IMPACT OF CLIMATE CHANGE ON HYDROLOGY OF WEST FLOWING RIVER OF WESTERN GHATS, INDIA

Mudbhatkal, Amogh (2017) IMPACT OF CLIMATE CHANGE ON HYDROLOGY OF WEST FLOWING RIVER OF WESTERN GHATS, INDIA. In: International Conference on Hydraulic and Environmental Systems (ICHES-2017), 23-25 March 2017, Belagavi, India.

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IMPACT OF CLIMATE CHANGE ON HYDROLOGY OF WEST FLOWING RIVER OF WESTERN GHATS, INDIA
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Abstract

The Western Ghats of India is a global hotspot of diversity and origin for many major rivers of peninsular India. The present investigation focusses on the impact of climate change on hydrology of the west flowing Netravathi River. The Netravathi river catchment of Karnataka has per-humid type of climate with an area of 3351 sq. km. In the study, the forecasted meteorological parameters obtained through a Regional Climate Model have been used in conjunction with conceptual ARNO rainfall-runoff model. This model incorporates soil moisture feedback into hydrological response. The rainfall, temperature and the evapotranspiration are the intrinsic parameters of the hydrologic cycle. Consequently, these are also the major driving factors of change in hydrological response due to climate change. The model is calibrated using the observed data from 1975 to 1999 and has been validated for the period 2000 to 2004. The simulation of the hydrological response of the basin has been carried out for the period 2011 to 2070. The results indicate changing trends in precipitation and inter-annual variability of hydrological variables. The temperature is clearly increasing at 0.10 C per decade (5% significance level). The discharge decreased at the rate of 406 m3/decade. Interestingly, shifting of monsoon to an earlier date with reduced peak flow of about 500 cumecs as compared to 1200 cumecs is also observed.

Keywords:ARNO Model, Western Ghats of India, Netravathi River, Rainfall-runoff
Subjects:F Physical Sciences > F860 Climatology
G Mathematical and Computer Sciences > G150 Mathematical Modelling
F Physical Sciences > F852 Hydrology
Divisions:College of Science > School of Geography
ID Code:49906
Deposited On:24 Jun 2022 15:20

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