Abstract:
Based on the WRF (weather research and forecasting) model, a numerical simulation of a typhoon wind field near the Shenzhen meteorological observation gradient tower has been carried out for super typhoon “Mangkhut”. Field measurement data at the Shenzhen meteorological observation tower are used for verification. A moving nested mesh is employed to reproduce the evolution of typhoon “Mangkhut”, and the UCM (urban canopy model) is incorporated into the simulation to resolve the multi-scale urban wind field. The spatial distribution of the urban wind field under the influence of the typhoon has been accurately simulated with the aid of the UCM and high-resolution geographical data. The hilly terrain in the city leads to an uneven distributed wind field. The numerically obtained typhoon wind speeds at several heights at the Shenzhen meteorological observation gradient tower agree well with the observed data, indicating that the WRF simulation coupled with UCM could effectively capture the characteristics of urban wind fields when a typhoon passes through. In addition, compared with a WRF simulation without the UCM, it is demonstrated that the numerical accuracy of near-surface wind velocity can be considerably improved by the UCM.