Climate Change and Its Effects on Runoff at the Headwater of Kaidu River

Based on the data observed of Bayanbulak Hydrological Station and Bayanbulak Meteorological Station from 1960 to 2005,the characteristics of climate change and the response of runoff to climate change at headwater of Kaidu River have been analyzed.It is found that the mean annual temperature is rising,and annual precipitation has different obvious difference.The observed records at Bayanbulak Meteorological Station indicate that precipitation have been increasing obviously since 1989.Precipitation and temperature are the main factors which resulted in runoff changing.The correlation coefficient of annual precipitation and runoff is the largest,is 0.73.The correlation coefficient between the mean annual temperature and runoff is 0.36.When precipitation is in the same circumstances,the runoff is decreasing with temperature rising;when temperature is in the same circumstances,the runoff is increasing with precipitation increasing;but the runoff will be increased when both precipitation and temperature are increasing.