Remote Sensing Monitoring on Chlorophyll-a in Danjiangkou Reservoir Based on the HJ-1 Satellite Image Data

The South-to-North Water Transfer Project is an optimal allocation and scheduling of water resources major project, the Danjiangkou reservoir as the important water source, the protection of water and water quality security is critical, determines the success of diversion project. Based Chlorophyll-a concentration quantitative inversion discriminated functions was established based on the wavelength character of chlorophyll-a reflection peak and absorbing peak in 450 nm and 570 nm by HJ-1 satellite multi-spectral image in spring, summer and autumn of 2010 and 2011.The result indicated that HJ-1A/B image data can be applied to the study of chlorophyll-a monitoring, can meet the needs of remote monitoring of water quality. Chlorophyll-a concentration quantitative inversion results showed that chlorophyll-a concentration was low in spring, and the highest period is summer, water environment condition overall was fine. The annual water environment change trend is better, chlorophyll-a concentration in 2011 was lower than that of 2010 in the same season.