A theoretical method to characterize the resistance effects of nonflat terrain on wind fields in a parametric wind field model for tropical cyclones

作     者：Gengjiao Ye Pingzhi Fang Hui Yu 

作者机构：Shanghai Typhoon Institute of China Meteorological AdministrationShanghaiChina Key Laboratory of Numerical Modeling for Tropical Cyclone/CMAShanghaiChina School of Geography SciencesEast China Normal UniversityShanghaiChina Asia-Pacific Typhoon Collaborative Research CenterShanghaiChina 

出 版 物：《Tropical Cyclone Research and Review》 (热带气旋研究与评论（英文版）)

年 卷 期：2024年第13卷第3期

页      面：161-174页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the Key Program of National Natural Science Foundation of China (Grant No.U2142206) the Shanghai Science and Technology Commission Project (Grant No.23DZ204701) the Natural Science Foundation of Shanghai (Grant No.19ZR1469200) 

主　　题：Parametric wind field model Tropical cyclones Nonflat terrain Slope angle Terrain drag coefficient Pressure coefficient 

摘      要：Traditionally,an empirical speed-up factor was introduced to reflect the effects of nonflat terrain on near-surface wind *** this paper,the resistance effects of nonflat terrain are considered by introducing the terrain drag coefficient in the parametric wind field model for tropical cyclones(TCs)with a theoretical *** effects on wind fields are investigated in complex areas along the coastal zone in China under TC *** results show that the terrain drag coefficient is the function of the slope angle and is sensitive to the spatial *** including the resistance effect of nonflat terrain,the TC intensities weaken overall during landfall,with a slight enhancement near the coastal *** wind speeds outside the radius of the maximum wind speed decrease,while the wind speeds within the radius of the maximum wind speed *** the TC eye and the radius of maximum wind speed shrink,which is more obvious when the TC center is entirely over *** a result,the location and magnitude of the maximum wind speed are affected by the nonflat *** changed structure of the wind fields demonstrates the necessity of considering the effects of nonflat terrain in simulating the wind fields under TC conditions.