Soil loss estimation and mapping of water erosion management strategies in the Northern region of Rwanda
2025
Nizeyimana, Martin | Mukamusoni, Marie Claire | Bukombe, Benjamin | Naramabuye, Francois Xavier
This study was conducted in Gakenke, Musanze and Rulindo districts in northern province of Rwanda from December 2019 to October 2021 to determine Soil and Water Conservation (SWC) status, mapping soil erosion areas, annual estimation of soil loss and spatial distribution in northern Rwanda. The study used Revised Universal Soil Loss Equation (RUSLE) model based on erosivity index, erodibility of soil, slope steepness, slope distance, vegetation covers and conservation practice parameters generated through arc GIS. The utilized data included the Digital Elevation Model (DEM) for production of slope steepness. Landsat 8 have been processed in ERDAS Imagine 2014 for land use and land cover. Field data for conservation practice factor and rainfall data for soil erosivity in Google Earth Pro and ArcGIS respectively have been produced. The results indicated that the forest was identified as the largest area covering of 84.08% followed by built up areas with 10.43%, radical terraces account for 4.45 %, bare soil (3.23%), agroforestry (0.77%), waterbodies (0.727%), riverbanks (0.38%), and wetland (0.35%). The average rate of water erosion was discovered as 72 t. ha–1. y–1 and observed that soil erosion is more severe in steep areas than in other places. Inadequate erosion control management results as the cause of spatial distribution of erosion. Thus, it is advisable to prioritize soil and water management practices in steep and mid-elevation unprotected areas before applying them to lower elevations.
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