EFFECTS OF THE PARAMETERIZATION SCHEME OF DRAG COEFFICIENT ON THE SIMULATION OF TYPHOON WIND FIELD IN ENGINEERING APPLICATIONA
YE Geng-jiao
YU Hui
FANG Ping-zhi
LU Xiao-qin
CHENG Hai-feng
Abstract：Based on the vertically average equation of motion in the boundary layer,a typhoon wind field model is established for engineering application.A four-level nest grid system is used with the highest resolution being 2 kmn.The expressions of the radius of maximum wind speed,the wind speed ratio and the surface drag coefficient (Co) are specified based on the observation and research findings of the typhoon boundary layer over the past decade.An idealized experiment is performed to verify the rationality of the model,and special attention is paid to the sensitivity of the wind field to the parameterization schemes of Ca Results show that the change in Co mainly affects the wind field in the inner core region of strong typhoons.but has no significant impact on the maximum wind speeds.Typhoon Haikui (No.1211) is then simulated in order to verify the applicability of the model to the typhoon in the western North Pacific region.The mean error of the maximum wind speeds is just-0.36 m/s,and the root mean square error (RMSE) is 2.22 m/s.The model can also simulate quite well the changes in wind directions of six meteorological stations in the East China when affected by Haikui.The RMSE of wind speeds is between 1.61 m/s and 6.92 m/s.Large errors appear at the stations near the center of typhoon,implying that the model dose not take adequate consideration to the complex terrain of East China,and needs further improvement in the future.
Keywords：synopticstyphoon wind fieldtyphoon wind field modeldrag coefficientwind risk assessment
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 188-197 )