THE WIND-DRIVEN WATER CIRCULATION IN BAIYANG LAKE,CHINA AND THE IMPLICATION TO ENVIRONMENTAL REMEDIATION

The distribution and influence of wind stress on the water circulation in Baiyang Lake was simu-lated with MITgcm model. The results show that wind stress was the main driving force on the water circulation,as the water of surface layer moved in wind direction,while in underneath deeper layers,it was reversal or nearly reversal to the upper one's in more complex circulation pattern. Double eddies were clearly shown in the second horizontal layer. The topography of lake bottom complicated further the patterns of vertical flow with double ed-dies. In overall,the lake water circulation was in two directions,horizontal and vertical,regardless of seasonal change. In specific,Area I was an isolated area with stagnant water,while open Areas A,B,C,and D should be treated as a whole in terms of water exchange when pollution is studied. In Area E and F,water circulation was affected by the double-eddy in above-mentioned four areas,and by additional upward and downward flows near lake bank,which made the pollutant distribution more complicated. In shallow Areas G and H,slow-moving water would hold contaminant from dilution. Understanding in detail the circulation in the lake will help protect local environment and ecosystem from pollution and deploy remediation implementation.