U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

Search

13  Search Results

1 - 13 of 13
Number of results to display per page

Search Results

1. 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

2. 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

3. 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

4. Contrasting effects of dams with and without reservoirs on the population density of an amphidromous goby in southwestern Japan

Author:
Yoshifumi Sumizaki; Ryota Kawanishi; Mikio Inoue; Motohiro Takagi; Koji Omori
Source:
Ichthyological research 2019 v.66 no.3 pp. 319-329
ISSN:
1341-8998
Subject:
Rhinogobius; dams (hydrology); diadromous fish; freshwater fish; geographical distribution; hatching; juveniles; lakes; larvae; population density; rivers; streams; surface water; surveys; water storage; weirs; Japan
Abstract:
... Dam construction affects the distribution and abundance of freshwater fishes, particularly for diadromous species. Amphidromous fishes spawn in rivers, and hatched larvae descend to the sea (or standing water body such as lakes) immediately after hatching, grow there typically for a few months, and then ascend rivers as small juveniles. Landlocked populations of amphidromous fishes above dams and ...
DOI:
10.1007/s10228-018-00678-2

5. Downstream migration of newly-hatched ayu (Plecoglossus altivelis) in the Tien Yen River of northern Vietnam

Author:
Hau Duc Tran; Midori Iida; Ken Maeda
Source:
Environmental biology of fishes 2017 v.100 no.10 pp. 1329-1341
ISSN:
0378-1909
Subject:
Plecoglossus altivelis; adults; dams (hydrology); fish; habitats; larvae; life history; reproduction; rivers; spawning; surveys; China; Japan; Korean Peninsula; Taiwan; Vietnam
Abstract:
... The ayu (Plecoglossus altivelis) is an annual, amphidromous, plecoglossid fish, distributed in Vietnam, China, Taiwan, Korea, and Japan. To date, ayu have been found only in two rivers in northern Vietnam, where little is known about their life history. The Tien Yen River is believed to be the most southwestern habitat for this species. To determine whether newly hatched ayu larvae drift and to un ...
DOI:
10.1007/s10641-017-0646-6

6. Geographical patterns of flow-regime alteration by flood-control dams in Japan

Author:
Terutaka Mori; Yukio Onoda; Yuichi Kayaba
Source:
Limnology 2018 v.19 no.1 pp. 53-67
ISSN:
1439-8621
Subject:
biodiversity; dams (hydrology); ecosystems; flood control; geographical variation; islands; latitude; rivers; subtropics; temporal variation; water flow; Japan
Abstract:
... Natural variability in water flow is an inherent feature of river ecosystems, but many rivers in the world have been dammed, altering the flow regime and leading to ecosystem degradation. Dam reoperation to maintain environmental flows has been proposed for ecosystem and biodiversity improvement. Reoperation requires an understanding of flow alteration due to dam operations. However, knowledge of ...
DOI:
10.1007/s10201-017-0518-y

7. 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

8. Impacts of dam-regulated flows on channel morphology and riparian vegetation: a longitudinal analysis of Satsunai River, Japan

Author:
Takahashi, Mayumi; Nakamura, Futoshi
Source:
Landscape and ecological engineering 2011 v.7 no.1 pp. 65-77
ISSN:
1860-1871
Subject:
aerial photography; dams (hydrology); land cover; riparian areas; rivers; vegetation types; Japan
Abstract:
... We examined the impacts of the Satsunai River Dam on the hydrology and development of riparian vegetation along the upper and lower reaches of the Satsunai River downstream from the dam. We estimated frequency curves of the flood discharge during the pre-dam (1976-1996) and post-dam (1997-2006) periods and simulated the flood frequency at sampling points within sites under pre-dam, post-dam and da ...
DOI:
10.1007/s11355-010-0114-3

9. 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

10. 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

11. Preliminary assessment of the impacts of sediment sluicing events on stream insects in the Mimi River, Japan

Author:
Kei Nukazawa; Shinsuke Kajiwara; Tsuyoshi Saito; Yoshihiro Suzuki
Source:
Ecological engineering 2020 v.145 pp. 105726
ISSN:
0925-8574
Subject:
Heptageniidae; Simuliidae; aquatic insects; community structure; dams (hydrology); dredging; electric power; environmental impact; fauna; flood control; multidimensional scaling; multivariate analysis; power generation; rivers; sediments; species richness; streams; summer; winter; Japan
Abstract:
... Dam sedimentation is a crucial issue that interferes with flood control and electric power generation. To address this, sediment dredging, bypass tunnel, flushing, and sluicing have been applied. Despite the potential impacts of these operations on stream environments, few studies have explored the environmental/ecological consequences of such regime shifts in sediment dynamics. Specifically, impa ...
DOI:
10.1016/j.ecoleng.2020.105726

12. Spatial and temporal changes in genetic structure and diversity of isolated white-spotted charr (Salvelinus leucomaenis) populations

Author:
Shoichiro Yamamoto; Kentaro Morita; Genki Sahashi
Source:
Hydrobiologia 2019 v.840 no.1 pp. 35-48
ISSN:
0018-8158
Subject:
Salvelinus leucomaenis; anadromous fish; dams (hydrology); effective population size; erosion control; fish communities; freshwater fish; gene flow; genetic markers; genetic variation; habitat fragmentation; heterozygosity; hydroelectric power; microsatellite repeats; population structure; power generation; rivers; temporal variation; Japan
Abstract:
... In Japan, numerous artificial dams constructed for erosion control or hydroelectric power generation have affected almost all rivers and resulted in isolation and fragmentation of many freshwater fish populations. We examined genetic structure and diversity of two temporally isolated samples (spanning 15 years) from 23 white-spotted charr (Salvelinus leucomaenis) populations, including above- and ...
DOI:
10.1007/s10750-019-3924-9

13. Trace of outbreeding between Biwa salmon (Oncorhynchus masou subsp.) and amago (O. m. ishikawae) detected from the upper reaches of inlet streams within Lake Biwa water system, Japan

Author:
Masayuki Kuwahara; Hiroshi Takahashi; Takeshi Kikko; Seiji Kurumi; Kei’ichiro Iguchi
Source:
Ichthyological research 2019 v.66 no.1 pp. 67-78
ISSN:
1341-8998
Subject:
Bayesian theory; Oncorhynchus masou; amplified fragment length polymorphism; anadromous fish; dams (hydrology); fish communities; haplotypes; hybridization; lakes; life history; males; mitochondrial DNA; outbreeding; plasticity; population structure; rivers; salmon; streams; Japan
Abstract:
... The establishment of fluvial fish populations from anadromous populations by natural or artificial barriers obstructing migration is a good research subject to study life history plasticity. Biwa salmon, Oncorhynchus masou subsp., a salmonid fish endemic to the Lake Biwa water system, exhibit life history variation (e.g., mature stream-resident males) in addition to a typical lacustrine life histo ...
DOI:
10.1007/s10228-018-0650-7