Evaluation of climate change effects on flood frequency in arid and semi-arid basins
Climate change (CC) will increase the intensity of extreme phenomena such as drought and flood in arid and semi-arid regions. This will cause the water supply of these areas to become very difficult in times of crisis. This study identifies sub-basins with high flood potential in the baseline period...
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Veröffentlicht in: | Water science & technology. Water supply 2022-08, Vol.22 (8), p.6740-6755 |
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Sprache: | eng |
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Zusammenfassung: | Climate change (CC) will increase the intensity of extreme phenomena such as drought and flood in arid and semi-arid regions. This will cause the water supply of these areas to become very difficult in times of crisis. This study identifies sub-basins with high flood potential in the baseline period (1982–2005) and the future period (2025–2048) in the Hablehroud basin, north-central Iran. It uses the soil and water assessment tool (SWAT) and 23 coupled model intercomparison project 5 (CMIP5) general circulation models (GCMs). It estimates the instantaneous peak flow (IPF) and uses a flood index (FI) to determine the contributions of each sub-basin to the floods. The rainfall of the basin will increase by 11.5% under representative concentration pathway (RCP) 4.5 and 12.6% under RCP 8.5. The minimum daily temperature (Tmin) of the basin will increase by 0.8 °C under RCP 4.5 and 1.1 °C under RCP 8.5 in the future period. In addition, the maximum daily temperature (Tmax) will rise by 1 °C under RCP 4.5 and 1.2 °C under RCP 8.5. Moreover, basin runoff will increase by 6.4% under RCP 4.5 and 11.6% under RCP 8.5. The results indicate that the central and southern sub-basins made the most significant contribution to floods in the baseline period, while the eastern sub-basins will make the most considerable contribution to future floods. |
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ISSN: | 1606-9749 1607-0798 |
DOI: | 10.2166/ws.2022.271 |