|关键词: 总磷 数值模拟 输移扩散 迎风有限元法 太湖
|Numerical study on the distribution of TP in Taihu Lake and the impact from lake current
Ma Shengwei1, Cai Qiming2
1.Yunnan Institute of Environmental Science, Kunming 650034;2.Nanjing Institute of Geography & Limnnology, Chinese Academy of Sciences, Kanjing 210008
|A new upwinding finite element numerical models which is two-dimensional and suitable for calculating concentrations of total phosphorus (TP) in shallow lakes considering major controlling factors of a dvection, dispersion, deposition and releasing from bottom, is derived. Moreover it is used in the research on the characteristics and effecting factors of TP distribution in Taihu Lake. Main results are:(1) The model presented is reasonable, valid and cost-effective; (2) Lake current produces certain impact on TP distribution in Taihu Lake. In general. the flow patterns dominated by anticlockwise circulation with a higher speed (velocity) are more beneficial to TP transportation and dispersion process; (3) rhe ability of diluting purification of the open water in Taihu Lake is much stronger than that of Meiliang Bay; (4) Major factors affecting TP concentration are different from region to region in Taihu Lake briefly, in the waterfield to the west of the line of Daojiao Hill-Dalei Hill-Xingtang. the major controlling factors are hydraulic transportation and dispersion, and to the east of the line of Marivshan Island-West Hill-Zheshan Hill it is the releasing from the bottom sediment.
|Key words: Total phosphorus numerical simulation transportation and dispersion upwinding finite element method Taihu Lake