Performance of the Wind Farm Parameterization Scheme Coupled with the Weather Research and Forecasting Model under Multiple Resolution Regimes for Simulating an Onshore Wind Farm

摘要

We use the Wind Farm Parameterization (WFP) scheme coupled with the Weather Research and Forecastingmodel under multiple resolution regimes to simulate turbulent wake dynamics generated by a real onshore wind farm and their influence at the local meteorological scale.The model outputs are compared with earlier modeling and observation studies.It is found that higher vertical and horizontal resolutions have great impacts on the simulated wake flow dynamics.The corresponding wind speed deficit and turbulent kinetic energy results match well with previous studies.In addition,the effect of horizontal resolution on near-surface meteorology is significantly higher than that of vertical resolution.The wake flow field extends from the start of the wind farm to downstream within 10 km,where the wind speed deficit may exceed 4％.For a height of 150 m or at a distance of about 25 km downstream,the wind speed deficit is around 2％.This indicates that,at a distance of more than 25 km downstream,the impact of the wind turbines can be ignored.Analysis of near-surface meteorology indicates a night and early morning warming near the surface,and increase in near-surface water vapor mixing ratio with decreasing surface sensible and latent heat fluxes.During daytime,a slight cooling near the surface and decrease in the near-surface water vapor mixing ratio with increasing surface sensible and latent heat fluxes is noticed over the wind farm area.