【摘要】 针对大型浅水湖泊受风场影响显著的特点,提出考虑风向风速联合频率订正及污染带控制的水环境容量计算方法;以太湖为例,建立了二维非稳态水量水质数学模型。结合该区域的水文特征和实测的数据,对流场和浓度场进行了模拟和对比,并计算了太湖的水环境容量。结果表明:采用二维非稳态水量水质数学模型得到的太湖流场、浓度场计算值与实测值均相差不大,太湖水环境容量COD为132727 t.a-1,总磷为545t.a-1,总氮为7700t.a-1。该方法运用风向风速联合频率综合体现了风场对太湖湖流的形成及流态的作用以及对水环境容量的影响。更多还原

【Abstract】 Aiming at the significant effect of wind field in a large shallow lake,a calculation method of combining joint frequency with wind directions,wind speeds and pollution zone control was used to calculate the capacity of water environment for this lake.A 2-D unsteady state model of water quantity and quality equations was developed in a case study of Tai Lake,numerical simulations using the measured hydrological data were conducted.The results indicated that the lake’s flow and concentration fields predicted by the 2-D model are nearly the same as the measurements,both showing the water environmental capacity of COD 132727 t·a-1,TP 545t·a-1 and TN7700t·a-1.The presented method is effective in modeling the effects of wind-driven current on flow pattern and water environmental capacity,and thus it would be a useful tool for practical application.更多还原