Characteristics of water pollution in typical reservoirs

Since the 1950s, the pollution of reservoirs has become serious. The water quality in reservoirs is deteriorating due to population growth, industrialization, and urbanization. In order to clarify the characteristics of water quality change in reservoirs, in-situ monitoring of water quality and phytoplankton were conducted in Jinpen Reservoir, Shibianyu Reservoir, Zhoucun Reservoir, and Zhelin Reservoir. This chapter discusses the change of water quality in reservoirs in terms of eutrophication, algae pollution, and endogenous pollution. The results indicate that Zhelin Reservoir, Jinpen Reservoir, and Shibianyu Reservoir are in the middle eutrophic state, while Zhoucun Reservoir is in the eutrophic state. All the reservoirs suffer from algal blooms in July and August, with cyanobacteria dominating. Stratification, a very common phenomenon, occurs in the reservoirs mentioned above, can cause the decline of bottom dissolved oxygen, aquatic ecological environment deterioration, and the release of pollutants from sediment.