Temporal and spatial variability of suspended sediment rating curves for rivers draining into the Ethiopian Rift Valley
Bibliographic Data
| ID | 21648631 |
|---|---|
| Authors | Alemayehu Kasaye Tilahun (0000-0002-5025-1575, Arba Minch University Institute of Water Technology Arba Minch Ethiopia, corresponding author), Gert Verstraeten (0000-0002-6529-7381, KU Leuven), Margaret Chen (0000-0001-5064-6158, Hydrology and Hydraulic Engineering Vrije Universiteit Brussel Brussels Belgium), Guchie Gulie (0009-0009-7910-7380, Arba Minch University Institute of Water Technology Arba Minch Ethiopia), Liuelsegad Belayneh (0000-0002-6947-3071, Department of Natural Resources Management Arba Minch University Arba Minch Ethiopia), Tizita Endale (0000-0002-6752-4533, Department of Natural Resources Management Arba Minch University Arba Minch Ethiopia) |
| Year | 2023 |
| Volume | 34 |
| Issue | 2 |
| Pages | 478-492 |
| Publication date | 2023-01-30 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Land Degradation and Development (JOURNAL) |
| Journal identifiers | ISSN: 1085-3278 • E-ISSN: 1099-145X |
| Publisher | Wiley (PUBLISHER • GB) |
| DOI | 10.1002/ldr.4473 |
| OpenAlex | W4296251864 |
| Language | EN |
| References cited | 42 |
Quantification of suspended sediment dynamics is a proxy for the intensity of soil erosion processes in a catchment. However, direct measurement of suspended sediments is difficult. Long‐term‐based discharge‐suspended sediment relationships often fail to provide sufficiently accurate results due to the temporal variations in sediment supply. This study evaluates temporal variations in suspended sediment‐discharge relations for six stations in two selected catchments within the Gamo Highlands in the southern Ethiopian Rift Valley. During a three‐year period (2018–2020), discharge was monitored at a 10‐min interval using a TD‐diver, while 1938 samples of suspended sediment concentration were taken at specific events. Observed suspended sediment concentration varied between 0.04 and 130 kg m −3 for discharge ranging between quasi‐zeros to 339 m 3 s −1 . The results show that pooled annual datasets lead to unsatisfying sediment rating curves and large errors in estimated sediment load. However, stratification of the data into three rainy season periods strongly improved the performance of the sediment rating curves. The development of a vegetative cover throughout the rainy season largely controls sediment supply from hillslopes to the river channel and hence the shape of the sediment rating curves. Furthermore, localized bank erosion and gully head dynamics also lead to important interannual changes in sediment rating curves within one river system, as well as between different rivers. Thus, attention should be given to possible errors due to high temporal and spatial variability while using discharge‐suspended sediment relations to quantify sediment load
Bank erosion · Discharge · Drainage basin · Erosion · Geography · Geomorphology · Rating curve · Sediment · Sediment transport · Wet season · Environmental Science · Hydrology and Sediment Transport Processes · Hydrology and Watershed Management Studies · Soil erosion and sediment transport · Ecology · Geology
| Citation velocity | historical |
|---|---|
| Highly cited | No |