Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia
This study aims to assess the impact of climate change on the water balance component of the Katar and Meki watersheds of the Central Rift Valley Lakes Basin, Ethiopia. The semi-distributed soil and water assessment tool hydrological model and multiple regional climate model outputs were used to ass...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-01-01
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| Series: | Journal of Water and Climate Change |
| Subjects: | |
| Online Access: | http://jwcc.iwaponline.com/content/14/1/175 |
| _version_ | 1797202847270436864 |
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| author | Sisay Kebede Balcha Adane Abebe Awass Taye Alemayehu Hulluka Amare Bantider Gebiaw T. Ayele |
| author_facet | Sisay Kebede Balcha Adane Abebe Awass Taye Alemayehu Hulluka Amare Bantider Gebiaw T. Ayele |
| author_sort | Sisay Kebede Balcha |
| collection | DOAJ |
| description | This study aims to assess the impact of climate change on the water balance component of the Katar and Meki watersheds of the Central Rift Valley Lakes Basin, Ethiopia. The semi-distributed soil and water assessment tool hydrological model and multiple regional climate model outputs were used to assess climate change impacts on water balance components and stream flow. Future climate scenarios were developed under a representative concentration pathway (RCP 4.5 and 8.5) for the 2040s (2021–2050) and 2070s (2051–2080). The study found that future annual and seasonal rainfall will show increasing and decreasing trends but that they are statistically insignificant. Furthermore, future temperatures show a significant increase in the subbasins. For the applied scenarios, an increasing and decreasing trend of future rainfall and increased temperatures would decrease the water yield by 4.9–15.3% at the Katar subbasin and 6.7–7.4% at the Meki subbasin. Furthermore, annual water yields will increase in the range of 0.38–57.1% and 6.57–49.9% for the Katar and Meki subbasins, respectively. The findings of this study will help basin planners, policymakers, and water resource managers develop appropriate adaptation strategies to mitigate the negative effects of climate change in the rift-bound lake system.
HIGHLIGHTS
The baseline and future rainfall show increasing and decreasing trends but are statistically not significant.;
The selected bias correction methods were significantly improved and add value to the RCMs outputs.;
Changes in the climate variables reduce the annual water yield and stream flow under all climate scenarios except RCP 4.5 by 2070.; |
| first_indexed | 2024-04-10T09:33:41Z |
| format | Article |
| id | doaj.art-e8dec5a579fd41e1af896eeaa0fc37a0 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-04-24T08:09:56Z |
| publishDate | 2023-01-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-e8dec5a579fd41e1af896eeaa0fc37a02024-04-17T08:12:38ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542023-01-0114117519910.2166/wcc.2022.249249Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, EthiopiaSisay Kebede Balcha0Adane Abebe Awass1Taye Alemayehu Hulluka2Amare Bantider3Gebiaw T. Ayele4 Ethiopian Institute of Water Resources, Addis Ababa University, P.O. BOX. 150461, Addis Ababa, Ethiopia Institute of Technology, Arba Minch University, P.O. BOX. 21, Arba Minch, Ethiopia Ethiopian Institute of Water Resources, Addis Ababa University, P.O. BOX. 150461, Addis Ababa, Ethiopia Ethiopian Institute of Water Resources, Addis Ababa University, P.O. BOX. 150461, Addis Ababa, Ethiopia Australian Rivers Institute, School of Engineering and Built Environment, Griffith University, Brisbane 4111, Australia This study aims to assess the impact of climate change on the water balance component of the Katar and Meki watersheds of the Central Rift Valley Lakes Basin, Ethiopia. The semi-distributed soil and water assessment tool hydrological model and multiple regional climate model outputs were used to assess climate change impacts on water balance components and stream flow. Future climate scenarios were developed under a representative concentration pathway (RCP 4.5 and 8.5) for the 2040s (2021–2050) and 2070s (2051–2080). The study found that future annual and seasonal rainfall will show increasing and decreasing trends but that they are statistically insignificant. Furthermore, future temperatures show a significant increase in the subbasins. For the applied scenarios, an increasing and decreasing trend of future rainfall and increased temperatures would decrease the water yield by 4.9–15.3% at the Katar subbasin and 6.7–7.4% at the Meki subbasin. Furthermore, annual water yields will increase in the range of 0.38–57.1% and 6.57–49.9% for the Katar and Meki subbasins, respectively. The findings of this study will help basin planners, policymakers, and water resource managers develop appropriate adaptation strategies to mitigate the negative effects of climate change in the rift-bound lake system. HIGHLIGHTS The baseline and future rainfall show increasing and decreasing trends but are statistically not significant.; The selected bias correction methods were significantly improved and add value to the RCMs outputs.; Changes in the climate variables reduce the annual water yield and stream flow under all climate scenarios except RCP 4.5 by 2070.;http://jwcc.iwaponline.com/content/14/1/175bias correctioncentral rift valley lakes basinclimate change impactwater balancewater yield |
| spellingShingle | Sisay Kebede Balcha Adane Abebe Awass Taye Alemayehu Hulluka Amare Bantider Gebiaw T. Ayele Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia Journal of Water and Climate Change bias correction central rift valley lakes basin climate change impact water balance water yield |
| title | Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia |
| title_full | Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia |
| title_fullStr | Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia |
| title_full_unstemmed | Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia |
| title_short | Assessment of future climate change impact on water balance components in Central Rift Valley Lakes Basin, Ethiopia |
| title_sort | assessment of future climate change impact on water balance components in central rift valley lakes basin ethiopia |
| topic | bias correction central rift valley lakes basin climate change impact water balance water yield |
| url | http://jwcc.iwaponline.com/content/14/1/175 |
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