Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal
Study region: The middle hilly region of the Koshi River Basin in Nepal. Study focus: Assessment is made of the hydrological regime of the basin under climate change. Results from two Regional Climate Models (PRECIS-HADCM3Q0 and PRECIS-ECHAM05), based on IPCC-SRES A1B scenario, were bias corrected a...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-09-01
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| Series: | Journal of Hydrology: Regional Studies |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581815000889 |
| _version_ | 1828437362193989632 |
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| author | Laxmi Prasad Devkota Dhiraj Raj Gyawali |
| author_facet | Laxmi Prasad Devkota Dhiraj Raj Gyawali |
| author_sort | Laxmi Prasad Devkota |
| collection | DOAJ |
| description | Study region: The middle hilly region of the Koshi River Basin in Nepal.
Study focus: Assessment is made of the hydrological regime of the basin under climate change. Results from two Regional Climate Models (PRECIS-HADCM3Q0 and PRECIS-ECHAM05), based on IPCC-SRES A1B scenario, were bias corrected against historical gauged data. Hydrological impact simulations were conducted using SWAT model. Design flood estimation was done after extreme value analysis based on annual flow maxima.
New hydrological insights for the region: The study found that climate change does not pose major threat on average water availability. However, temporal flow variations are expected to increase in the future. The magnitude of projected flow for given return periods, however, strongly depends on the climate model run considered. The ECHAM05 results show higher flow changes than those estimated from the HADCM3 outputs. A relation was derived to estimate projected flood flow as a function of return period and flow estimated from historical series. Amidst the uncertainties, these predictions provide reasonable insight for re-consideration of design standards or design values of hydraulic structures under climate change. |
| first_indexed | 2024-12-10T19:45:27Z |
| format | Article |
| id | doaj.art-3948d70bf43d4bb2afe338b06482d8f4 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-12-10T19:45:27Z |
| publishDate | 2015-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-3948d70bf43d4bb2afe338b06482d8f42022-12-22T01:35:54ZengElsevierJournal of Hydrology: Regional Studies2214-58182015-09-014PB50251510.1016/j.ejrh.2015.06.023Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, NepalLaxmi Prasad DevkotaDhiraj Raj GyawaliStudy region: The middle hilly region of the Koshi River Basin in Nepal. Study focus: Assessment is made of the hydrological regime of the basin under climate change. Results from two Regional Climate Models (PRECIS-HADCM3Q0 and PRECIS-ECHAM05), based on IPCC-SRES A1B scenario, were bias corrected against historical gauged data. Hydrological impact simulations were conducted using SWAT model. Design flood estimation was done after extreme value analysis based on annual flow maxima. New hydrological insights for the region: The study found that climate change does not pose major threat on average water availability. However, temporal flow variations are expected to increase in the future. The magnitude of projected flow for given return periods, however, strongly depends on the climate model run considered. The ECHAM05 results show higher flow changes than those estimated from the HADCM3 outputs. A relation was derived to estimate projected flood flow as a function of return period and flow estimated from historical series. Amidst the uncertainties, these predictions provide reasonable insight for re-consideration of design standards or design values of hydraulic structures under climate change.http://www.sciencedirect.com/science/article/pii/S2214581815000889Koshi BasinSWAT modelingClimate changeDesign standardDesign valuesUncertainties |
| spellingShingle | Laxmi Prasad Devkota Dhiraj Raj Gyawali Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal Journal of Hydrology: Regional Studies Koshi Basin SWAT modeling Climate change Design standard Design values Uncertainties |
| title | Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal |
| title_full | Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal |
| title_fullStr | Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal |
| title_full_unstemmed | Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal |
| title_short | Impacts of climate change on hydrological regime and water resources management of the Koshi River Basin, Nepal |
| title_sort | impacts of climate change on hydrological regime and water resources management of the koshi river basin nepal |
| topic | Koshi Basin SWAT modeling Climate change Design standard Design values Uncertainties |
| url | http://www.sciencedirect.com/science/article/pii/S2214581815000889 |
| work_keys_str_mv | AT laxmiprasaddevkota impactsofclimatechangeonhydrologicalregimeandwaterresourcesmanagementofthekoshiriverbasinnepal AT dhirajrajgyawali impactsofclimatechangeonhydrologicalregimeandwaterresourcesmanagementofthekoshiriverbasinnepal |