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Effect on Chaohu Lake Water Environment of Water Transfer from Yangtze River to Chaohu Lake

XIE Xing-yong,QIAN Xin,ZHANG Yu-chao,QIAN Yu,TIAN FengState Key Laboratory of Pollution Control and Resources Reuse,School of the Environment,Nanjing University,Nanjing 210093,China  
A one-dimensional water quality model DYRESM-CAEDYM for Chaohu Lake was established,and the parameters of the model were calibrated by monitoring data including water quality,hydrology and meteorology in 2005.Then,the parameters of a water quality model applicable to the water environment of Chaohu Lake were determined.The model was applied to simulate the influence of water transfer from the Yangtze River to Chaohu Lake on TN,TP,and chlorophyll a mass concentrations in Chaohu Lake.The simulated results show that the water transfer project could decrease the concentrations of TN and TP by 16% and 19% when the annual volume of water regulation is 9.57 billion m~3.The water transfer project could also reduce the outbreak intensity of algal blooms;the mass concentration peaks of chlorophyll a could decline from 51.42(μg/L) to 38.96(μg/L),and the number of days in which the mass concentration of chlorophyll a exceeded 30(μg/L) could be reduced from 26 d to 16 d.The effect of pollution control in the drainage area was analyzed.The results show that TN and TP could decrease by 24.9% and 33.3%; the mass concentration peaks of chlorophyll a in summer could decline from 51.42 (μg/L) to 32.72(μg/L);and the number of days in which the mass concentration of chlorophyll a exceeded 30(μg/L) could be reduced from 26 d to 7 d,as compared with the case without pollution control if the inlet pollution load of tributaries were reduced by 5% and sediment dredging was carried out.
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