Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake
status: published
Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake
We investigated the magnitude of reservoir sedimentation upstream and its sediment-shadow effect on a large downstream-linked lake, Lake Tana (Ethiopia). To better understand the reservoir-induced reductions of fluvial sediment downstream, sediment budgets for two scenarios were developed. The results indicated that reservoir sedimentation is extre...
Land use, management and climate effects on runoff and soil loss responses in the highlands of Ethiopia
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Soil erosion by water is a major cause of land degradation in the highlands of Ethiopia and anywhere else in the world, but its magnitude and variability are rarely documented across land uses and climatological conditions. The purpose of this study was to examine runoff and soil loss responses under cropland (CL) and grazing land (GL) management p...
Investigation of interbasin groundwater flow using multiple approaches : the case of the Tana and Beles basins, Ethiopia...
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In most water balance studies, basins are considered closed systems; however, interbasin groundwater flow (IGF), which is an unaccounted hydrological component in most studies, could occur at basin boundaries where there is a hydraulic gradient and appropriate permeability of the geologic formations. IGF is a complex hydrogeological process and hid...
Organization of the soil profile controls the risks of runoff in the humid Ethiopian Highlands
Erosion of agricultural land endangers the livelihood of millions of people who depend on natural resources. Soil and water conservation practices (SWCP) are intended to reduce runoff production and erosion. Under-standing surface runoff drivers are crucial for the effective design and implementation of SWCPs. We present field observations of compl...
Extent of Lake Tana's papyrus swamps (1985-2020), North Ethiopia
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Lake Tana is the largest freshwater lake in Ethiopia and is the source of the Blue Nile. The lake shorelines and those of its tributary river, Gilgel Abay, are characterized by the occurrence of extensive papyrus swamps (Cyperus papyrus L). While such papyrus swamps are highly recognized for their outstanding ecological and economical importance, t...
Variation of the Omo Delta between 1990 and 2018 : what remote sensing data reveal and models explain
Deltas, being areas where river sediments accumulate, are sensitive to changes in climate and anthropogenic processes that affect sediment generation. The Omo Delta, on the Ethiopia-Kenya border, is constantly changing due to fluctuating lake levels, a variable climate, and rapidly changing land use. Due to field data scarcity and the region's limi...
Factors controlling floodplain sediment storage in two tropical upland river catchments in the Lake Tana basin, Ethiopia...
status: published
Factors controlling floodplain sediment storage in two tropical upland river catchments in the Lake Tana basin, Ethiopia...
Floodplain sediment storage is an important component of a catchment’s sediment budget. Here, we present the first quantification of floodplain sediment storage for tropical river catchments draining to Lake Tana, NW Ethiopia. The catchments are characterized by relatively gently sloping to flat lowlands towards the lake (1788 m a.s.l.) and steeper...
Environmental and Human Health Risks of Pesticide Presence in the Lake Tana Basin (Ethiopia)
Pesticides are widely used for safeguarding agricultural yields and controlling malaria vectors, yet are simultaneously unintentionally introduced in aquatic environments. To assess the severity of this pressure in the Lake Tana Basin (Ethiopia), we evaluated the occurrence of 17 pesticide residues in the lake, tributary rivers, and associated wetl...
