Numerical Simulation Research On Impact Of Large-scale Wind Farms On Regional Climate

Useing the EH50M model data under the A1B scenario,this study researches the impact of large-scale wind farms, Jiuquan ten million kilowatts base in the Gansu Corridoron, on regional climate with regional climate model.The changes characteristics in boundary layer, temperature, humidity and other variables are analyzed caused by large-scale wind farm in next30years.The results show that:(1) while the large-scale wind farm set up, the atmospheric boundary layer will be more unstable, both the boundary layer height (PBLH) and the vertical wind shear will be rise;due to the mechanical turbulence caused by wind turbines, the thermal turbulence caused by local heating in afternoon will facilitate each other and become stronger, the increase of PBLH is still very large from the wind farm in the wind direction,while because of the suppression of the mechanical turbulence caused by wind turbines in stable air at night.(2) After the large-scale wind farm was settd up, temperature increased by0.3℃and humidity reduced by200mg/kg below600hPa at the wind farm, the down stream region of the wind farm, while the changes of them above600hPa are not obvious.(3)as the result of the effect of topography, topographic waves occurred,which transports the momentum from high lays and leads to increasing of wind speed at some part of Gansu Corridor.(4) There are obviously diurnal changes of PBLH, temperature, humidity, wind speed and direction. In daytime, with higher temperatures and wind speed, the unstable atmospheric stratification is more obvious than it at night.(5)Wind farms effects regional precipitation mainly through changing convective precipitation time;convective rain day increased1-1.5day/year around the wind farm, but due to the reducing of water vapor, the effect of terrain, precipitation in some areas will be reduced about2-3mm.