Assessing soil erosion risk in a peri‑urban catchment of the Lake Victoria basin

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dc.contributor.authorSsewankambo, Gyaviira
dc.contributor.authorKabenge, Isa
dc.contributor.authorNakawuka, Prossie
dc.contributor.authorWanyama, Joshua
dc.contributor.authorZziwa, Ahamada
dc.contributor.authorBamutaze, Yazidhi
dc.contributor.authorGwapedza, David
dc.contributor.authorTally Palmer, Carolyn
dc.contributor.authorTanner, Jane
dc.contributor.authorMantel, Sukhmani
dc.contributor.authorTessema, Bezaye
dc.date.accessioned2022-11-01T11:46:08Z
dc.date.available2022-11-01T11:46:08Z
dc.date.issued2022
dc.description.abstractSoil erosion and sedimentation contribute to deteriorating water quality, adverse alterations in basin hydrology and overall ecosystem biogeochemistry. Thus, understanding soil erosion patterns in catchments is critical for conservation planning. This study was conducted in a peri-urban Inner Murchison Bay (IMB) catchment on the northern shores of Lake Victoria since most soil erosion studies in Sub-Saharan Africa have been focused on rural landscapes. The study sought to identify sediment sources by mapping erosion hotspots using the revised universal soil loss equation (RUSLE) model in appendage with field walks. RUSLE model was built in ArcGIS 10.5 software with factors including: rainfall erosivity, soil erodibility, slope length and steepness, land cover and support practices. The model was run, producing an erosion risk map and field assessments conducted to ground-truth findings and identify other hotspots. The percentage areas for RUSLE modelled erosion rates were: 66.8% for 0–2 t ha− 1 year− 1; 10.8% for 2–5 t ha− 1 year− 1; 10.1% for 5–10 t ha− 1 year− 1; 9% for 10–50 t ha− 1 year− 1 and 3.3% for 50–100 t ha− 1 year− 1. Average erosion risk was 7 t ha− 1 year− 1 and the total watershed erosion risk was 197,400 t year− 1, with croplands and steep areas (slope factor > 20) as the major hotspots (> 5 t ha− 1 year− 1). Field walks revealed exposed soils, marrum (gravel) roads and unlined drainage channels as other sediment sources. This study provided the first assessment of erosion risk in this peri-urban catchment, to serve as a basis for identifying mitigation priorities. It is recommended that tailored soil and water conservation measures be integrated into physical planning, focusing on identified non-conventional hotspots to ameliorate sediment pollution in Lake Victoria.en_US
dc.identifier.citationSsewankambo, G., Kabenge, I., Nakawuka, P., Wanyama, J., Zziwa, A., Bamutaze, Y., ... & Tessema, B. (2022). Assessing soil erosion risk in a peri-urban catchment of the Lake Victoria basin. Modeling Earth Systems and Environment , 1-17. https://doi.org/10.1007/s40808-022-01565-6en_US
dc.identifier.urihttps://doi.org/10.1007/s40808-022-01565-6
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/5105
dc.language.isoenen_US
dc.publisherModeling Earth Systems and Environmenten_US
dc.subjectLand use land coveren_US
dc.subjectInner Murchison Bay catchmenten_US
dc.subjectGeographical information systemen_US
dc.titleAssessing soil erosion risk in a peri‑urban catchment of the Lake Victoria basinen_US
dc.typeArticleen_US
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