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| Influence study about water exchange on the Taihu Lake based on the “water diversion project from the Yangtze River to the Taihu Lake (WDYT)” |
| XU Rui-chen1,2, PANG Yong1,2, HU Zhi-bing1,2, ZHU Tian-yi1,2 |
1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;
2. College of Environment, Hohai University, Nanjing 210098, China |
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Abstract In order to explore the exchange range and capacity of the "WDYT" project on the Taihu Lake water body, this study coupled the convection diffusion and water body exchange model, and conducted numerical simulation studies under 10 different working conditions according to different flow rates and conventional wind fields. The results showed that:(1) Flow rate was the main factor affecting the exchange rate of water body. The semi-exchange period of Gongwan Bay with 200m3/s flow rate was steady at about 8~9 days, which was not strongly related to the conventional wind field. (2) Conventional wind field had significant impacts on the spatial distribution of the local exchange area. Under the conditions of north wind and northwest wind, the exchange area of ??the Taihu Lake was mainly occurred in the Donghu area. Under the conditions of the east wind and southeast wind, the exchange area was mainly occurred in the Northwest area. (3) In order to mitigate the unfavorable impacts of the Yangtze River water on the lake water quality, the water diversion time/plan of the "WDYT" project should consider the Taihu Lake area weather forecast, and it was better to conduct the water diversion work under the conditions of the East or Southeast wind.
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Received: 03 June 2019
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