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Nigerian Journal of Technological Research

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Distribution of soil erosion sensitive area in Guna-Tana watershed, Blue Nile, Basin Ethiopia

Asirat Teshome Tolosa, Afera Halefom Teka, Biruk Shewayirga Belay

Abstract


The main objective of this study was to identify the most vulnerable areas to soil erosion in Guna-Tana watershed, Blue Nile basin; Ethiopia by using the Geographic Information System based decision support system use that of multi-criteria evaluation (MCE). This study focus on the identification of soil erosion-prone areas in Guna-Tana watershed (area: 3528 sq km), which drains overall catchment to Lake Tana. Using the MCE analysis, an attempt was made to combine a set of factors (land use, soil, slope, Rainfall, altitude, and TWI) to make a decision according to the stated objective. Raster-based pairwise comparison methods considering six soil erosion driving parameters have been done in ArcGIS 10.3 environments. MCE is used to quantify the raster-based qualitative spatial erosion vulnerable model produced through pairwise comparison. Raster-based spatial model reveals that out of total watershed area, 202.84 sq km (5.75%), 227.65sq km (6.45%), 1091.02sq km (30.93%), 1681.99sq km (47.68%) and 324.03sq km (9.19%) areas are extremely sensitive, Highly sensitive, Moderately sensitive, Marginally sensitive and Less sensitive prone to soil erosion respectively. The results of this research can help decision-makers and policy-makers identify the "hotspots" of soil erosion and the relevant soil and water  conservation measures.

Keywords: Soil erosion; Guna-Tana watershed; MCE; GIS; Pairwise comparison; Ethiopia




http://dx.doi.org/10.4314/njtr.v14i2.3
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