ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL
This study details climate change assessment of the hydrological regime of Indrawati basin of Nepal. The study uses Soil and Water Assessment Tool (SWAT) model to delineate, discretize and parameterize the Indrawati basin to compute model’s input parameters. The model was then run for 1990–2014 to s...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2019-12-01
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| Series: | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/IV-5-W2/1/2019/isprs-annals-IV-5-W2-1-2019.pdf |
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| author | B. Bade D. R. Gyawali S. Timilsina |
| author_facet | B. Bade D. R. Gyawali S. Timilsina |
| author_sort | B. Bade |
| collection | DOAJ |
| description | This study details climate change assessment of the hydrological regime of Indrawati basin of Nepal. The study uses Soil and Water Assessment Tool (SWAT) model to delineate, discretize and parameterize the Indrawati basin to compute model’s input parameters. The model was then run for 1990–2014 to simulate the discharge at the outlet (Dholalghat). The coefficient of determination <i>R</i><sup>2</sup> and Nash-Sutcliffe (ENS) were used to evaluate model calibration and validation. The results found were satisfactory for the gauging station <i>R</i><sup>2</sup> = 0.951 and ENS = 0.901 for calibration and <i>R</i><sup>2</sup> = 0.937 and. ENS = 0.906 for validation. The calibrated hydrological model was run for the future climate change scenario using the RegCM4-LMDZ4 data and the relative changes with the baseline scenarios were analyzed. The comparison suggests that the historical trend of flow is decreasing at the rate of 0.55 m<sup>3</sup>/s per year. According to RegCM4-LMDZ4 simulations, the trend is going to continue but at a flatter rate. The decreasing trend is observed to be very less. The characteristic peak flow month in the historical scenario is August but the RegCM4-LMDZ4 led simulated flows suggest a shift in monthly peak to October suggesting decrease in monsoon flows and a subsequent significant increase in flows from October to January. |
| first_indexed | 2024-04-11T23:05:17Z |
| format | Article |
| id | doaj.art-4d1e0b9d4aac46d8a17751e51896fe24 |
| institution | Directory Open Access Journal |
| issn | 2194-9042 2194-9050 |
| language | English |
| last_indexed | 2024-04-11T23:05:17Z |
| publishDate | 2019-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-4d1e0b9d4aac46d8a17751e51896fe242022-12-22T03:58:02ZengCopernicus PublicationsISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences2194-90422194-90502019-12-01IV-5-W21810.5194/isprs-annals-IV-5-W2-1-2019ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPALB. Bade0D. R. Gyawali1S. Timilsina2GIS Developer, International Maize and Wheat Improvement Center (CIMMYT), Lalitpur, NepalData Analyst (Spatial Modeling), United Nations World Food Programme (UNWFP), Kathmandu, NepalGIS Analyst, Nepal Development Research Institute (NDRI), Lalitpur, NepalThis study details climate change assessment of the hydrological regime of Indrawati basin of Nepal. The study uses Soil and Water Assessment Tool (SWAT) model to delineate, discretize and parameterize the Indrawati basin to compute model’s input parameters. The model was then run for 1990–2014 to simulate the discharge at the outlet (Dholalghat). The coefficient of determination <i>R</i><sup>2</sup> and Nash-Sutcliffe (ENS) were used to evaluate model calibration and validation. The results found were satisfactory for the gauging station <i>R</i><sup>2</sup> = 0.951 and ENS = 0.901 for calibration and <i>R</i><sup>2</sup> = 0.937 and. ENS = 0.906 for validation. The calibrated hydrological model was run for the future climate change scenario using the RegCM4-LMDZ4 data and the relative changes with the baseline scenarios were analyzed. The comparison suggests that the historical trend of flow is decreasing at the rate of 0.55 m<sup>3</sup>/s per year. According to RegCM4-LMDZ4 simulations, the trend is going to continue but at a flatter rate. The decreasing trend is observed to be very less. The characteristic peak flow month in the historical scenario is August but the RegCM4-LMDZ4 led simulated flows suggest a shift in monthly peak to October suggesting decrease in monsoon flows and a subsequent significant increase in flows from October to January.https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/IV-5-W2/1/2019/isprs-annals-IV-5-W2-1-2019.pdf |
| spellingShingle | B. Bade D. R. Gyawali S. Timilsina ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL |
| title_full | ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL |
| title_fullStr | ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL |
| title_full_unstemmed | ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL |
| title_short | ASSESSING THE IMPACTS OF CLIMATE CHANGE ON THE HYDROLOGY OF THE INDRAWATI RIVER BASIN, NEPAL |
| title_sort | assessing the impacts of climate change on the hydrology of the indrawati river basin nepal |
| url | https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/IV-5-W2/1/2019/isprs-annals-IV-5-W2-1-2019.pdf |
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