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Integrated hydrological model to evaluate water resources of Boteti River sub-basin, Botswana

Demissie, Wondimagegn Abebe (2022) Integrated hydrological model to evaluate water resources of Boteti River sub-basin, Botswana.

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Abstract:Boteti River sub-Basin (BRB) is located in Botswana's northwest and central districts, spanning 26,204 km2. BRB is located in a semi-arid to the arid region, with limited and highly variable rainfall and a high evapotranspiration rate, leading to limited surface water and groundwater resources. The Boteti River (BR) arises from the Okavango Delta overflow and stretches over 300 km to reach Lake Xau (LX). BR is characterized by erratic and unstable flow, which influences the downstream surface water resource (LX) and the groundwater resource. The basins' water resource is quantitatively evaluated in this study by developing an integrated hydrological model. A steady state IHM was built for the long-term model period (10 years) starting from 1st October 2010 to 30th September 2020 to assess the water resource of BRB using MODFLOW-6 quantitatively. Three major tasks were set for developing the IHM: 1) developing a hydrogeological conceptual model of BRB for identifying the boundary condition and hydrostratigraphic units of the numerical model; 2) applying remote sensing assessment for preparing an input Spatio-temporal input data such as precipitation, interception, potential evaporation, the lake area, volume, elevation and evaporation and 3) calibration of steady-state model using static water level and average stream discharge measurement.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Subject:01 general works, 02 science and culture in general, 43 environmental science
Programme:Geoinformation Science and Earth Observation MSc (75014)
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