Temporal and spatial variations in future hydrological processes under a changing climate in the humid river basins of west flowing rivers of India.
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| Title: | Temporal and spatial variations in future hydrological processes under a changing climate in the humid river basins of west flowing rivers of India. |
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| Authors: | Drissia, T K1 (AUTHOR) drissia13@gmail.com, Eldho, T I2 (AUTHOR), Sreya, P1 (AUTHOR), Dinesan, V P1 (AUTHOR) |
| Source: | Journal of Earth System Science. Sep2026, Vol. 135 Issue 3, p1-18. 18p. |
| Subject Terms: | *Streamflow, *Monsoons, *Watersheds, *Hydrology, *Hydrologic models, *Land use, *Climate change |
| Geographic Terms: | India |
| Abstract: | The present study examines and compares the spatial and temporal variations in the future streamflow across four South Indian river basins, humid river basin of Chaliyar (CHAL) and dry sub-humid river basins of Ithikkara (ITHK), Vamanapuram (VMPM), and Thamiraparni (TMPR). To simulate the future streamflow, an ensemble of five general circulation models (GCMs) was integrated into Soil Water Assessment Tool (SWAT). Simulations were conducted for three future periods: the near future (2011–2040), mid future (2041–2070), and far future (2071–2100) under two scenarios, climate change alone and climate–land use/land cover (LU/LC) change. Compared to the humid basin (CHAL), which shows an overall increase in stream flow during the southwest monsoon (up to ~25 m3/s), and a moderate rise during the northeast monsoon (up to ~10 m3/s), the dry sub-humid basins (ITHK and VMPM) exhibit a contrasting trend with a significant decline in streamflow during the southwest (up to ~30 m3/s) and northeast monsoons (up to ~46 m3/s). In between these extremes, TMPR exhibits spatially mixed trends, with some regions experiencing a significant increase and others a decline; on average stream flow rises by up to ~10 m3/s during both monsoon seasons. These insights can help in developing an effective river basin management plan and show the need for river basin-scale impact studies in a region for various scenarios. Research highlights: In humid river basin, Chaliyar, streamflow is expected to decrease in June followed by an increase in July to September, indicating a possible shift in the onset of the southwest monsoon. The dry sub-humid river basins Ithikkara and Vamanapuram river basin are anticipated a decrease in southwest and northeast monsoon. Significant changes expected in mid and far future than in near future. Non monsoon flow is expected to increase in both humid and dry sub-humid basins. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 195596265 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Temporal and spatial variations in future hydrological processes under a changing climate in the humid river basins of west flowing rivers of India. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Drissia%2C+T+K%22">Drissia, T K</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> drissia13@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Eldho%2C+T+I%22">Eldho, T I</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sreya%2C+P%22">Sreya, P</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dinesan%2C+V+P%22">Dinesan, V P</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Earth+System+Science%22">Journal of Earth System Science</searchLink>. Sep2026, Vol. 135 Issue 3, p1-18. 18p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Streamflow%22">Streamflow</searchLink><br />*<searchLink fieldCode="DE" term="%22Monsoons%22">Monsoons</searchLink><br />*<searchLink fieldCode="DE" term="%22Watersheds%22">Watersheds</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrology%22">Hydrology</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrologic+models%22">Hydrologic models</searchLink><br />*<searchLink fieldCode="DE" term="%22Land+use%22">Land use</searchLink><br />*<searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22India%22">India</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The present study examines and compares the spatial and temporal variations in the future streamflow across four South Indian river basins, humid river basin of Chaliyar (CHAL) and dry sub-humid river basins of Ithikkara (ITHK), Vamanapuram (VMPM), and Thamiraparni (TMPR). To simulate the future streamflow, an ensemble of five general circulation models (GCMs) was integrated into Soil Water Assessment Tool (SWAT). Simulations were conducted for three future periods: the near future (2011–2040), mid future (2041–2070), and far future (2071–2100) under two scenarios, climate change alone and climate–land use/land cover (LU/LC) change. Compared to the humid basin (CHAL), which shows an overall increase in stream flow during the southwest monsoon (up to ~25 m3/s), and a moderate rise during the northeast monsoon (up to ~10 m3/s), the dry sub-humid basins (ITHK and VMPM) exhibit a contrasting trend with a significant decline in streamflow during the southwest (up to ~30 m3/s) and northeast monsoons (up to ~46 m3/s). In between these extremes, TMPR exhibits spatially mixed trends, with some regions experiencing a significant increase and others a decline; on average stream flow rises by up to ~10 m3/s during both monsoon seasons. These insights can help in developing an effective river basin management plan and show the need for river basin-scale impact studies in a region for various scenarios. Research highlights: In humid river basin, Chaliyar, streamflow is expected to decrease in June followed by an increase in July to September, indicating a possible shift in the onset of the southwest monsoon. The dry sub-humid river basins Ithikkara and Vamanapuram river basin are anticipated a decrease in southwest and northeast monsoon. Significant changes expected in mid and far future than in near future. Non monsoon flow is expected to increase in both humid and dry sub-humid basins. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=195596265 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12040-026-02830-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 1 Subjects: – SubjectFull: Streamflow Type: general – SubjectFull: Monsoons Type: general – SubjectFull: Watersheds Type: general – SubjectFull: Hydrology Type: general – SubjectFull: Hydrologic models Type: general – SubjectFull: Land use Type: general – SubjectFull: Climate change Type: general – SubjectFull: India Type: general Titles: – TitleFull: Temporal and spatial variations in future hydrological processes under a changing climate in the humid river basins of west flowing rivers of India. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Drissia, T K – PersonEntity: Name: NameFull: Eldho, T I – PersonEntity: Name: NameFull: Sreya, P – PersonEntity: Name: NameFull: Dinesan, V P IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 02534126 Numbering: – Type: volume Value: 135 – Type: issue Value: 3 Titles: – TitleFull: Journal of Earth System Science Type: main |
| ResultId | 1 |
