太湖水体的总磷分布及湖流对其影响的数值研究  

NUMERICAL STUDY ON THE DISTRIBUTION OF TP IN TAIHU LAKE AND THE IMPACT FROM LAKE CURRENT

作　　者：马生伟[1] 蔡启铭[2] 

机构地区：[1]云南省环境科学研究所,昆明650034 [2]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《湖泊科学》1997年第4期325-330,共6页Journal of Lake Sciences

基　　金：国家自然科学基金!49171017

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。A new upwinding finite element numerical model, 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) The ability of diluting purification of the open water in Taihu Lake is much stronger than that of Melliang 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 Manshan Island-West Hill-Zheshan Hill it is the releasing from the bottom sediment.

关 键 词：太湖 水体 磷酸盐 总磷分布 湖流 数值模拟 

分 类 号：P343.3[天文地球—水文科学]