Hydro-geomorphological characterization of Dhidhessa River Basin, Ethiopia
Hydro-geomorphological characterization of Dhidhessa River Basin, Ethiopia
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埃塞俄比亚迪德萨河流域水文地貌特征
DOI：
10.1016/j.iswcr.2018.02.003
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发表时间：
2018
影响因子：
6.4
通讯作者：
B. Gessesse
中科院分区：
文献类型：
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作者：
Gizachew Kabite;B. Gessesse
Dhidhessa河流域在青尼罗河流域具有重要的地理和水文意义，然而，其形态和水文尚不为人所知。本研究旨在通过盆地形态分析表征该盆地的水文地貌特征。在ArcGIS 10.3环境下，采用SRTM DEM和该地区的地质水文图进行分析。结果表明：在28637 km2的流域范围内，各目河流总长度为33468 km，呈树枝状分布；根据形态计量学参数分类，流域总流长和流序高，而流长比、分岔比和水文蓄水系数低。流域面积大，排水频率粗，流域形状较拉长，排水密度中等，入渗数低，坡面流长，河道保持常数高。盆地的起伏度、起伏比、崎岖数、坡度比和坡度均较高。总的来说，该研究认为，该盆地的底部是均匀的耐蚀岩石，不易发生洪水，水资源潜力大，易受土壤侵蚀。本研究采用的形态计量学分析方法对盆地特征具有成本效益和时间效益。
Dhidhessa River Basin is physio-graphically and hydrologically important in the Blue Nile basin, however, its morphometry and hydrology are not well known. This study aimed to characterize hydro-geomorphology of the basin via basin morphometry analysis. SRTM DEM, geological and hydrological maps of the area were used in ArcGIS 10.3 environment for this analysis. Results showed that a 33,468 km total stream length of all orders was found distributed within 28,637 km2drainage area in a dendritic pattern. According to morphometric parameter classification, total stream length and stream order of the basin were high whereas stream length ratio, bifurcation ratio and hydrologic storage coefficient were low. Furthermore, drainage area was large, drainage frequency was coarse, basin shape was more elongated, drainage density was medium, infiltration number was low, overland flow was long and constant of channel maintenance was high. Moreover, the basin's relief, relief ratio, ruggedness number, gradient ratio and the slope was high. In general, the study asserted that the basin was underlain by uniform resistant rocks, less prone to flooding, with high water resources potential and susceptible to soil erosion. The morphometric analysis approach pursued in this study was cost- and time-effective for basin characterization.