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Universiteit Gent (2011)

Spatial and Temporal Simulation of Groundwater Recharge for Geba Catchment, Northern Ethiopia Using WetSpa

BEYENE Alemu Yenehun

Titre : Spatial and Temporal Simulation of Groundwater Recharge for Geba Catchment, Northern Ethiopia Using WetSpa

Auteur : BEYENE Alemu Yenehun

Université de soutenance : Universiteit Gent

Grade : Master of Science (MS) Physical Land Resources 2011

Résumé
A spatially distributed physical model WetSpa is applied to the Geba catchment (Northern Ethiopia) to simulate the spatial and temporal variation of groundwater recharge. It was simulated on a daily basis for about nearly four years (January 1, 2000 to December 18, 2003). It resulted in fair agreement of measured and simulated stream flow hydrographs when observed visually and from model performance indicators (bias = -2.54%, NS = 69.83%, NSL = 74.78% and NSH = 83.26%). It was also validated and a close performance value observed. According to the water balance calculation, about 3.76% of the total precipitation is intercepted by the plant canopy ; 87.51% infiltrates to the soil (out of which 13.02% percolates 2.74% laterally flow and 84.24% evapotranspired from the root zone), and 7.22% looses as surface runoff. The mean annual recharge value varies from about 45 mm (in 2003) to 207.5 mm (in 2001) which on average accounts for 98.6 mm per year for the whole study area. On a monthly basis, August is maximum (72.52 mm) and December is the minimum (with 0.08 mm). The mean annual groundwater recharge spatially varies from 0 to 371 mm. About 21% of Geba has a recharge amount of >120mm and 1% less than 5 mm. Soil type is the determing factor for the spatial variation of recharge. And rainfall is for its temporal variation and soil moisture content in lesser extent

Source : Pedon 23 - Physical Land Resources - Universiteit Gent

Page publiée le 6 novembre 2015, mise à jour le 12 décembre 2017