Impacts of Climate Change on Varied River-Flow Regimes of Southern India

Mudbhatkal, Amogh; Raikar, Rajkumar V.; Venkatesh, B.; Mahesha, A.

doi:10.1061/(asce)he.1943-5584.0001556

Cited by 34 publications

(14 citation statements)

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“…Similar decrease in the historic trend of rainfall and streamflow in the river Netravathi was reported by Mudbhatkal et al . (). The study further assessed the impact of climate change on the river Netravathi using the Representative Concentration Pathway 4.5 (RCP 4.5) scenario and demonstrated the long‐term persistence of streamflow in rivers.…”

Section: Resultsmentioning

confidence: 99%

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Regional climate trends and topographic influence over the Western Ghat catchments of India

Mudbhatkal

Mahesha

2017

Intl Journal of Climatology

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This study investigates the role of elevation stratification and climate change on the hydrology of Western Ghat catchments during the period from 1951 to 2013 using gridded data. The trend analysis of rainfall and temperature was conducted using the Mann–Kendall trend test, and the hydrological modelling of the rivers was conducted using the Soil and Water Assessment Tool (SWAT) model. To characterize the spatial distribution of rainfall and streamflow based on elevation stratification, contemporary rainfall zones were delineated and the response of each zone was evaluated. The results indicated that the maximum rainfall occurs at certain distance on the windward side from the crest of the Western Ghats. On the leeward side (eastern plateau), the rainfall is maximum at crest (Western Ghats) and decreases with distance. The rivers in the southern portion of the Western Ghats of India were highly vulnerable to changing climate followed by the central portion. The annual and monsoon rainfall in the southern river decreased at 0.43 and 0.30 decade−1 (1 significance level), respectively. The summer rainfall in the river of the central portion (Netravathi River) decreased at 0.44 decade−1. The annual air temperature of the southern river catchment (Vamanapuram) increased at the rate of 0.12 °C decade−1 (at 0.1 significance level), and the air temperature of the central rivers increased at the rate of 0.09, 0.08, and 0.07 °C (0.1 significance level), respectively. The streamflow response of the southern and central rivers was discernible as the monsoon flow decreased at 37 decade−1 (0.1 significance level) in the southern river and 10 decade−1 (5 significance level) in the central river. Interestingly, the pristine Aghanashini River demonstrated resilience to climate change with an increase in annual rainfall and streamflow at 115 mm decade−1 (5 significance level) and 0.71 Mm3 decade−1 (0.1 significance level), respectively

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Section: Resultsmentioning

confidence: 99%

“…The study by Mudbhatkal et al . () compared the hydrological impacts of climate change in west and east flowing rivers of the Western Ghats of India. The study revealed an increasing trend of rainfall and streamflow in an east flowing river and a decreasing trend of rainfall and streamflow in the west flowing river.…”

Section: Introductionmentioning

confidence: 99%

Regional climate trends and topographic influence over the Western Ghat catchments of India

Mudbhatkal

Mahesha

2017

Intl Journal of Climatology

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“…The RCP 4.5 scenario used in the present study describes medium stabilization after the year 2100 without overshoot pathway to 4.5 W/m 2 . Representative Concentration Pathways (RCPs) with use of CORDEX datasets can be used to demonstrate potential impacts on climate change on hydrology (Li et al 2016;Shrestha and Aung 2016;Mudbhatkal et al 2017). The climatic data from CORDEX RCM for RCP 4.5 scenario was corrected for bias using Delta Change correction method and given as an input to the SWAT model.…”

Section: Data Usedmentioning

confidence: 99%

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

2018

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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 and future RCP 4.5 scenarios 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 2.63 mm per year for the historical and 8.85 mm 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 1.2 Mm 3 per year and 2.56 Mm 3 , 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.

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“…The Soil and Water Assessment Tool (SWAT) is a physically based semi-distributed model intended to compute and route water, sediments, and contaminants from the individual drainage units (subbasins) to their outlets throughout the river basin [35]. The SWAT model is widely used for simulating biophysical processes, viz., erosion, vegetative growth, water quality, streamflow, and pollutant concentration for quite a long period [36][37][38]. It segments the river basin into several subbasins leading to Hydrological Response Units (HRUs), defined by various combinations of land use, soil characteristics, topography, and management systems.…”

Section: Hydrological Modelmentioning

confidence: 99%

Evaluation of Satellite Precipitation Products in Simulating Streamflow in a Humid Tropical Catchment of India Using a Semi-Distributed Hydrological Model

Sharannya

Al‐Ansari

Barma

et al. 2020

Water

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Precipitation obtained from rain gauges is an essential input for hydrological modelling. It is often sparse in highly topographically varying terrain, exhibiting a certain amount of uncertainty in hydrological modelling. Hence, satellite rainfall estimates have been used as an alternative or as a supplement to station observations. In this study, an attempt was made to evaluate the Tropical Rainfall Measuring Mission (TRMM) and Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS), employing a semi-distributed hydrological model, i.e., Soil and Water Assessment Tool (SWAT), for simulating streamflow and validating them against the flows generated by the India Meteorological Department (IMD) rainfall dataset in the Gurupura river catchment of India. Distinct testing scenarios for simulating streamflow were made to check the suitability of these satellite precipitation data. The TRMM was able to better estimate rainfall than CHIRPS after performing categorical and continuous statistical results with respect to IMD rainfall data. While comparing the performance of model simulations, the IMD rainfall-driven streamflow emerged as the best followed by the TRMM, CHIRPS-0.05, and CHIRPS-0.25. The coefficient of determination (R2), Nash–Sutcliffe efficiency (NSE), and percent bias (PBIAS) were in the range 0.63 to 0.86, 0.62 to 0.86, and −14.98 to 0.87, respectively. Further, an attempt was made to examine the spatial distribution of key hydrological signature, i.e., flow duration curve (FDC) in the 30–95 percentile range of non-exceedance probability. It was observed that TRMM underestimated the flow for agricultural water availability corresponding to 30 percent, even though it showed a good performance compared to the other satellite rainfall-driven model outputs.

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Impacts of Climate Change on Varied River-Flow Regimes of Southern India

Cited by 34 publications

References 50 publications

Regional climate trends and topographic influence over the Western Ghat catchments of India

Regional climate trends and topographic influence over the Western Ghat catchments of India

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

Evaluation of Satellite Precipitation Products in Simulating Streamflow in a Humid Tropical Catchment of India Using a Semi-Distributed Hydrological Model

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