“引江济太”工程对太湖水体交换的影响研究  

Influence study about water exchange on the Taihu Lake based on the “water diversion project from the Yangtze River to the Taihu Lake(WDYT)”

作　　者：胥瑞晨 逄勇[1,2] 胡祉冰 朱天依 XU Rui-chen;PANG Yong;HU Zhi-bing;ZHU Tian-yi(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098

出　　处：《中国环境科学》2020年第1期375-382,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(51879070);国家水体污染控制与治理科技重大专项(2018ZX07208-005);中央高校建设世界一流大学(学科)和特色发展引导专项资金资助项目

摘　　要：为了探究“引江济太”工程对太湖水体的交换范围及能力的影响,本研究耦合对流扩散及水体交换模型,依据不同流量与常规风场共设置10种工况,对太湖水体的交换区域及交换周期进行数值模拟.结果表明:(1)流量是影响水体交换率的主要因素,200m^3/s下贡湾的半交换周期与常规风场联系不大,稳定在8~9d左右;(2)常规风场对局部交换区域的空间分布有着明显影响,在北风和西北风条件下,太湖水体的交换区域主要集中在东湖区,东风和东南风条件下,太湖水体的交换区域主要集中在西北湖区;(3)为降低长江水体对太湖水质的不利风险,“引江济太”工程引水时间/方案应结合太湖区域气象预报,尽量选择在以东风或者东南风为主的条件下进行引水工作.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 200m^3/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.

关 键 词：水体交换 半交换周期 数值模拟 望虞河 

分 类 号：X143[环境科学与工程—环境科学]