TITLE:
Assessment of Soil Erosion and Sediment Transfer Using the InVEST-SDR Model: A Case Study of the Lobo Watershed
AUTHORS:
Kouakou Jean-Claude Tanoh, Kouakou Hervé Kouassi, Kouamé Elyass Kanga, Jean Philippe Attoungbré Deguy, Yao Emile Desmond Konan, Vanessa Mariame Nonde, Serge Armel Gbaho
KEYWORDS:
Lobo Watershed, InVEST-SDR, Soil Erosion, Sediment Transfer, Soubré Dam, Reservoir Sedimentation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.9,
September
28,
2026
ABSTRACT: Sediment transfer represents a major challenge for the sustainability of hydroelectric reservoirs, particularly in watersheds subject to intense anthropogenic pressure. This study aims to spatially characterize erosion and sediment transfer processes in the Lobo watershed and to assess their potential contribution to sedimentation in the Soubré hydroelectric reservoir. The approach combines the InVEST-SDR model, the RUSLE equation, Geographic Information Systems (GIS), remote sensing, and field observations. The results indicate an estimated mean soil loss of 21.24 t·ha−1·yr−1, with low erosion levels predominating across 87.44% of the watershed. The estimated mean sediment transfer reaches 8.12 t·ha−1·yr−1, corresponding to approximately 38% of soil loss, while 62% of the eroded material is temporarily retained on hillslopes or in intermediate depositional areas. High Sediment Delivery Ratio (SDR) values are mainly concentrated along the drainage network, tributaries, and steep-slope areas, identifying these zones as preferential pathways for sediment transfer to streams. Agricultural areas, bare soils, and mining sites appear to be significant potential sources of sediment.