Responses of surface runoff and soil water-erosion to changes in seasonal land cover and rainfall intensity; the case of Shilansha Watershed, Rift Valley Basin of Ethiopia

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dc.creatorGedle, Assefa
dc.creatorRientjes, T.
dc.creatorHaile, Alemseged Tamiru
dc.creatorMekuria, Wolde
dc.creatorHallett, P.
dc.creatorSmith, J.
dc.date2025-04
dc.date2025-03-27T05:27:37Z
dc.date2025-03-27T05:27:37Z
dc.date.accessioned2026-06-27T18:42:26Z
dc.descriptionStudy Region: Shilansha is a watershed located in the Upper Bilate River of the Rift Valley Lake Basin in southern Ethiopia. The region experiences extreme soil water-erosion among the greatest rates globally at 498 tons ha- 1 yr- 1 leading to large quantities of sediment accumulation in Lake Abaya. Study Focus: Surface runoff, soil water-erosion, and sediment loads in the region vary with agricultural seasons and rainfall intensities but are often poorly quantified in modeling studies. This study assessed these effects using the event-based physically based distributed open-source Limburg Soil Water Erosion Model (OpenLISEM), incorporating local field data and multi-sensor satellite data processed with machine learning techniques. New Hydrological Insights: During the fallow season, simulated surface runoff and total soil loss were 9.7 % and 47 % larger than the growing season and 0.9 % and 42 % larger than the harvest season, respectively. Compared to moderate intensity, an 87 % increase in high rainfall intensity increased surface runoff by 159 % and soil loss by 295 %, while a 45 % decrease in low rainfall intensity reduced surface runoff by 49 % and soil loss by 85 %. High rainfall intensity had a greater impact when combined with fallow season land cover, while effects were smallest when low rainfall intensity combined with growing season land cover. A calibrated model parameter set for a particular season resulted in deteriorated model performance when applied to other seasons. These findings offer insights on the importance of considering seasonal changes in land cover and rainfall intensity when developing soil and water conservation strategies.
dc.identifierhttps://hdl.handle.net/10568/173888
dc.identifier.urihttp://hdl.handle.net/123456789/163256
dc.languageen
dc.publisherElsevier
dc.rightsOpen Access
dc.sourceGedle, Assefa; Rientjes, T.; Haile, Alemseged Tamiru; Mekuria, Wolde; Hallett, P.; Smith, J. 2025. Responses of surface runoff and soil water-erosion to changes in seasonal land cover and rainfall intensity; the case of Shilansha Watershed, Rift Valley Basin of Ethiopia. Journal of Hydrology: Regional Studies, 58:102289. [doi: https://doi.org/10.1016/j.ejrh.2025.102289]
dc.subjectrunoff
dc.subjectsoil water
dc.subjecterosion
dc.subjectland cover
dc.subjectrainfall
dc.subjectwatersheds
dc.subjectsediment load
dc.subjectmodels
dc.titleResponses of surface runoff and soil water-erosion to changes in seasonal land cover and rainfall intensity; the case of Shilansha Watershed, Rift Valley Basin of Ethiopia
dc.typeJournal Article

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