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You searched for: Subject dams (hydrology) Remove constraint Subject: dams (hydrology) Subject sediments Remove constraint Subject: sediments
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1. Evaluation of Changes in the Nile Water Composition Resulting from The Asswan High Dam

Author:
A. Monem Balba
Source:
Journal of environmental quality 1979 v.8 no.2 pp. 153-156
ISSN:
0047-2425
Subject:
cations; dams (hydrology); electrical conductivity; floodplains; hydrochemistry; irrigation water; lakes; nutrients; phosphorus fertilizers; river water; salinity; sediments; sodium adsorption ratio; soil; soluble phosphorus; Nile River
Abstract:
... The composition of Nile River water has been examined to show the effect of the Asswan High Dam on the fertility and salinity of the water for irrigation. The Nile water contains about 110 × 10⁶ metric tons/year of suspended materials as it crosses the Egyptian border. Before the Asswan High Dam was constructed, 24 × 10⁶ metric tons/year of solids were deposited, mainly on the Egyptian flood plain ...
DOI:
10.2134/jeq1979.00472425000800020003x

2. 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

3. Quantitative approach to water erosion at different spatial scales: basin of Oued Mina

Author:
Source:
Hydrological sciences journal 1999 v.44 no.6 pp. 973-986
ISSN:
0262-6667
Subject:
basins; dams (hydrology); marl; models; rainfall simulation; regression analysis; sediment transport; sediments; water erosion; watersheds; Algeria
Abstract:
... The complex phenomenon of water erosion in river basins is examined. The approach adopted aimed to (a) quantify erosion at several spatial scales, using the Wischmeier method, rainfall simulation over 1 and 87 m2 plots, experimental basins, small dams and a reservoir, and (b) to seek the regression model which best explains the relationship between sediment transport and flow rates for the differe ...
DOI:
10.1080/02626669909492292

4. Evidence for the possible role of beaver (Castor fiber) in the prehistoric ontogenesis of a mire in northwest England, UK

Author:
Colin E. Wells; David Hodgkinson; Elizabeth Huckerby
Source:
Holocene 2000 v.10 no.4 pp. 503-508
ISSN:
0959-6836
Subject:
Castor fiber; anthropogenic activities; dams (hydrology); landscapes; ontogeny; peat; pollen; root systems; sediments; stratigraphy; wood; woodlands; England
Abstract:
... Excavation of the relict stratigraphy of a drained, agriculturally reclaimed mire in Lancashire, northwest England, has revealed evidence for prehistoric (i.e., c. 820–520 cal. bc) beaver activity in the form of gnawed timber stratified in the basal sediments. The lowest horizons of the peat deposits contained the intact root systems of a dense hazel wood, indicating that the mire probably owed it ...
DOI:
10.1191/095968300671442402

5. Temporal quantification and variability of sediment discharge in a semiarid area in northern Algeria

Author:
Source:
Hydrological sciences journal 2001 v.46 no.1 pp. 41-53
ISSN:
0262-6667
Subject:
basins; dams (hydrology); models; sediment yield; sediments; semiarid zones; statistical analysis; suspended sediment; Algeria
Abstract:
... In semiarid areas, the temporal irregularity of flow poses serious problems to the engineers responsible for the evaluation of the sediment discharge into the basin. Further, to decide on a methodology to calculate specific erosion, the flow at two gauging stations in adjacent sub-basins is examined; the water of the two sub-basins is combined a few kilometres downstream in an exploitation dam. Tw ...
DOI:
10.1080/02626660109492799

6. Hydrological considerations for dam siting in arid regions: a Saudi Arabian study

Author:
Source:
Hydrological sciences journal 2002 v.47 no.2 pp. 173-186
ISSN:
0262-6667
Subject:
arid zones; dams (hydrology); floods; rain; rain intensity; runoff; sediments; Saudi Arabia
Abstract:
... In any dam siting study in arid regions, rainfall records, runoff measurements and their greatest magnitudes are very important. Unfortunately, the data are scarce and, therefore, empirical approaches and charts obtained from similar regions in other parts of the world are necessary for complete applications. The lack of observed data presents the major problem for runoff modelling in arid regions ...
DOI:
10.1080/02626660209492922

7. Assessment of methods for measuring embeddedness: application to sedimentation in flow regulated streams

Author:
Sennatt, K.M.; Salant, N.L.; Renshaw, C.E.; Magilligan, F.J.
Source:
Journal of the American Water Resources Association 2006 v.42 no.6 pp. 1671-1682
ISSN:
1093-474X
Subject:
dams (hydrology); streams; stream flow; sediments; sediment deposition; sediment transport; seasonal variation; methodology; watershed management; Vermont
DOI:
10.1111/j.1752-1688.2006.tb06028.x

8. Water discharge and sediment flux changes over the past decades in the Lower Mekong River: possible impacts of the Chinese dams

Author:
Lu, X.X.; Siew, R.Y.
Source:
Hydrology and earth system sciences 2006 v.10 no.2 pp. 181-195
ISSN:
1027-5606
Subject:
rivers; water flow; watershed hydrology; sediments; sediment transport; dams (hydrology); sediment deposition; China; South East Asia

9. A laboratory study on the relative stability of the check-dam system in the Loess Plateau, China

Author:
Xu, X.Z.; Zhang, H.W.; Wang, G.Q.; Peng, Y.; Zhang, O.Y.
Source:
Land degradation & development 2006 v.17 no.6 pp. 629-644
ISSN:
1085-3278
Subject:
sediments; soil conservation; water conservation; simulation models; equations; height; watersheds; physical models; dams (hydrology); rain; rain intensity; altitude; runoff; water erosion; rainfall simulation; China
DOI:
10.1002/ldr.740

10. A non-reflecting boundary condition for the finite element modeling of infinite reservoir with layered sediment

Author:
Gogoi, I.; Maity, D.
Source:
Advances in water resources 2006 v.29 no.10 pp. 1515-1527
ISSN:
0309-1708
Subject:
sediments; pressure; finite element analysis; dams (hydrology)
DOI:
10.1016/j.advwatres.2005.11.004

11. Downstream benthic responses to small dam removal in a coldwater stream

Author:
Orr, Cailin H.; Kroiss, Steve J.; Rogers, Kristy L.; Stanley, Emily H.
Source:
River research and applications 2008 v.24 no.6 pp. 804-822
ISSN:
1535-1459
Subject:
sediments; Diptera; Ephemeroptera; benthic organisms; benthic zone; infrastructure; long term effects; habitats; dams (hydrology); periphyton; summer; chlorophyll; Trichoptera; macroinvertebrates; United States
Abstract:
... Increased awareness of the negative effects of dams combined with an aging dam infrastructure has led to an increase in dam removals. However, ecological responses of downstream biota to such actions are poorly understood. We examined the influence of a pair of small dam removals on downstream periphyton and macroinvertebrates in Boulder Creek, WI (USA). The dams were 180 m apart and both were rem ...
DOI:
10.1002/rra.1084

12. Periodicity of sediment load and runoff in the Yangtze River basin and possible impacts of climatic changes and human activities

Author:
Source:
Hydrological sciences journal 2008 v.53 no.2 pp. 457-465
ISSN:
0262-6667
Subject:
afforestation; anthropogenic activities; climate change; dams (hydrology); deforestation; ecology; issues and policy; local government; periodicity; pollution load; river deltas; rivers; runoff; sediment transport; sediment yield; sediments; water reservoirs; watersheds; wavelet; Yangtze River
Abstract:
... Periodicity of the runoff and the sediment load, and possible impacts from human activities and climatic changes, in the Yangtze River basin during 1963–2004 are discussed based on the monthly sediment and runoff data, and using the wavelet approach. Research results indicated that: (a) Sediment load changes are severely impacted by the different types of human activity (e.g. construction of water ...
DOI:
10.1623/hysj.53.2.457

13. Conversion of a Missouri River Dam and Reservoir to a Sustainable System: Sediment Management

Author:
Coker, E. Howard; Hotchkiss, Rollin H.; Johnson, Dennis A.
Source:
Journal of the American Water Resources Association 2009 v.45 no.4 pp. 815-827
ISSN:
1093-474X
Subject:
sediments; sustainable development; cost analysis; environmental management; dams (hydrology); sediment deposition; Missouri River
Abstract:
... A present and future challenge for water resources engineers is to extend the useful life of our dams and reservoirs. Ongoing reservoir sedimentation in impoundments must be addressed; sedimentation in many reservoirs already limits project benefits and effective project life. Sustainability requires that incoming sediment be moved downstream past the impounding dam. We use Lewis and Clark Lake, t ...

14. Design of Settling Basins in Irrigation Network Using Simulation and Mathematical Programming

Author:
Shetab-Boushehri, Sayed-Nader; Mousavi, Sayed-Farhad; Shetab-Boushehri, Sayed-Behzad
Source:
Journal of irrigation and drainage engineering 2010 v.136 no.2 pp. 99-106
ISSN:
0733-9437
Subject:
sediments; cost effectiveness; basins; simulation models; irrigation systems; dams (hydrology); velocity; hydrologic models; Iran
DOI:
10.1061/(ASCE)IR.1943-4774.0000148

15. Phosphorus sorption characteristics of the Bronx River bed sediments

Author:
Jingyu Wang; Hari K. Pant
Source:
Chemical speciation and bioavailability 2010 v.22 no.3 pp. 171-181
ISSN:
0954-2299
Subject:
algal blooms; aluminum; bioavailability; calcium; coastal water; dams (hydrology); estuaries; eutrophication; freshwater; freshwater ecosystems; ionic strength; iron; magnesium; metal ions; organic matter; oxygen; pH; phosphorus; plant growth; rivers; saline water; sediments; sorption; stream channels; water quality; New York
Abstract:
... Phosphorus (P) is a major nutrient for plant growth, and it is often the primary limiting nutrient in freshwater ecosystems controlling algal blooms. The Bronx River of New York City, New York, USA includes freshwater and coastal water systems. The water quality of both fresh and saline water is lower than the standard levels designated by New York State, and classified as Class B and Class I wate ...
DOI:
10.3184/095422910X12827492153851

16. A tenfold increase in the Orange River mean Holocene mud flux: implications for soil erosion in South Africa

Author:
John S. Compton; Caren T. Herbert; M. Timm Hoffman; Ralph R. Schneider; Jan-Berend Stuut
Source:
Holocene 2010 v.20 no.1 pp. 115-122
ISSN:
0959-6836
Subject:
Holocene epoch; clay; dams (hydrology); grazing; rain; rivers; sediments; soil; soil erosion; sustainable agriculture; watersheds; South Africa
Abstract:
... Soil erosion poses a major threat to sustainable agriculture in southern Africa but is difficult to quantify. One measure of soil erosion is the sediment flux of rivers. The Orange River is the principal source of sediment to the western margin of South Africa with an estimated mean mud flux over the last 11 500 years (the Holocene epoch) of 5.1 (3.2—7.4) million metric tons/year (Mt/yr). A total ...
DOI:
10.1177/0959683609348860

17. Ecosystem ecology meets adaptive management: food web response to a controlled flood on the Colorado River, Glen Canyon

Author:
Wyatt F. Cross; Colden V. Baxter; Kevin C. Donner; Emma J. Rosi-Marshall; Theodore A. Kennedy; Robert O. Hall Jr; Holly A. Wellard Kelly; R. Scott Rogers
Source:
Ecological applications 2011 v.21 no.6 pp. 2016-2033
ISSN:
1051-0761
Subject:
Bacillariophyceae; Chironomidae; Gammarus; Oncorhynchus mykiss; Potamopyrgus antipodarum; Simuliidae; Tubificida; adaptive management; aquatic food webs; biomass; dams (hydrology); ecosystems; electricity; fish production; floods; humans; indigenous species; invertebrates; organic matter; recreation; rivers; secondary productivity; sediments; temperature; Colorado River; United States
Abstract:
... Large dams have been constructed on rivers to meet human demands for water, electricity, navigation, and recreation. As a consequence, flow and temperature regimes have been altered, strongly affecting river food webs and ecosystem processes. Experimental high‐flow dam releases, i.e., controlled floods, have been implemented on the Colorado River, USA, in an effort to reestablish pulsed flood even ...
DOI:
10.1890/10-1719.1

18. Modelling scenarios to identify a combined sediment-water management strategy for the large reservoirs of the Tuyamuyun hydro-complex

Author:
Oliver Olsson; Anatoly Sorokin; Malika Ikramova
Source:
Irrigation and drainage systems 2011 v.25 no.1 pp. 1-18
ISSN:
0168-6291
Subject:
sediments; arid zones; irrigation water; irrigation canals; public water supply; rivers; models; semiarid zones; dams (hydrology); sediment deposition
Abstract:
... This paper introduces a combined modelling approach using a simple water budget model (THC-model) and a 3D reservoir sedimentation model (MOHID Water) to adapt reservoir operation and visualise their effects on the sediment deposition. By this, an effective combined sediment-water management can be identified under semi-arid conditions for dry, median and wet years. Results are presented for the r ...
DOI:
10.1007/s10795-011-9107-0

19. Unexpected CH₄ emission from the Three Gorges Reservoir and its implications

Author:
Lin Liu; Huai Chen; Xingzhong Yuan; Zhongli Chen; Yuyuan Wu
Source:
Acta ecologica Sinica 2011 v.31 no.5 pp. 233-234
ISSN:
1872-2032
Subject:
dams (hydrology); greenhouse gas emissions; methane production; scientists; sediments; vegetation; water quality
Abstract:
... Until the end of last century, scientists began to show their concern about greenhouse gas emission from reservoirs and questioned the “green credential” of hydroelectric dams since then. Through measurements along the channel of the TGR, an unexpectedly low CH₄ emission rate was recently observed from the surface of the TGR, much lower than our assumed estimate before. Moreover, the rate from the ...
DOI:
10.1016/j.chnaes.2011.05.001

20. Can biotic resistance be utilized to reduce establishment rates of non-indigenous species in constructed waters?

Author:
Claire M. Taylor; Ian C. Duggan
Source:
Biological invasions 2012 v.14 no.2 pp. 307-322
ISSN:
1387-3547
Subject:
sediments; Copepoda; community structure; lakes; ponds; introduced species; Rotifera; dams (hydrology); species diversity; water; indigenous species; tanks; colonizing ability; nutrients; zooplankton; New Zealand
Abstract:
... Understanding the mechanisms that facilitate establishment of non-indigenous species is imperative for devising techniques to reduce invasion rates. Passively dispersing non-indigenous organisms, including zooplankton, seemingly invade constructed waters (e.g., ornamental ponds, dams and reservoirs) at faster rates than natural lakes. A common attribute of these invaded water bodies is their relat ...
DOI:
10.1007/s10530-011-0063-2