Assessing climate change impacts on river hydrology – A case study in the Western Ghats of India

Sharannya, T M and Mudbhatkal, Amogh and Mahesha, A (2018) Assessing climate change impacts on river hydrology – A case study in the Western Ghats of India. Journal of Earth System Science, 127 (6). pp. 1-11. ISSN 0253-4126

Full content URL: http://doi.org/10.1007/s12040-018-0979-3

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Assessing climate change impacts on river hydrology – A case study in the Western Ghats of India
https://doi.org/10.1007/s12040-018-0979-
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Abstract

The objective of this study is to evaluate the hydrological impacts of climate change on rainfall,
temperature and streamflow in a west flowing river originating in the Western Ghats of India. The longterm
trend analysis for 110 yr of meteorological variables (rainfall and temperature) was carried out using
the modified Mann–Kendall trend test and the magnitude of the trend was quantified using the Sen’s slope
estimator. The Regional Climate Model (RCM), COordinated Regional climate Downscaling EXperiment
(CORDEX) simulated daily weather data of baseline (1951–2005) and future RCP 4.5 scenarios (2006–
2060) were used to run the hydrological model, Soil and Water Assessment Tool (SWAT), in order to
evaluate the effect of climate change on rainfall, temperature and streamflow. Significant changes were
observed with regard to rainfall, which have shown decreasing trend at the rate of 2.63mm per year for
the historical and 8.85mm per year for RCP 4.5 future scenarios. The average temperature was found
to be increasing at 0.10 ◦C per decade for both historical and future scenarios. The impact of climate
change on the annual streamflow yielded a decreasing trend at the rate of 1.2Mm3 per year and 2.56Mm3,
respectively for the past and future scenarios. The present work also investigates the capability of SWAT
to simulate the groundwater flow. The simulated results are compared with the recession limb of the
hydrograph and were found to be reasonably accurate.

Additional Information:Sharannya, T.M., Mudbhatkal, A. & Mahesha, A. J Earth Syst Sci (2018) 127: 78. https://doi.org/10.1007/s12040-018-0979-3
Keywords:Base flow, climate change, Gurupura catchment, Mann–Kendall, SWAT
Subjects:F Physical Sciences > F852 Hydrology
D Veterinary Sciences, Agriculture and related subjects > D443 Water Resource Management
Divisions:College of Science > School of Geography
ID Code:32846
Deposited On:01 Aug 2018 15:01

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