太湖水龄分布特征及“引江济太”工程对其的影响

发布时间：2018-12-07 13:15

【摘要】：太湖作为典型的风生流湖泊,风场对水体运输和交换的过程起着重要的作用.基于环境水动力学模型EFDC源程序建立了染色剂模型以及水龄模型,借助水龄研究太湖水体的长期输运过程和更新速率特征,从而为太湖的调水工程管理提供科学依据.本文在研究春、夏、秋、冬季不同风场作用下太湖的水龄季节性分布特征的基础上,结合太湖实测风速、流量数据及"引江济太"工程调水运行的现状,着重分析了望虞河枢纽调水运行以及新沟河工程对太湖水龄分布的影响.数值试验的模拟结果表明:太湖水体交换受季风影响明显,春、夏季的水龄相对较大、水体交换较差;靠近湖流入口处的地方水龄较小,远离入口的地方水龄较大;水流流向与风向一致时水龄减小,水循环加快,反之则减慢.望虞河引水引工程能够减小贡湖及湖心区的水龄,加快贡湖湖区及湖心区的水循环;新沟河工程引水能够减小梅梁湖区的水龄,改善该湖区的水质.引水工程的实施对加快整个太湖的水循环做出重要贡献.
[Abstract]:Taihu Lake is a typical wind-induced current lake. Wind field plays an important role in the process of water transportation and exchange. Based on the environmental hydrodynamic model (EFDC), the chromatin model and water age model were established. The long-term transport process and regeneration rate characteristics of Taihu Lake were studied with the aid of water age, thus providing a scientific basis for the water transfer project management of Taihu Lake. On the basis of studying the seasonal distribution characteristics of water age in Taihu Lake under the action of different wind fields in spring, summer, autumn and winter, combined with the measured wind speed and discharge data of Taihu Lake and the current situation of water diversion operation of "diversion from Yangtze River to Taitai" project, this paper studies the characteristics of seasonal distribution of water age in Taihu Lake. The influence of water transfer operation and Xingou River project on the water age distribution of Taihu Lake is analyzed. The results of numerical experiments show that the water exchange in Taihu Lake is obviously influenced by the monsoon, the water age is relatively large in spring and summer, the water exchange is poor, the water age near the entrance of the lake current is smaller, and the water age is longer in the place far from the entrance. When the flow direction is consistent with the wind direction, the water age decreases and the water cycle accelerates, otherwise, the water cycle slows down. The water diversion project of Wangyu River can reduce the water age of Gonghu Lake and its central area, and speed up the water cycle in the Lake area and its core area, while the diversion project of Xingou River Project can reduce the water age of Meiliang Lake area and improve the water quality of the lake area. The implementation of water diversion project has made an important contribution to speeding up the water cycle of Taihu Lake.
【作者单位】：河海大学海岸灾害及防护教育部重点实验室;江苏省水文水资源勘测局;
【基金】：江苏省水利科技项目(2015054) 江西省水利科技项目(KT201405)联合资助
【分类号】：TV67

【相似文献】