| Recent years,rapid development of China's urban construction,artificial landscape lakes are emerging,and it has become an important component of urban living environment.Howeverwith the economy development and urbanization quicken, urban shallow lake has been contaminated to varying degrees resulting in the deterioration of water environment.The devopment of lake water environmental planning is a precondition for guide management of the water environment,and the numerical simulation of of the lakes water environment research is an important technical means for planning.In this paper,we make the Furong Lake of Xi'an Datang Furong Park as the study object,according to rainfall data,evaporation data,green areas and tourism of Lake neighborhood,we analyse detailedly the pollution sources of the Furong lake, including non-point pollution,rainfall pollution,tourism pollution,artificial fill water pollution and sediment pollution.For the sources of pollution,we bring forward the pollution control measures,including non-point source pollution control,rainfall pollution control,tourism pollution control,artificial fill water pollution control and sediment pollution control.In addition,we propose water quality improvement technologies,including artificial floating island or floating bed and changing the lake flow state.Response to changes the lake stream flow,this article has changed the way of water import.the existing water import of Furong Lake is with a water inlet and a water outlet in the southwest corner and the southeast corner of the lake.As a result of the larger lakes,whirlpool prone areas and stagnant water areas appear easily.the water flow rate is slow,and not easy to dilute and spread pollutants,so it easily deteriorate the water quality of lakes.To maintain the same volume of lake water,adding a water inlet in order to chang the lake flow stream.In this paper,we bring forward five kinds of project,and add a water inlet in a different location.We carry through respectively numerical simulation for the flow field of the existing methods and five project.Computational fluid dynamics(CFD for short,coming from English Computational Fluid Dynamics) computational fluid dynamics for short.It is analysis for the relevant physical system including fluid mechanics and heat transfer by means of computer numerical calculation and image display.It is the numerical simulation under the control of the flow basic equation(mass conservation equation,momentum conservation equation,energy conservation equation)for the flow.In this paper,we carry Through numerical simulation for flow in the six condition by the existing FLUENT.We choose the optimal program V by the velocity distribution,flow size,whirlpool areas and stagnant water areas,so it can enhance the mobility of the lake,increase the concentration of dissolved oxygen and improve effectively lake water quality.
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