Monitoring on water resource and ecological environment in Shiyanghe River basin through remote sensing in 10 years

Under the background of the climate warming, the ecological environment in the Shiyang River basin has been greatly changed. Based on the quantitative monitoring strategy and key technologies, the factors including vegetation cover, reservoir area and snow cover area were used as the indicators to monitor the ecological environment. The remote sensing imagines were used to calculate the snow coverage, vegetation cover and water resource. The result indicated that the entire area of the glacier snow fluctuated in the Qilian Mountains region with linear increasing trend from 1997 to 2006. In the eastern and middle of Qilian Mountains, the snow coverage showed a decreasing trend, but in the western, its trend was increasing. In general, the vegetation coverage was decreasing in Shiyang River basin. The degradation degrees of the sparse vegetation and density vegetation were the highest. Water resource in the downriver of Shiyang River (Hongyashan Reservoir) decreased, and the maximum reservoir area value was 19.35 km2 in 2005, the minimum value was 7.4 km2 in 2001.