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Interbasin Groundwater Transfer in Upper Rift Valley Lakes and Upper Awash River Basins

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dc.contributor.advisor Mohammed, Mebruk (PhD)
dc.contributor.author Ayalew, Bisrat
dc.date.accessioned 2018-07-23T06:08:05Z
dc.date.available 2018-07-23T06:08:05Z
dc.date.issued 2005-06
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/9636
dc.description.abstract Groundwater models are used to predict the groundwater flow processes using mathematical equations based on certain simplifying assumptions. Numerical modeling method is used to investigate the possibility of groundwater transfer (interbasin groundwater flow) between Upper Awash River basin and Upper Rift Valley Lakes basin. Within the study the hydrogeology is investigated from previous studies, a conceptual groundwater model is produced and the numerical model is developed from this. The model conceptualization is done by idealizing the study area into three models related to the surface water divide and the main perennial Rivers and lakes. For these three basins the boundary conditions are identified and incorporated into the models. The boundaries are Upper Awash River, Meki River, Ziway Lake, and Koka Lake in addition to bottom and top surface of the aquifer in concern. The models are three dimensional steady state by finite element method. All the study basins are discretized according to finite element method into equal element dimensions. The elements are three dimensional. The finite element model used in the study was TAGSAC. The modeling process was towards estimating the hydraulic head in the model basins of the study area by a means of finding the hydraulic conductivity of different geological classifications and estimating surface recharge in terms of some percentage of the rainfall of the study area. Finally the models are calibrated with the measured hydraulic head for each model basins. The models results show that the groundwater divide and the surface water divide are not coincident. There is a clear hydraulic head difference which can make groundwater to flow from Upper Rift Valley Lakes basin towards Upper Awash basin in the middle of the study area, along Ziway- Koka Lake and from Upper Awash to Rift Valley Lakes basin at west and east part of it. Key Words: Upper Awash River basin, Upper Rift Valley Lakes basin, Interbasin flow, Groundwater flow Modeling, Hydraulic head, TAGSAK en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Upper Awash River basin en_US
dc.subject Upper Rift Valley Lakes basin en_US
dc.subject Interbasin flow en_US
dc.subject Groundwater flow Modeling en_US
dc.subject Hydraulic head en_US
dc.subject Tagsak en_US
dc.title Interbasin Groundwater Transfer in Upper Rift Valley Lakes and Upper Awash River Basins en_US
dc.type Thesis en_US

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