Assessment of hydrologic impacts of climate change in Tunga–Bhadra river basin, India with HEC-HMS and SDSM
Article first published online: 11 MAY 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Volume 27, Issue 11, pages 1572–1589, 30 May 2013
How to Cite
Meenu, R., Rehana, S. and Mujumdar, P. P. (2013), Assessment of hydrologic impacts of climate change in Tunga–Bhadra river basin, India with HEC-HMS and SDSM. Hydrol. Process., 27: 1572–1589. doi: 10.1002/hyp.9220
- Issue published online: 9 MAY 2013
- Article first published online: 11 MAY 2012
- Accepted manuscript online: 27 JAN 2012 01:31PM EST
- Manuscript Accepted: 15 DEC 2011
- Manuscript Revised: 4 DEC 2011
- climate change impacts;
- hydrologic model;
- statistical downscaling;
Climate change would significantly affect many hydrologic systems, which in turn would affect the water availability, runoff, and the flow in rivers. This study evaluates the impacts of possible future climate change scenarios on the hydrology of the catchment area of the Tunga–Bhadra River, upstream of the Tungabhadra dam. The Hydrologic Engineering Center's Hydrologic Modeling System version 3.4 (HEC-HMS 3.4) is used for the hydrological modelling of the study area. Linear-regression-based Statistical DownScaling Model version 4.2 (SDSM 4.2) is used to downscale the daily maximum and minimum temperature, and daily precipitation in the four sub-basins of the study area. The large-scale climate variables for the A2 and B2 scenarios obtained from the Hadley Centre Coupled Model version 3 are used. After model calibration and testing of the downscaling procedure, the hydrological model is run for the three future periods: 2011–2040, 2041–2070, and 2071–2099. The impacts of climate change on the basin hydrology are assessed by comparing the present and future streamflow and the evapotranspiration estimates. Results of the water balance study suggest increasing precipitation and runoff and decreasing actual evapotranspiration losses over the sub-basins in the study area. Copyright © 2012 John Wiley & Sons, Ltd.