Characteristics of Snow Cover and Impact on Streamflow in the Dadu River Basin

By using the snow cover data in the Dadu River Basin during 2010 ~ 2014 extracted by MOD10A2, and hydrographic weather station data, the temporal and spatial distribution characteristics of snow cover in the Dadu River Basin as well as relationships among meteorological factors, snow cover, and streamflow were analyzed. The results showed that the largest annual average snow cover was Kangding, the smallest was Luding. The largest snow cover was in winter, and smallest in summer. Snow cover changed obviously with the ups and downs of the month. The snow cover was concentrated from October to next April. Precipitation changed coincident with temperature, and the peak value lagged behind the peak of snow cover. The correlation between snow cover, temperature and precipitation indicated that the negative correlation with temperature and precipitation. And the correlation between temperature and snow cover was larger. The streamflow changes were cyclical, increased rapidly in May and reached maximum in July. The correlation between streamflow, snow cover and meteorological factors indicated that the negative correlation with snow cover, and the positive correlation with temperature and precipitation. And the streamflow was more sensitive to precipitation.