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Estimation of sediment yield to Chacha Dam Reservoir (case study, upper Abbay Basin Ethiopian)

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dc.contributor.advisor Dereje, Hailu (PhD)
dc.contributor.author Woldetensay, Sidelil
dc.date.accessioned 2019-06-07T06:09:45Z
dc.date.available 2019-06-07T06:09:45Z
dc.date.issued 2019-05-22
dc.identifier.uri http://localhost:80/xmlui/handle/123456789/18411
dc.description.abstract Soil erosion is a major problem through the upper Blue Nile basin Ethiopia. This study is important to estimate sediment generate at chacha dam reservoir and evaluate its consequences on the reservoir through long term optimum management program. When the flow of river is obstructed and stored in reservoirs, the sediment settles, deposit and reduces its capacity. Sediment settle in a reservoir is a serious problem that threatens sustainability of the reservoir. The chacha dam site was located on Ajiba river (upper Abbay Basin) approximately at UTM coordinates of 1062926N and 549376 E particularly Angolela Tara Woreda north Showa zone Amhara region. The main objective of this study was to estimate sediment yield in the chacha dam reservoirs with SWAT model, to identify the spatial and temporal variation of sediment yield and to recommend appropriate sediment reduction measure. The Soil and Water Assessment Tool physically based semi distributed hydrological model is utilized for sediment yield estimation in the chacha watershed (after watershed delineated areas was 577.5km2). The model is calibrated and validated for both flow and sediment and evaluation the model using Nash–Sutcliffe coefficient and coefficient of determination at chacha dam outlet (at area 577.5 km2). Model calibration and validation were done after checking the performance of sensitive analysis. The first most sensitive parameters were saturated hydraulic conductivity (SOL_K) for flow calibration and urban BMP is applied (SED_CON) for sediment calibration. For flow calibration the coefficient of determination and Nash-Sutcliffe coefficient give as 0.85 and 0.84 respectively and flow validation the coefficient of determination and Nash-Sutcliffe coefficient give as 0.66 and 0.66 respectively. Sediment calibration the coefficient of determination and Nash-Sutcliffe coefficient give as 0.7 and 0.7 respectively. Sediment validation the coefficient of determination and Nash-Sutcliffe coefficient give as 0.74 and 0.74 respectively. Both the calibration and validation result indicated that good agreement between observed and simulated stream flow and sediment yield. The model simulated result shows that the average annual sediment yield is 144.28 ton/km2/year at the dam site. Spatial and temporal variation of sediment yield were performed. The spatial variation of sediment ranges from 0.66 ton/ha to 39.5ton/ha. Scenario was developed from HRU definition at land use refinement and HRU threshold for reduction of sediment yield using SWAT Model in the chacha dam reservoir. en_US
dc.language.iso en_US en_US
dc.publisher Addis Ababa University en_US
dc.subject SWAT model en_US
dc.subject Sediment Yield en_US
dc.subject Simulation en_US
dc.subject Calibration en_US
dc.subject validation en_US
dc.subject SWAT CUP en_US
dc.title Estimation of sediment yield to Chacha Dam Reservoir (case study, upper Abbay Basin Ethiopian) en_US
dc.type Thesis en_US


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