Your search found 2 records
1 Nyssen, J.; Poesen, J.; Descheemaeker, Katrien; Haregeweyn, N.; Haile, M.; Moeyersons, J.; Frankl, A.; Govers, G.; Munro, N.; Deckers, J. 2008. Effects of region-wide soil and water conservation in semi-arid areas: the case of northern Ethiopia. Zeitschrift für Geomorphologie, 52(3):291-315.
Soil conservation ; Water conservation ; Highlands ; Erosion ; Bunds ; Reservoirs ; Sedimentation / Ethiopia / Tigray
(Location: IWMI HQ Call no: e-copy only Record No: H041844)
(0.94 MB)
Studies on the impacts of environmental rehabilitation in semi-arid areas are often conducted over limited space and time scales, and do typically not include detailed biophysical components. This study makes a multi-scale assessment over a time span of 30 years of environmental rehabilitation in one of the world's most degraded areas: the Tigray highlands of Northern Ethiopia. The study shows that in Tigray sheet and rill erosion rates have decreased by approximately 68%, infiltration and spring discharge are enhanced and vegetation cover has improved. These impacts are evidenced and quantified by a comprehensive comparison of the current landscape with a coverage of 30-year old photographs and substantiated by field investigations. The positive changes in ecosystem service supply that result from these conservation activities in the Tigray highlands are an issue of global concern.
2 Assaye, H.; Nyssen, J.; Poesen, J.; Lemma, H.; Meshesha, D. T.; Wassie, A.; Adgo, E.; Frankl, A.. 2021. Curve number calibration for measuring impacts of land management in sub-humid Ethiopia. Journal of Hydrology: Regional Studies, 35:100819. [doi: https://doi.org/10.1016/j.ejrh.2021.100819]
Land management ; Subhumid zones ; Catchment areas ; Land use ; Land cover ; Farmland ; Hydrology ; Forecasting ; Models ; Rain ; Runoff ; Soil erosion ; Vegetation / Ethiopia / Lake Tana Basin / Enkulal Catchment
(Location: IWMI HQ Call no: e-copy only Record No: H050402)
https://www.sciencedirect.com/science/article/pii/S2214581821000483/pdfft?md5=811f24334ecf439a5dd45030e6fb5ebc&pid=1-s2.0-S2214581821000483-main.pdf
https://vlibrary.iwmi.org/pdf/H050402.pdf
https://vlibrary.iwmi.org/pdf/H050402.pdf
(7.40 MB) (7.40 MB)
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 ( ) 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.
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 ( ) 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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