Assessment of the Water Quality near the Dam Area of Three Gorges Reservoir Based on Bayes

Water quality stochastic assessment based on Bayes is proposed in this paper. It is applied to assess monthly water-quality monitoring data at the typical sections in Three Gorges Reservoir from the year 2004 to 2006. The typical sections locate at Huanglingmiao, Badong, Guandukou, Xiangxi and so on. The conclusions obtained are listed as follows: (1) Water quality in the reservoir is favorable, and is between Class I and II of Environmental Quality Standard for Water Quality(GB3838-2002). (2)Water quality at any monitoring section has seasonal changes in one year but annual variation. In general, water quality in rainfall year is worse than that in dry year. (3) Nutrients are the key factor that affects the water quality, which will potentially bring on water pollution near the dam of the reservoir. So, it is important to pay more attention to take effective measures for pollution control.