Analysis of Streamflow Changes under Climate Change Using Rainfall-Runoff Model in the Kor River Basin

In this study, the predicted monthly temperature and rainfall data from HadCM3 model (base period, 1972-2001) and next period (2011-2040) under A2emission scenario were used to investigate the impacts of climate change on runoff variations in the Kor river basin. HadCM3 model output was downscaled based on a temporal downscaling approach (Change Factor) and spatial downscaling approach (Proportional) for the basin. The time series of monthly temperature and precipitation were produced in future period. The results showed that temperature and rainfall will increase and decrease in the future period relative to the base period, respectively. Then, the calibrated IHACRES model was used to model rainfall-runoff relationships in the Kor river basin. Then, the downscaled monthly temperature and rainfall time series in next period were employed to rainfall-runoff model and the monthly runoff time series were simulated for period 2011- 2040. The comparison of future period runoff relative to observed period showed that the annual runoff in the basin for period 2011-2040 will decrease about 9٫43% with respect to base period.