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Assessing the Vulnerability of Water Balance to Climate Change at River Basin Scale in Humid Tropics: Implications for a Sustainable Water Future

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  • Kashish Sadhwani

    (Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India)

  • T. I. Eldho

    (Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India
    Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai 400076, India)

Abstract

Sustainability in hydrology aims at maintaining a high likelihood of meeting future water demands without compromising hydrologic, environmental, or physical integrity. Therefore, understanding the local-scale impact of global climate change on hydrology and water balance is crucial. This study focuses on assessing the impact of climate change on water balance components (precipitation, surface runoff, groundwater flow, percolation, etc.) at the river basin scale in a humid tropical region. The Periyar river basin (PRB) in Kerala in India is considered as a case study and the SWAT hydrological model is adopted to obtain the water balance components. Three general circulation models are considered under two shared socioeconomic pathways (SSP 245 and SSP 585) emission scenarios assess the impact of climate change until 2100. For the PRB, the results demonstrate a significant increase in streamflow (>65%) and runoff (>40%) in the mid (2041–2070) and far (2071–2100) future under both the SSP scenarios, indicating a potential vulnerability to future floods. Conversely, in the near future under SSP 585, a decrease in runoff (−15%) and nominal changes in streamflow (−5%) are observed. Spatially, the eastern sub-basins and the west coast of the Periyar river basin are projected to experience higher precipitation events, while the central region faces reduced precipitation and low flow rates. The findings emphasize the need for proactive and sustainable management of water resources, considering irrigation requirements, groundwater discharge, and flood control measures, to mitigate the negative effects of climate change and prevent water stress/surplus situations in specific sub-basins. This study enhances our understanding of climate change impacts on water balance and emphasizes the significance of sustainable water resource management for an effective response. By integrating scientific knowledge into policy and management decisions, we can strive towards a resilient water future within a changing climate.

Suggested Citation

  • Kashish Sadhwani & T. I. Eldho, 2023. "Assessing the Vulnerability of Water Balance to Climate Change at River Basin Scale in Humid Tropics: Implications for a Sustainable Water Future," Sustainability, MDPI, vol. 15(11), pages 1-19, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:11:p:9135-:d:1164467
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    1. Ellen Wohl & Ana Barros & Nathaniel Brunsell & Nick A. Chappell & Michael Coe & Thomas Giambelluca & Steven Goldsmith & Russell Harmon & Jan M. H. Hendrickx & James Juvik & Jeffrey McDonnell & Fred Og, 2012. "The hydrology of the humid tropics," Nature Climate Change, Nature, vol. 2(9), pages 655-662, September.
    2. Chong-yu Xu, 1999. "Climate Change and Hydrologic Models: A Review of Existing Gaps and Recent Research Developments," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 13(5), pages 369-382, October.
    3. Bhumika Uniyal & Madan Jha & Arbind Verma, 2015. "Assessing Climate Change Impact on Water Balance Components of a River Basin Using SWAT Model," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(13), pages 4767-4785, October.
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    1. T. I. Eldho & Navya Chandu & Kashish Sadhwani, 2023. "A Comprehensive Study of Assessing Sustainable Agricultural Water Management under Changing Climate Scenarios—A Regional Basis Study in the Western Ghats, India," Sustainability, MDPI, vol. 15(18), pages 1-18, September.

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