| 摘要: |
| 用数值模拟的方法研究了太湖水体中TP分布特征及湖流对其影响.推导、建立了一包括平流、水平扩散、沉降和底泥释放的浅水湖泊中污染物(TP)浓度分布计算的二维迎风有限元数值模式,并在给定若干点源条件下计算各种稳态流场下太湖水体中的TP分布.初步揭示了其分布特征及影响因素,探讨了湖流对太湖水体中污染物(TP)输移扩散过程的影响 |
| 关键词: 总磷 数值模拟 输移扩散 迎风有限元法 太湖 |
| DOI：10.18307/1997.0406 |
| 分类号: |
| 基金项目:国家自然科学基金49171017 |
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| Numerical study on the distribution of TP in Taihu Lake and the impact from lake current |
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Ma Shengwei1, Cai Qiming2
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1.Yunnan Institute of Environmental Science, Kunming 650034;2.Nanjing Institute of Geography & Limnnology, Chinese Academy of Sciences, Kanjing 210008
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| Abstract: |
| 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 |
