Water Balance Components Estimation using WetSpass Model: A Case study of Mekelle Area, Tigray, Ethiopia

Physical Science International Journal Pub Date : 2023-08-04 DOI:10.9734/psij/2023/v27i3793

Kahsay Hailekiros, Tesfamichael Gebreyohannes, Abdelwassie Hussein, Hagos Brhane

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Abstract

This research was aimed at estimating the spatially distributed Water balance components of the catchments in Mekelle area by using WetSpass hydrological model and verifying the model outputs with ground truth. Long term mean metrological data and physical characteristics of the catchments were used as an input to the model. The input data were manipulated using Arc- GIS tools. Results of this model depicted that about 73.13% and 19.96% of the precipitation in the study area was lost through evapotranspiration and surface runoff respectively. However, 7% of it replenished the groundwater. The annual runoff and groundwater recharge estimated in WetSpass model accumulated using Arc-GIS were verified using the annual runoff gauged records and base flow measurements. Accordingly the accumulated runoff and base flow derived from the WetSpass model using Arc-GIS software results were quite close to the observed runoff and base flow values measured in the gauging points. Therefore, WetSpass model is appropriate model in estimating water balance components in the study area.

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基于WetSpass模型的水平衡成分估算——以埃塞俄比亚提格雷Mekelle地区为例

本研究旨在利用WetSpass水文模型估算Mekelle地区流域水平衡分量的空间分布，并与地面真实值验证模型输出结果。长期平均气象数据和集水区的物理特征被用作模型的输入。使用Arc- GIS工具对输入数据进行处理。模型结果显示，研究区通过蒸散发和地表径流损失的降水分别约为73.13%和19.96%。然而，其中的7%补充了地下水。利用Arc-GIS积累的wespass模型估算的年径流和地下水补给，使用年径流测量记录和基流测量进行了验证。因此，利用Arc-GIS软件利用wespass模型得到的累积径流和基流结果与测量点的观测径流和基流值非常接近。因此，wespass模型是估算研究区水平衡分量的合适模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Physical Science International Journal

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