Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño
<p>El Niño–Southern Oscillation (ENSO) is the most prominent driver of the inter-annual variability of Indian summer monsoon rainfall (ISMR). This study focuses on understanding the hydrological variations in Godavari River Basin (GRB) due to the weakening of ISMR during El Niño years (1980–20...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-04-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://piahs.copernicus.org/articles/385/203/2024/piahs-385-203-2024.pdf |
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| author | C. Thakur K. S. Kasiviswanathan C. Teutschbein B.-S. Soundharajan M. M. Diwan Mohaideen V. Budamala |
| author_facet | C. Thakur K. S. Kasiviswanathan C. Teutschbein B.-S. Soundharajan M. M. Diwan Mohaideen V. Budamala |
| author_sort | C. Thakur |
| collection | DOAJ |
| description | <p>El Niño–Southern Oscillation (ENSO) is the most prominent driver of the inter-annual variability of Indian summer monsoon rainfall (ISMR). This study focuses on understanding the hydrological variations in Godavari River Basin (GRB) due to the weakening of ISMR during El Niño years (1980–2008), using the variable infiltration capacity (VIC) model. The entire basin was discretized into 1325 uniform grids of resolution <span class="inline-formula">0.15<i>°</i>×0.15<i>°</i></span> (about 16.65 km), and hydrological parameters of the basin were analysed at each grid level for various El Niño events. Based on the Oceanic Niño Index (ONI), obtained from National Oceanic and Atmospheric Administration (NOAA), El Niño events occurred in the past were subclassified into weak (2004 and 2006), moderate (1986, 1994 and 2002), strong (1987 and 1991) and very strong (1982, 1987) events. For this study, VIC model was run for the period 1980–2008 and a composite of El Niño and normal years (1981, 1985, 1989, 1990, 1992, 1993, 1996, 2001 and 2003) was prepared to assess the impacts of El Niño events on the hydrology of GRB. Our results showed a negative correlation of precipitation, abstractions and soil moisture with the increasing magnitude of El Niño events. The quantum of precipitation was reduced during El Niño years compared to normal years, which showed the basin's exposure to more frequent droughts during El Niño events.</p> |
| first_indexed | 2024-04-24T07:52:27Z |
| format | Article |
| id | doaj.art-a81eef7eae12426f9fd027b1db667187 |
| institution | Directory Open Access Journal |
| issn | 2199-8981 2199-899X |
| language | English |
| last_indexed | 2024-04-24T07:52:27Z |
| publishDate | 2024-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Proceedings of the International Association of Hydrological Sciences |
| spelling | doaj.art-a81eef7eae12426f9fd027b1db6671872024-04-18T10:26:14ZengCopernicus PublicationsProceedings of the International Association of Hydrological Sciences2199-89812199-899X2024-04-0138520320910.5194/piahs-385-203-2024Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-NiñoC. Thakur0K. S. Kasiviswanathan1C. Teutschbein2B.-S. Soundharajan3M. M. Diwan Mohaideen4V. Budamala5Department of WRD&M, Indian Institute of Technology Roorkee, Roorkee, 247667, IndiaDepartment of WRD&M, Indian Institute of Technology Roorkee, Roorkee, 247667, IndiaDepartment of Earth Sciences, Uppsala University, Uppsala, 75236, SwedenDepartment of Civil Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, 641112, IndiaDepartment of WRD&M, Indian Institute of Technology Roorkee, Roorkee, 247667, IndiaDepartment of WRD&M, Indian Institute of Technology Roorkee, Roorkee, 247667, India<p>El Niño–Southern Oscillation (ENSO) is the most prominent driver of the inter-annual variability of Indian summer monsoon rainfall (ISMR). This study focuses on understanding the hydrological variations in Godavari River Basin (GRB) due to the weakening of ISMR during El Niño years (1980–2008), using the variable infiltration capacity (VIC) model. The entire basin was discretized into 1325 uniform grids of resolution <span class="inline-formula">0.15<i>°</i>×0.15<i>°</i></span> (about 16.65 km), and hydrological parameters of the basin were analysed at each grid level for various El Niño events. Based on the Oceanic Niño Index (ONI), obtained from National Oceanic and Atmospheric Administration (NOAA), El Niño events occurred in the past were subclassified into weak (2004 and 2006), moderate (1986, 1994 and 2002), strong (1987 and 1991) and very strong (1982, 1987) events. For this study, VIC model was run for the period 1980–2008 and a composite of El Niño and normal years (1981, 1985, 1989, 1990, 1992, 1993, 1996, 2001 and 2003) was prepared to assess the impacts of El Niño events on the hydrology of GRB. Our results showed a negative correlation of precipitation, abstractions and soil moisture with the increasing magnitude of El Niño events. The quantum of precipitation was reduced during El Niño years compared to normal years, which showed the basin's exposure to more frequent droughts during El Niño events.</p>https://piahs.copernicus.org/articles/385/203/2024/piahs-385-203-2024.pdf |
| spellingShingle | C. Thakur K. S. Kasiviswanathan C. Teutschbein B.-S. Soundharajan M. M. Diwan Mohaideen V. Budamala Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño Proceedings of the International Association of Hydrological Sciences |
| title | Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño |
| title_full | Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño |
| title_fullStr | Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño |
| title_full_unstemmed | Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño |
| title_short | Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño |
| title_sort | assessment of hydrological changes in godavari river basin under the impacts of el nino |
| url | https://piahs.copernicus.org/articles/385/203/2024/piahs-385-203-2024.pdf |
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