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Sediment balances in the Blue Nile River Basin

International Journal of Sediment Research 2014年第3期29卷 316-328页

作者： Yasir S.A.ALI Alessandra CROSATO Yasir A.MOHAMED Seifeldin H.ABDALLA Nigel G.WRIGHT UNESCO-IHE Westvest 72601 DA Delftthe Netherlands and Hydraulics Research CenterMinistry of Water Resources and ElectricityP.O.Box 318Wad MedaniSudan UNESCO-IHE Westvest 72601 DA Delft and Profat Hydraulics Research CenterMinistry of Water Resources and Electricity School of Civil Engineering University of LeedsFaculty of EngineeringLeeds LS2 9JT.United Kingdom Water Resources Technical Organ Ministry of Water Resources and ElectricityKhartoumSudan UNESCO-IHE Westvest 72601 DA Delft and Research Associate at Civil Engineering and Geosciences Delft University of TechnologyStevin weg 12628 CN Delftthe Netherlands

Rapid population growth in the upper Blue Nile basin has led to fast land-use changes from natural forest to agricultural *** resulted in speeding up the soil erosion process in the highlands and increasing sedimentation further downstream in reservoirs and irrigation *** present,several dams are planned across the Blue Nile River in Ethiopia and the Grand Ethiopian Renaissance Dam is currently under construction near the border with *** will be the largest hydroelectric power plant in *** objective of this paper is to quantify the river flows and sediment loads along the Blue Nile River *** Soil and Water Assessment Tool was used to estimate the water flows from un-gauged *** assess model performance,the estimated sediment loads were compared to the measured ones at selected *** the gauged sub-basins,water flows and sediment loads were derived from the available flow and sediment *** fill in knowledge gaps,this study included a field survey in which new data on suspended solids and flow discharge were collected along the Blue Nile and on a number of *** comparison between the results of this study and previous estimates of the sediment load of the Blue Nile River at El Deim,near the Ethiopian Sudanese border,show that the sediment budgets have the right order of magnitude,although some uncertainties *** gives confidence in the results of this study providing the first sediment balance of the entire Blue Nile catchment at the sub-basin scale.

关键词： Blue Nile basin Sediment balance Field data rating curve SWAT model

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Prediction of sedimentation in reservoirs by combining catchment based model and stream based model with limited data

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International Journal of Sediment Research 2019年第1期34卷 27-37页

作者： Abebe Tadesse Wenhong Dai Hohai University Department of Water Conservancy and Hydropower Engineering

Estimation of sedimentation in reservoirs helps in the management and design of the reservoir's useful capacity. This research was done on the Awash River basin at the Koka Dam Reservoir in Ethiopia. The method applied was the loose integration of the Soil and Water Assessment Tool(SWAT) model and Hydrologic Engineering Center-River Analysis System(HEC-RAS) model for the estimation of the sediment load reaching the reservoir. The SWAT model was used for the estimation of erosion at the catchment level,and the HEC-RAS model was applied to estimate the sediment transport in the river channel. The implemented method allows sedimentation in the floodplains and bed shear stress to be considered in the sediment modeling, which cannot be considered in the SWAT model. In addition, the river cross sectional properties and the hydrodynamic processes in the rivers were considered in the modeling process. The data used in this study are a combination of i) observed data collected by government agencies, ii) data available online in data repositories, and iii) data extracted from remote sensing in the Shuttle Radar Topographic Mission(SRTM) Digital Elevation Model(DEM). The calibration and validation of the SWAT model was done by using Sequential Uncertainty Fitting(SUIF-2) calibration and validation tools. The HEC-RAS model was calibrated by adjusting the roughness factor. The output from the integrated approaches gives better estimates of flow and sediment near the inlet to the reservoir, with coefficients of determination of 0.85 and 0.67, respectively, and Nash Sutcliffe coefficients of model fit efficiency of 0.90 and 0.62, respectively, for daily simulations.

关键词： Reservoir sedimentation Awash River SWAT HEC-RAS rating curve

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EFFECTS OF RIVER ICE ON STAGE-DISCHARGE RELATIONSHIPS——A CASE STUDY OF THE YELLOW RIVER

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International Journal of Sediment Research 2007年第4期22卷 263-272页

作者： Ronald THRING Bryan W. KARNEY Prof. Environmental Engineering University of Northern British Columbia 3333 University Way Prince George BC Canada V2N 4Z9 Prof. Department of Civil Engineering University of Toronto 35 St. George Street Toronto ON Canada M5S 1A4

Using field observations at four gauging stations along the Inner Mongolia Reach of the Yellow River in China, this paper explores effects of the ice on the hydraulics of this river reach for four different conditions, namely: under open channel flow, during ice-running period, the ice-covered period, and the river break-up period. The rating curves were found to be well recognized under open channel situations, but were sometimes poorly defined and extremely variable under ice conditions. The results also show that the water level is insensitive to flowing ice prior to freeze-up. However, significant, but hardly surprising, variations were observed during ice-covered conditions. The rating curves for both the ice covered condition and river ice breakup period are developed and some related hydraulic issues are examined. Additionally, the impacts of the ice accumulation and associated riverbed deformation during ice period on the rating curves are discussed.

关键词： Ice-running period Ice covered period rating curve Riverbed deformation River ice break-up

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