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UNESCO-IHE Institute for Water Education, Delft (2014)

The effect of soil erosion on reservoirs : a case study on Belbela reservoir, Ethiopia

Teka, M.T.

Titre : The effect of soil erosion on reservoirs : a case study on Belbela reservoir, Ethiopia

Auteur : Teka, M.T.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2014

Résumé partiel
Soil erosion is an immense problem that has threatened water resource development in Ethiopian watersheds. The Belbela watershed is located in central highlands of Ethiopia. This watershed is one of the watersheds where sediment yield is an issue for reservoir management. Due to the increasing cultivation practice, the problem of land degradation and reservoir sedimentation is apparent in this watershed. The outlet of Belbela watershed is dammed to formulate Belbela reservoir. This reservoir is the main water source for more than 700 ha cultivation areas. It is known that reservoirs will lose their capacity due to sedimentation, and are therefore seriously threatened in their performance. Due to this, an insight in to Soil erosion and sedimentation mechanisms and mitigation methods plays a crucial role for sustainable water resource development in the catchment. More specifically, understanding of the quantity of soil erosion in the watershed and its deposition in the reservoir is necessary for effective watershed and reservoir management. The main objective of the research is to model the spatially distributed soil erosion processes in the watershed of the study area in order to predict their influence on the reservoir life expectancy. It is also to assess the impact of different watershed best management practice (BMP) scenarios (i.e. stone line, ploughing on contour and strip cultivation) on sediment yield for sustainability of the reservoir. An integrated hydrological and sediment yield model called Soil and Water Assessment Tool (SWAT) was used. The datasets that were used in this research are digital elevation model (DEM), land use map, soil map, weather data and hydrology data.

Sujets  : soil erosion reservoirs case studies Ethiopia

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