1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, P.R. China
2. Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, P.R. China
3. Hydrology Bureau of Changjiang Water Resources Commission, Wuhan 430010, P.R. China