The Impact of Soil Erosion in the Upper Blue Nile on Downstream Reservoir Sedimentation (Hardcover)

1 Introduction 1.1 Background 1.2 Research aims 1.3 The Blue Nile Hydrosolidarity Project1.4 General methodology 1.5 Structure of the thesis 2 Blue Nile River Basin 2.1 Nile River 2.1.1 White Nile River 2.1.2 Blue Nile River2.1.3 The Atbara River 2.1.4 The Main Nile River 2.1.5 The Nile Delta 2.2 Blue Nile River and its basin 2.2.1 Location and topography 2.2.2 Climate 2.2.3 Hydrology 2.3 Structures and water extraction for irrigation 2.3.1 Chara Chara Weir and Fincha Dam 2.3.2 Roseires Reservoir 2.3.3 Sennar Reservoir 2.3.4 Proposed Dams 2.3.5 Water extraction 2.4 Sediment transport 2.5 Sedimentation problems in the lower basin 2.5.1 Introduction 2.5.2 Irrigation canals sedimentation 2.5.3 Roseires Reservoir sedimentation 2.5.4 Sennar Reservoir 2.6 Blue Nile Bedform 2.7 Concluding remarks 3 Computations of flow and sediment balances in the Blue Nile river 3.1 Background 3.2 Materials and methods 3.2.1 Data analysis 3.2.2 SWAT model 3.2.3 Model development 3.2.4 Model calibration and validation 3.3 Model application 3.3.1 Results of sensitivity analyses 3.3.2 Results of model calibration and validation 3.3.3 Result of water balance 3.3.4 Assessment of sediment loads 3.4 Land-use change detection 3.4.1 Jemma Sub basin 3.4.2 Didessa Sub basin 3.4.3 South Gojam Sub basin 3.5 Concluding remarks 4 Hydrodynamic characteristics of the Blue Nile River network2 4.1 Background 4.2 Materials and methods 4.2.1 Model input data 4.2.2 Model development 4.2.3 Model calibration and validation 4.3 Assessment of current water distribution 4.4 Concluding remarks 5 Sediment fingerprinting in Roseires Reservoir 5.1 Background 5.2 Sediment sorting inside Roseires Dam 5.2.1 Model description 5.2.2 Hydrodynamic model setup, calibration and validation 5.2.3 Morphodynamic model setup, calibration and validation 5.2.4 Identification of promising coring locations Location 1 Location 2 5.3 Sediment fingerprinting 5.3.1 Samples collection 5.3.2 X-ray Diffraction (XRP) 5.3.3 Cluster analysis 5.3.4 Mineral content results 5.3.5 Cluster analysis results 5.4 Concluding remarks 6 Morphodynamics impacts of Grand Ethiopian Renaissance Dam and Roseires heightening along Blue Nile River 6.1 Background 6.2 New development 6.2.1 Roseires Dam heightening 6.2.2 Grand Ethiopian Renaissance Dam (GERD) 6.3 Model description 6.3.1 Sobek-River model 6.3.2 DelWAQ model 6.3.3 Numerical solution of the advection-diffusion processes 6.4 Data analysis 6.5 Morphodynamic model 6.5.1 Model setup 6.5.2 Model calibration 6.5.3 Model validation 6.5.4 Impact of new developments 6.6 Concluding remarks 7 Discussion and conclusions References SamenvattingAbout the Author