Influence Of Wind Speed On Water Surface Evaporation And Control Measures

Evaporation loss is one of the main factors to reducing the water resources in artificial lakes,therefore,when planning and designing artificial lakes,it is necessary to consider the evaporation loss of water resources and take corresponding measures to control it.Evaporation research can provide scientific basis for artificial lake planning,hydrology and water resources analysis and calculation,and can also provide reference for the later construction of artificial lakes to control water surface evaporation measures.Based on this article,this paper first analyze the factors that affect the water surface evaporation loss;secondly,explore the impact of different forest belts and mountain structures on the lake surface wind speed from the perspective of wind speed;finally,based on the above research results and combined with engineering examples,it puts forward some relevant wind resistance optimization measures,and the main research work and results are as follows:(1)Analysis of factors affecting water surface evaporation.This paper analyzes the advantages and disadvantages of the research methods for the influencing factors of water surface evaporation loss at home and abroad.In view of the insufficient consideration of the existing methods in solving the correlation between events at all levels,Bayesian theory is introduced to build the water surface evaporation evaluation model,which is applied to the engineering example of Baima Lake.The results show that wind speed and solar radiation are the main factors affecting the water surface evaporation loss.(2)Research on the influence of forest belts on the wind speed of lake.Based on the above analysis results,the time average governing equation of turbulent motion of forest belt is described in detail;the relationship between forest belt coefficient and relevant physical quantities is discussed,including the relationship among forest belt ventilation coefficient,turbulence degree,permeability coefficient and so on.Based on the finite element software FLUENT and an example,the influence of forest belt structure on the lake surface wind speed is analyzed.The results show that different forest belt structures have different effects on lake surface wind speed,but the effect of reducing the lake surface wind speed is obvious compared with the absence of forest belts.(3)Research on the influence of mountains on the the wind speed of lake.Based on the turbulence theory,taking two-dimensional typical mountains as the research object,t the finite element software Fluent is used to analyze the influence of different single mountain structure on the lake surface wind speed;on this basis,the influence of the arrangement of the linked mountains on the lake surface wind speed is studied,and the numerical simulation results are compared to analyze the wind speed change of the lake.The results show that the wind speed around the lake can be effectively reduced by arranging mountains.(4)The optimal design of wind blocking scheme.Based on the research results of the influence of forest belts and mountains on the lake surface wind speed,the wind blocking scheme of Baima Lake is optimized according to the engineering example,and the corresponding optimization scheme is obtained from the two aspects of forest belt and mountain.The results show that the effect of reducing the lake surface wind speed is significant after optimization,so as to reducing water evaporation and saving water resources.