Characteristics of water level and effects on water environmental factors in Hukou area of Poyang Lake
鄱阳湖湖口的水位特性及其对水环境的影响

Water level, an important hydrological factor in shallow lake, has great influence on hydrodynamics, ecological and chemical processes. Based on the field observations from 2007 to 2008, the seasonal change of water level and water environmental factors in Hukou area of Poyang Lake were analyzed. Meanwhile, the relation regression equations between water level and water environmental factors were established. The analysis demonstrated that all the parameters showed an obvious seasonal change. The relationship between water of Poyang Lake (Hukou Station) and that of Yangtze River (Jiujiang Station) was positive and linear. The changes in water level were found to have a significant influence on the water environmental factors in Hukou area of Poyang Lake. With increases of water level, the transparency increased accordingly, but the permanganate index and the concentrations of suspended matter, dissolved oxygen, nitride and phosphide declined accordingly.