HYDROLOGIC IMPACT OF CLIMATE CHANGE ON GURUPURA RIVER CATCHMENT, INDIA

Mudbhatkal, Amogh (2017) HYDROLOGIC IMPACT OF CLIMATE CHANGE ON GURUPURA RIVER CATCHMENT, INDIA. In: 10th International Geographical Union Conference on Urbanisation, Health & Wellbeing and SDG, 17-18 March 2017, Hyderabad, India.

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HYDROLOGIC IMPACT OF CLIMATE CHANGE ON GURUPURA RIVER CATCHMENT, INDIA
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Abstract

The present study investigates the long-term impacts of climate change on hydrology and water resources of the Western Ghats of India. The Western Ghats of India is a hotspot of biological diversity and is mainly responsible for the monsoonal rains along the west coast basins. The Gurupura River is an independent west flowing river of the Western Ghats of India in Karnataka with a catchment area of 712 sq. km and the catchmentis classified under the per-humid climate. In order to assess the changing climate, long-term trend analysis (55 years) of meteorological variables (rainfall and temperature) was carried out using the modified Mann-Kendall trend test and the magnitude of thetrend was quantified using the Sen’s slope estimator. Significant changes were observed with rainfall decreasing at the rate of 12.40 mm per year and the average temperature rising at 0.100 C per decade. The SWAT hydrological model was employed to assess the impact of rainfall and temperature pattern on the hydrology of the catchment. The calibration and validation of the model were done from 1974-1981 and 1982-1985, respectively. The performance of the model was evaluated using the Nash-Sutcliffe efficiency (NSE), Coefficient of determination (R2) and the Percentage of deviation from the observed streamflow (PBIAS). The NSE and R2 for the calibration period were 0.86 and PBIAS was 28.9 indicating good performance of the model, since the calibration was carried out on a daily time step. Interestingly, the impact of climate change on the annual stream flow yielded an interesting picture and portrayed a decreasing trend at the rate of 0.12 % per year. The results of the present study are expected to serve as a guideline to hydrologists and water resource management planners in minimizing uncertainty and in forecasting the demand and availability of water.

Keywords:Western Ghats of India, Climate change, streamflow, Soil and water assessment tool (SWAT)
Subjects:F Physical Sciences > F860 Climatology
F Physical Sciences > F852 Hydrology
Divisions:College of Science > School of Geography
ID Code:49907
Deposited On:24 Jun 2022 14:50

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