Curve number calibration for measuring impacts of land management in sub-humid Ethiopia - Botanique et bio-informatique de l'architecture des plantes et des végétations Accéder directement au contenu
Article Dans Une Revue Journal of Hydrology: Regional Studies Année : 2021

Curve number calibration for measuring impacts of land management in sub-humid Ethiopia

Résumé

Study Region We investigate the event runoff response in six sub-catchments in the Lake Tana sub-basin, headwater of the Blue Nile basin, northwest Ethiopia. Steep and mountainous terrains surround floodplains, imposing runoff and soil erosion in the upper catchments and flooding and sedimentation at floodplains. This study was conducted in the upland runoff source catchments. Study Focus The focus is to investigate catchment characteristics that control the event runoff response in upland catchments, and how recent land management practices may have contributed to improved hydrological conditions. Event rainfall and runoff data were obtained at five-minute time steps through automated divers and tipping bucket rain gauges and related to catchment characteristics. New Hydrological Insights for the Region Our results show that the catchment event quickflow response was controlled by different factors of both natural and anthropogenic nature of which forest and shrubs, bund density and soil organic matter content were found to be the most important to reduce event quickflow. On the contrary, increase in cropland area caused an increase in quickflow. Through least square fitting procedure of the Natural Resources Conservation Service Curve Number method (NRCS-CN), a site specific abstraction ratio (λ) value of 0.01, rather than the commonly used 0.2 or 0.05, was found to be most appropriate for the sub-humid highlands of Ethiopia.
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Origine : Publication financée par une institution

Dates et versions

hal-03197727 , version 1 (14-04-2021)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Habtamu Assaye, Jan Nyssen, Jean Poesen, Hanibal Lemma, Derege Tsegaye Meshesha, et al.. Curve number calibration for measuring impacts of land management in sub-humid Ethiopia. Journal of Hydrology: Regional Studies, 2021, 35, ⟨10.1016/j.ejrh.2021.100819⟩. ⟨hal-03197727⟩
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