浅水湖泊平面二维水质模型研究

磷氮元素在水体中迁移对湖泊富营养化研究具有重要性。采用有限元伽辽金加权余量法建立了简单的二维水质模型,并计算了在风场作用下的苏州市澄湖丰水期和枯水期的氮磷的分布以及输移。计算中引入了可由实测资料率定的可为正负的综合衰减参数,综合考虑了氮磷元素的沉降速率和释放速率,这样减少了水质多参数难确定的困难。计算的结果表明,流态与实际情况吻合较好,氮磷元素的浓度计算值与实测值相差不大。

Two-dimensional model of water quality and its application in shallow lake

In order to predict the lake eutrophication,it is necessary to study the nutrients distribution such as phosphorus and nitrogen pollution.In this paper,the weighted residual method of finite element was used to establish the two dimensional depth-averaged water quality model.Then,the hydrodynamical movement and transport of nutrient material in Chenghu Lake were simulated with important functions.A comprehensive decay parameter of pollutant confirmed by field data was introduced in the calculation,which synthetically considered the settlement velocity and release speed of nitrogen and phosphorus at the same time.The results are in fair agreement with numerical data and observed data.