Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia
Due to the rapid socio-economic development in the Ethiopian Rift Valley basin, the pressures on water resources are increasing. To understand the change of spatio-temporal water fluxes, the hydrologic model SWAT+ (Soil and Water Assessment Tool+) was applied to five selected watersheds within the b...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-08-01
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| Series: | Journal of Water and Climate Change |
| Subjects: | |
| Online Access: | http://jwcc.iwaponline.com/content/14/8/2788 |
| _version_ | 1797202738742820864 |
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| author | Ayenew D. Ayalew Paul D. Wagner Tibebe B. Tigabu Dejene Sahlu Nicola Fohrer |
| author_facet | Ayenew D. Ayalew Paul D. Wagner Tibebe B. Tigabu Dejene Sahlu Nicola Fohrer |
| author_sort | Ayenew D. Ayalew |
| collection | DOAJ |
| description | Due to the rapid socio-economic development in the Ethiopian Rift Valley basin, the pressures on water resources are increasing. To understand the change of spatio-temporal water fluxes, the hydrologic model SWAT+ (Soil and Water Assessment Tool+) was applied to five selected watersheds within the basin. With regards to the objective functions, Kling–Gupta efficiency (KGE: 0.68–0.84), the Nash–Sutcliffe efficiency (NSE: 0.61–0.73), percent bias (PBIAS: −3.4 to 1.4), and RMSE-observations standard deviation ratio (RSR: 0.52–0.69), the SWAT+ model performed very well for daily streamflow in all watersheds. The change in water balance components indicated a considerable spatial variation of water fluxes in the watersheds. Precipitation, evapotranspiration, and infiltration have generally decreased, but surface runoff has increased in the interference period compared to the baseline period. The spatial distribution of rainfall (−40 to 10%), evapotranspiration (−20 to 5%), surface runoff (7.8–13.1%), lateral flow (4.47 to −16.5%), and percolation (−3.3 to −10.2%) varied. The changes in the hydrologic system within the basin are greatly attributed to the combination of land use and land cover change due to rapid population growth and climate variability.
HIGHLIGHTS
Examines the combined and isolated impacts of LULC change and climate dynamics on hydrological processes.;
LULC change associated with rapid population growth and climate variability are significant drivers of changes in the hydrologic system.;
The methodology employed in the study can serve as a valuable model for similar studies in other regions, and it contributes to the existing literature on hydrological responses.; |
| first_indexed | 2024-03-12T01:45:19Z |
| format | Article |
| id | doaj.art-4e88d16497ed44af9ca1629a21403f27 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-04-24T08:08:13Z |
| publishDate | 2023-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-4e88d16497ed44af9ca1629a21403f272024-04-17T08:30:55ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542023-08-011482788280710.2166/wcc.2023.138138Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, EthiopiaAyenew D. Ayalew0Paul D. Wagner1Tibebe B. Tigabu2Dejene Sahlu3Nicola Fohrer4 Department of Hydrology and Water Resources Management, Christian-Albrechts-University, Kiel, Germany Department of Hydrology and Water Resources Management, Christian-Albrechts-University, Kiel, Germany Department of Land, Air and Water Resources, University of California, Davis, Davis, CA, USA Institute of Disaster Risk Management and Food Security Studies, Bahir Dar University, Bahir Dar, Ethiopia Department of Hydrology and Water Resources Management, Christian-Albrechts-University, Kiel, Germany Due to the rapid socio-economic development in the Ethiopian Rift Valley basin, the pressures on water resources are increasing. To understand the change of spatio-temporal water fluxes, the hydrologic model SWAT+ (Soil and Water Assessment Tool+) was applied to five selected watersheds within the basin. With regards to the objective functions, Kling–Gupta efficiency (KGE: 0.68–0.84), the Nash–Sutcliffe efficiency (NSE: 0.61–0.73), percent bias (PBIAS: −3.4 to 1.4), and RMSE-observations standard deviation ratio (RSR: 0.52–0.69), the SWAT+ model performed very well for daily streamflow in all watersheds. The change in water balance components indicated a considerable spatial variation of water fluxes in the watersheds. Precipitation, evapotranspiration, and infiltration have generally decreased, but surface runoff has increased in the interference period compared to the baseline period. The spatial distribution of rainfall (−40 to 10%), evapotranspiration (−20 to 5%), surface runoff (7.8–13.1%), lateral flow (4.47 to −16.5%), and percolation (−3.3 to −10.2%) varied. The changes in the hydrologic system within the basin are greatly attributed to the combination of land use and land cover change due to rapid population growth and climate variability. HIGHLIGHTS Examines the combined and isolated impacts of LULC change and climate dynamics on hydrological processes.; LULC change associated with rapid population growth and climate variability are significant drivers of changes in the hydrologic system.; The methodology employed in the study can serve as a valuable model for similar studies in other regions, and it contributes to the existing literature on hydrological responses.;http://jwcc.iwaponline.com/content/14/8/2788attributionclimate dynamicscombined impacthydrological responseland use and land cover changerift valleyswat + |
| spellingShingle | Ayenew D. Ayalew Paul D. Wagner Tibebe B. Tigabu Dejene Sahlu Nicola Fohrer Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia Journal of Water and Climate Change attribution climate dynamics combined impact hydrological response land use and land cover change rift valley swat + |
| title | Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia |
| title_full | Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia |
| title_fullStr | Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia |
| title_full_unstemmed | Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia |
| title_short | Hydrological responses to land use and land cover change and climate dynamics in the Rift Valley Lakes Basin, Ethiopia |
| title_sort | hydrological responses to land use and land cover change and climate dynamics in the rift valley lakes basin ethiopia |
| topic | attribution climate dynamics combined impact hydrological response land use and land cover change rift valley swat + |
| url | http://jwcc.iwaponline.com/content/14/8/2788 |
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