滴水湖夏季环流的三维数值模拟  

Three Dimensional Numerical Simulation of Circulation in Dishui Lake in Summer

作　　者：曹慧江[1] 杨芸 朱建荣[1] 

机构地区：[1]华东师范大学河口海岸国家重点实验室,上海200062 [2]上海海港新城污水综合整治有限公司,上海200002

出　　处：《华东师范大学学报（自然科学版）》2006年第4期78-83,90,共7页Journal of East China Normal University(Natural Science)

基　　金：上海港城开发(集团)有限公司建设项目

摘　　要：利用改进的ECOM三维数值模式,计算夏季滴水湖由河流驱动的吞吐流、海表面加热产生的密度环流和风生环流,以及三者综合作用下的总环流．由河流驱动的吞吐流主要出现在河流进水和出水的连线上,并在湖中出现涡流．由湖表面加热产生的表层密度环流在两深潭处出现气旋式的环流,东侧的范围比西侧的大,中层和底层的流速减小．表层风生流在湖的中央为大致流向西北的弯曲流动,在大弯曲的地方一侧出现涡流．为满足质量守恒,底层出现与表层流向相反的补偿流．总环流在表层基本上为朝西北的流动,在底层同样出现向东南的回流,主要是由风应力驱动的．在总环流中河流驱动的吞吐流受逆风的作用,出现在中下层．Dishui Lake is a large man-made freshwater lake at Nanhui Beach in the Changjiang Estuary. The inflows/outflows driven by rivers, the thermohaline circulation, the wind-driven circulation, and the combined circulation in the Dishui Lake in summer driven by the above three dynamic factors were simulated by using improved ECOM model. The inflows/outflows driven by river appear mostly on the line between the inlet and outlet of rivers, generating eddy in the lake. Two cyclonic eddies appear in the thermohaline circulation induced by the heating of surface water in the lake. The east one of the two cyclonic eddies has wider area than the west one, and the speed at the middle and bottom layers is smaller. The surface wind-driven currents at the center of the lake mostly meander and northwestward flow. There exist eddies at a side of the strong meander. Due to the mass conservation, the reversed compensation currents appear at the bottom layer. The combined surface currents flow northwestward flow, while the bottom compensation currents flow southeastward. The combined circulation is mainly driven by the wind. The inflows/outflows in the combined circulation appear at the middle and bottom layer due to the against wind.

关 键 词：滴水湖 环流 数值模拟 

分 类 号：P334.6[天文地球—水文科学]