Modelisation Hydrosedimentaire Dans Le Bassin Versant Du Lac Tana En Ethiopie

Author : Agizew Nigussie Engida
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)

DOWNLOAD NOW!

Download or read book Modélisation Hydrosédimentaire Dans Le Bassin Versant Du Lac Tana en Ethiopie written by Agizew Nigussie Engida and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is conducted in Lake Tana basin located in the Upper Blue Nile Basin in Ethiopia where water resources issues are critical and availability of relevant data is poor. The study is divided into three major components that include evaluation and analysis of the existing data, evaluation of the applicability of a physically-based distributed hydrological model and water and suspended sediment balance modeling for Lake Tana. The temporal and spatial coverage of various hydro-meteorological variables was assessed in light of recommended practices in the literature. Analyses of the hydro-meteorological datasets comprised data quality control, and determination of their characteristics in space and time. The applicability of the fully distributed physically-based hydrological model was assessed on selected catchments. The modeling exercise revealed the importance of weather data disaggregation models in generating meteorological forcings at finer time scales. Considering the quality and resolution of the inputs used, the performance of the distributed model could be judged satisfactory in two of the selected mesoscale catchments. The water balance modeling of Lake Tana was done at a monthly time step and involved estimation of the major inflow and outflow components. A dynamic conceptual model was used to estimate the contribution of catchments for which data could not be obtained. The results of the water balance model at monthly and annual time scales was generally good and the observed lake levels could be reproduced satisfactorily. Estimation of the suspended sediment balance of the lake involved development and use of rating curves and a regional area-specific model. The results of the study are useful for planning and management of water resources in the study area.