Abstract
The purpose of this study was to investigate the effect of climate change on the water quality in the Song Khram river basin, Thailand. The study used the SWAT model for simulation of the hydrological aspects and the PRECIS model generated the future climate projections from the A2 and B2 scenarios of the IPCC. Coefficient of determination (r2) and Nash-Sutcliffe efficiency (NSE) were used for calibration and validation. The years 2006-2009 were calibrated and 2010-2013 were validated. The results showed that the simulated data and the observed data for the calibration and validation gave a reasonable value. This study found that during the years 2011 to 2050, the simulation showed an increase in streamflow using A2 and a decrease using B2. Uncertainty in A2 showed long low flows and flash flooding. However, B2 showed a long low flow. Both of these tests showed the same water quality with both scenarios except CBOD. Based on the climate change interactions, streamflow and water quality need to have strict guidelines for water management.
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