摘要
本文应用FVCOM(Finite Volume Coastal Ocean Model)模型,采用示踪剂方法,对不同风力条件下巢湖污染物输运过程进行数值模拟,采用从西湖区进入东湖区的水量和10%浓度线以上湖区面积占总水面积的百分比等作为指示因素,分析了巢湖污染物分布和输运扩散的基本特征,揭示了太湖污染物不均匀分布的动力学机制.在此基础上,进一步分析了风力作用对污染物输运和东、西湖水量交换的影响规律,揭示了风速与持续时间对物质输运过程的重要作用.通过数值拟合,给出了风力特征值及其表达式,得到了风向、风速与东、西半湖水量交换之间的定量关系,发展了一种基于风速特征值对巢湖污染物输运状况进行快速评估的近似方法.结果显示,提取的月风速特征值与该月的水量交换和污染物输运扩散变化趋势基本一致.
Transport process of Chaohu Lake is investigated numerically using FVCOM（Finite Volume Coastal Ocean Model） model and tracer tracking method. Simulations are done under different wind directions, and indicators as water exchange from western lake to eastern lake and the percentage of area with over 10% tracer concentration are used to express and analyze the basic characters of transport process, which reveal the dynamic mechanism of heterogeneity in the distribution of pollutant in the lake. Moreover, the role of wind in the process is further analyzed. The simulation results reveal that the transport process is determined by wind speed and its lasting time. The quantitatively relationships of wind direction, wind speed and water exchange volume of half lakes are also discussed, and the characteristic wind variable is put forward to express the relation. Based on the above analysis, a rapid evaluation method is used to indicate the pollutant distribution in the lake. Results show that the monthly characteristic wind value coordinate well with the monthly water exchange volume between half lakes and the lake area with higher pollutant concentration due to transport process.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2015年第10期29-38,共10页
Scientia Sinica Physica,Mechanica & Astronomica
基金
中国科学院“百人计划”D类资助项目
关键词
巢湖
污染物输运
风
风生流
FVCOM模型
Chaohu Lake
pollutant transport
wind
wind-driven current
FVCOM model
