Evaluation of the Impacts of Climate Change on Sediment Yield from the Logiya Watershed, Lower Awash Basin, Ethiopia
| Autor: | Fiseha Behulu, Gezahegn Weldu Woldemariam, Arus Edo Harka, Bogale Gebremariam, Nura Boru Jilo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Hydrology
Watershed Coefficient of determination Soil and Water Assessment Tool CORDEX-Africa Climate change Structural basin Oceanography sediment yield climate change RCP Evapotranspiration Environmental science lcsh:Q Logiya watershed SWAT Precipitation lcsh:Science Waste Management and Disposal Earth-Surface Processes Water Science and Technology Downscaling |
| Zdroj: | Hydrology Volume 6 Issue 3 Hydrology, Vol 6, Iss 3, p 81 (2019) |
| ISSN: | 2306-5338 |
| DOI: | 10.3390/hydrology6030081 |
| Popis: | It is anticipated that climate change will impact sediment yield in watersheds. The purpose of this study was to investigate the impacts of climate change on sediment yield from the Logiya watershed in the lower Awash Basin, Ethiopia. Here, we used the coordinated regional climate downscaling experiment (CORDEX)-Africa data outputs of Hadley Global Environment Model 2-Earth System (HadGEM2-ES) under representative concentration pathway (RCP) scenarios (RCP4.5 and RCP8.5). Future scenarios of climate change were analyzed in two-time frames: 2020&ndash 2049 (2030s) and 2050&ndash 2079 (2060s). Both time frames were analyzed using both RCP scenarios from the baseline period (1971&ndash 2000). A Soil and Water Assessment Tool (SWAT) model was constructed to simulate the hydrological and the sedimentological responses to climate change. The model performance was calibrated and validated using the coefficient of determination (R2), Nash&ndash Sutcliffe efficiency (NSE), and percent bias (PBIAS). The results of the calibration and the validation of the sediment yield R2, NSE, and PBIAS were 0.83, 0.79, and &minus 23.4 and 0.85, 0.76, and &minus 25.0, respectively. The results of downscaled precipitation, temperature, and estimated evapotranspiration increased in both emission scenarios. These climate variable increments were expected to result in intensifications in the mean annual sediment yield of 4.42% and 8.08% for RCP4.5 and 7.19% and 10.79% for RCP8.5 by the 2030s and the 2060s, respectively. |
| Databáze: | OpenAIRE |
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