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Al Neelian University (2020)

Water Resources Assessment in the area between Upper Atbara, Setit and Khashm El Girba dams Eastern Sudan

Khalid Elsir Ahmed Nayl

Titre : Water Resources Assessment in the area between Upper Atbara, Setit and Khashm El Girba dams Eastern Sudan

Auteur Khalid Elsir Ahmed Nayl

Université de soutenance : Al Neelian University

Grade : Ph.D. degree in Geology. (Hydrogeology) 2020

Résumé partiel _The study area lies in the eastern Sudan in Kassala and Gedaref states and covering an area of about 3000 Square kilometers. The problem of the study summarized in ; the newly constructed Upper Atbara/Setit dams will lead to major changes in the groundwater system in the study area, most of the villages in the study area are suffering from water scarcity for drinking purpose and some villages have problem in the water quality for domestic uses. The overall objective of the study is to explore and investigate the groundwater potentialities in the area. The identification of the dams effect on the groundwater is one of goals in addition to calculated the hydrogeological parameters and to study the hydrogeological condition in the area which is located between Upper Atbara, Setit and Khashm El Girba dams. Geophysical and Hydrogeological methods were applied to explore the groundwater potentialities in the study area. Resistivity method was applied in these investigations, in which (177) Vertical Electrical Soundings (VES) were conducted. And (64) well logs description have been used to interpret the VES points. Monitoring and well inventory are carried out. Pumping test data for (22) boreholes were used to calculate the aquifer parameters using Jacob’s method. The water budget was calculated using method of losses between two gauge stations and calculating the difference between input and output. (45) Groundwater samples were collected and analyzed at Laboratories of Groundwater Research at Kassala, Gedaref and Khartoum states. The geology of the study area can be concluded in the following units ; the basement complex, the Cretaceous sedimentary rocks are considered as main aquifer zone in Upstream area, the Cenozoic basaltic rocks, River Atbara sediments which represent the saturation zone in the middle and downstream areas, unconsolidated Karab formation and the Superficial deposits. Three major faults represent the major structural phenomena in the study area were identified. Based on varies in apparent resistivity of various formations and sequences (heterogeneity), the study area was divided into three sectors ; Upstream area, Middle area and Downstream area

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