دورية أكاديمية
Curve number calibration for measuring impacts of land management in sub-humid Ethiopia
| العنوان: | Curve number calibration for measuring impacts of land management in sub-humid Ethiopia |
|---|---|
| المؤلفون: | Habtamu Assaye, Jan Nyssen, Jean Poesen, Hanibal Lemma, Derege Tsegaye Meshesha, Alemayehu Wassie, Enyew Adgo, Amaury Frankl |
| المصدر: | Journal of Hydrology: Regional Studies, Vol 35, Iss , Pp 100819- (2021) |
| بيانات النشر: | Elsevier, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Physical geography LCC:Geology |
| مصطلحات موضوعية: | Abstraction ratio, Catchment, Curve number, Event-based runoff, Lake Tana Basin, Physical geography, GB3-5030, Geology, QE1-996.5 |
| الوصف: | 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2214-5818 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S2214581821000483; https://doaj.org/toc/2214-5818 |
| DOI: | 10.1016/j.ejrh.2021.100819 |
| URL الوصول: | https://doaj.org/article/b3bce55e788f4917ba247b11b91a9718 |
| رقم الأكسشن: | edsdoj.b3bce55e788f4917ba247b11b91a9718 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 22145818 |
|---|---|
| DOI: | 10.1016/j.ejrh.2021.100819 |