CLIMATE CHANGE IMPACTS ON FLOW REGIMES OF WESTERN GHATS, INDIA

Mudbhatkal, Amogh (2017) CLIMATE CHANGE IMPACTS ON FLOW REGIMES OF WESTERN GHATS, INDIA. In: 3rd World’s Large Rivers Conference, 18-21 April 2017, New Delhi, india.

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CLIMATE CHANGE IMPACTS ON FLOW REGIMES OF WESTERN GHATS, INDIA

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Abstract

The present study is focused on the assessment of the impact of the climate change on the hydrology of the river regimes originating from the Western Ghats of India. The Western Ghats are the mountainous forest range of tropical region which plays a major role in the distribution of Indian monsoon rains. The study has three objectives which include the evaluation of the performance of bias correction methods, ascertain the trend of climatic variables and to quantify the hydrological impacts of climate change on the availability of water in the Western Ghat basins. This work compares the performance of five bias correction methods for precipitation and four approaches for temperature in modeling the hydrology of river catchments. The results indicated bias in the RCM simulation of precipitation and temperature, and subsequent biased stream flow. The performance of the delta change correction method was consistently better for precipitation and all methods performed alike for temperature. The trend analysis reveals that the effect of climate change in the catchments of Western Ghats is quite heterogeneous. The results indicate a decreasing trend for annual rainfall or no trend over the catchments. The Indian south-western monsoon rainfall showed a decreasing trend and the summer rains were found to be increasing. The post-monsoon rainfall, however, showed a significant increase in the basins. The temperature was found to be increasing with the average annual temperature rising to the extent of 0.20C to 0.80C per decade. The ArcSWAT model has been used to simulate river catchments which exhibited a Nash-Sutcliffe efficiency of > 0.70. The impacts of climate change over the Western Ghats are very evident from the variation in flow regimes and for which, the flow of each river responds differently.

Keywords:Climate change, Western Ghats of India, Soil and water assessment tool (SWAT), Trend analysis
Subjects:F Physical Sciences > F860 Climatology
F Physical Sciences > F832 Remote Sensing
G Mathematical and Computer Sciences > G150 Mathematical Modelling
F Physical Sciences > F800 Physical and Terrestrial Geographical and Environmental Sciences
F Physical Sciences > F891 Geographical Information Systems
F Physical Sciences > F852 Hydrology
Divisions:College of Science > School of Geography
ID Code:49908
Deposited On:24 Jun 2022 14:21

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