although soil banks were often breached in many locations, inundation in paddy fields was not necessarily a serious disaster, but it was rather positively accepted as a nutrient supplier to pa ...
DOI:
10.1007/s10333-019-00717-2

94. Nutrient Retention Associated with Phenological Features in Sparganium Erectum Stands in a Lowland Stream

Author:
T. Asaeda; M. H. Rashid
Source:
River research and applications 2015 v.31 no.2 pp. 207-215
ISSN:
1535-1459
Subject:
Sparganium erectum; carbon; carbon nitrogen ratio; developmental stages; macrophytes; nitrogen; nitrogen content; nutrient retention; organic matter; phosphorus; plant tissues; rivers; sediments; shoots; streams; trophic relationships; Japan
Abstract:
... In a previous study, we found that Sparganium erectum, an emergent macrophyte, accumulates sediment inside the stand because of its phenological features. Because this species usually grows in a nutrient‐rich environment, we hypothesize that a high trophic level is maintained in the accumulated sediment. To test this hypothesis, we intensively studied flow velocity, nutrient budget and nutrient fl ...
DOI:
10.1002/rra.2733

95. Occurrence and Source of Chlorinated Polycyclic Aromatic Hydrocarbons (Cl-PAHs) in Tidal Flats of the Ariake Bay, Japan

Author:
Sankoda Kenshi; Kuribayashi Tomonori; Nomiyama Kei; Shinohara Ryota
Source:
Environmental Science & Technology 2013 v.47 no.13 pp. 7037-7044
ISSN:
1520-5851
Subject:
anthracenes; dust; photochemical reactions; rivers; salinity; sediments; surveys; ultraviolet radiation; watersheds; Japan
Abstract:
... In this study, we hypothesize that natural photochemical reactions of polycyclic aromatic hydrocarbons (PAHs) in tidal flats are responsible for the occurrence of chlorinated polycyclic aromatic hydrocarbons (Cl-PAHs). This study aims to survey the impact of photochemical reactions using a combination of field surveys and lab-scale experiments. Concentrations and profiles of PAHs and Cl-PAHs in ro ...
DOI:
10.1021/es3044483

96. Occurrence and profiles of organic sun-blocking agents in surface waters and sediments in Japanese rivers and lakes

Author:
Yutaka Kameda; Kumiko Kimura; Motonobu Miyazaki
Source:
Environmental pollution 2011 v.159 no.6 pp. 1570-1576
ISSN:
0269-7491
Subject:
benzophenones; effluents; sediments; rivers; ultraviolet radiation; lakes; sewage treatment; wastewater; surface water; stabilizers; filters; Japan
Abstract:
... Sun-blocking agents including eight UV filters (UVF) and 10 UV light stabilizers (UVLS) were measured in water and sediment collected from 22 rivers, four sewage treatment plant effluents (STPE) and three lakes in Japan. Total sun blocking agents levels ranged from N.D. to 4928ng/L and from 2.0 to 3422μg/kg dry wt in surface water and in sediment, respectively. Benzyl salicylate, benzophenone-3, 2 ...
DOI:
10.1016/j.envpol.2011.02.055
PubMed:
21429641

97. Optimal conservation planning of multiple hydrological ecosystem services under land use and climate changes in Teshio river watershed, northernmost of Japan

Author:
Min Fan; Hideaki Shibata; Qing Wang
Source:
Ecological indicators 2016 v.62 pp. 1-13
ISSN:
1470-160X
Subject:
Soil and Water Assessment Tool model; anthropogenic activities; climate; climate change; conservation areas; economic development; ecosystem services; ecosystems; environmental protection; forests; issues and policy; land use planning; nutrient retention; paddies; rivers; sediments; stakeholders; temperature; topography; water quality; watersheds; Japan
Abstract:
... Most anthropogenic activities impacted on water quality and quantity, and further impacted on ecosystem services (ESs) in watershed are related to land use and climate changes those may cause losses of ecosystem functions. Effective information regarding ESs and their optimal priority conservation planning responded to land use and climate changes provide useful support for diverse stakeholders in ...
DOI:
10.1016/j.ecolind.2015.10.064

98. Palaeoflood records of the last three centuries from the Pyeongchang and Dong rivers, South Korea

Author:
Song-Hyun Kim; Yukiya Tanaka
Source:
Geomorphology 2017 v.290 pp. 211-221
ISSN:
0169-555X
Subject:
bioturbation; cesium; color; hydrology; paleoclimatology; radionuclides; rivers; sediments; soil formation; Japan; South Korea
Abstract:
... Slackwater deposits are paleostage indicators in paleoflood hydrology that have commonly been used in numerous studies to estimate the magnitude and frequency of flood events and to reconstruct paleoenvironments and paleohydrology. In this study, individual flood events along the Pyeongchang (PC) and Dong (D) rivers of South Korea were differentiated on the basis of changes in deposit color, grain ...
DOI:
10.1016/j.geomorph.2017.04.028

99. Paleoceanographic changes in the Ulleung Basin, East (Japan) Sea, during the last 20,000years: Evidence from variations in element composition of core sediments

Author:
Dhongil Lim; Zhaokai Xu; Jinyong Choi; Soyoung Kim; Eunhee Kim; Sora Kang; Hoisoo Jung
Source:
Progress in oceanography 2011 v.88 no.1-4 pp. 101-115
ISSN:
0079-6611
Subject:
barium; cadmium; calcium; calcium carbonate; carbon; color; copper; elemental composition; manganese; molybdenum; monsoon season; organic matter; oxygen; primary productivity; rivers; sediments; strontium; summer; zinc; Japan; Sea of Japan
Abstract:
... A millennial-scale paleoceanographic record of the Ulleung Basin in the southern part of the East (Japan) Sea (ES) for the last 20,000years was reconstructed based on variations in the element compositions of core sediment. Most of the elements showed relatively wide content ranges throughout the core, largely because of different sediment types, their grain size spectra, biological components, an ...
DOI:
10.1016/j.pocean.2010.12.016

100. Particulate organic matter in rivers of Fukushima: An unexpected carrier phase for radiocesiums

Author:
Maud Naulier; Frédérique Eyrolle-Boyer; Patrick Boyer; Jean-Michel Métivier; Yuichi Onda
Source:
Science of the total environment 2017 v.579 pp. 1560-1571
ISSN:
0048-9697
Subject:
accidents; autumn; biomass; carbon; cesium; inventories; leaves; marine environment; models; nuclear power; organic compounds; particulate organic matter; power plants; radionuclides; rivers; sediment contamination; sediment deposition; sediments; soil; suspended sediment; typhoons; water pollution; watersheds; Japan
Abstract:
... The role of particulate organic matter in radiocesium transfers from soils to rivers was investigated in areas contaminated by the Fukushima Daiichi Nuclear Power Plant accident. Suspended and deposited sediments, filtered water, macro organic debris and dead leaves were sampled along the six most contaminated coastal river catchments of the Fukushima prefecture in the early autumns 2013 and 2014. ...
DOI:
10.1016/j.scitotenv.2016.11.165