Numerical Simulation Of Typhoon And Basic Wind Speed Prediction Based On Empirical Parameter Model

Typhoon disaster is one of the major natural disasters in China and Southeast Asian countries.The occurrence frequency of typhoon is high which will threat life and cause large property loss.Therefore,the wind load is the main control load when designing the building structure in the southeastern coastal area of China.The value depends mainly on the local design wind speed,which depends on the long-term accurate typhoon observation data.Due to the low quality of the existing historical typhoon observation data,the numerical simulation method is used to simulate the typhoon path and wind field to estimate the basic design wind speed.In the wind field calculation model,which is mainly divided into dynamic model and empirical parameter model,and there are few studies on empirical parameter models in China.So this paper mainly study the specific method to determine the parameters applied in the empirical parameter wind filed model,such as roughness adjustment parameters,radial adjustment parameters,asymmetric adjustment parameters of wind field and gradient height adjustment parameters,and the calculation model of typhoon wind field is established for the southeastern coastal areas of China.Based on the wind field model,the basic design wind speed is deduced in Xiamen area.In the case of design wind speed calculation,the historical typhoon with large influence on the calculation points was selected by making the simulation circle.The optimal probability distribution model of typhoon annual incidence,typhoon center moving speed,maximum wind speed radius,typhoon moving azimuth angle and typhoon center pressure difference in typhoon key parameters were analyzed.And the Monte Carlo simulation was used to simulate the typhoon for 100 years in the simulated circle.The wind field was calculated by using the parameter wind field model and the extreme wind speed sequence of 100 years was obtained.then uses the extreme value distribution to calculate the design wind speed under different reproduction period in Xiamen.