Numerical simulation on sand sedimentation and erosion characteristics around HDPE sheet sand barrier under different wind angles

作     者：ZHANG Kai ZHANG Peili ZHANG Hailong TIAN Jianjin WANG Zhenghui XIAO Jianhua ZHANG Kai;ZHANG Peili;ZHANG Hailong;TIAN Jianjin;WANG Zhenghui;XIAO Jianhua

作者机构：College of Civil EngineeringLanzhou Jiaotong UniversityLanzhou 730000China Key Laboratory of Desert and DesertificationNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2024年第21卷第2期

页      面：538-554页

核心收录：

学科分类：08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：financially supported by the Natural Science Foundation of Gansu Province,China(22JR5RA050,20JR10RA231) the fellowship of the China Postdoctoral Science Foundation(2021M703466) the Basic Research Innovation Group Project of Gansu Province,China(21JR7RA347) 

主　　题：Multi-wind direction HDPE sheet sand barrier Numerical simulation Windproof efficiency Sedimentation erosion 

摘      要：For the safety of railroad operations,sand barriers are utilized to mitigate wind-sand disaster *** disasters,characterized by multi-directional wind patterns,result in diverse angles among the *** this study,using numerical simulations,we examined the behavior of High Density Polyethylene(HDPE)sheet sand barriers under different wind angles,focusing on flow field distribution,windproof efficiency,and sedimentation erosion *** study discovered that at a steady wind speed,airflow velocity varies as the angle between the airflow and the HDPE barrier ***,a 90°angle results in the widest low-speed airflow area on the barrier’s downwind *** the airflow is not perpendicular to the barrier,it prompts a lateral airflow movement which decreases as the angle *** windproof efficiency correlates directly with this angle but inversely with the wind’s ***,with a wind angle of 90°,wind speed drops by 81%.The minimum wind speed is found at 5.1H(the sand barrier height)on the barrier’s downwind *** the angle grows,the barrier’s windproof efficiency improves,extending its protective *** is most prominent on the barrier’s downwind side,as the wind angle shifts from 30°to 90°,the sand sedimentation area on the barrier’s downwind side enlarges by *** the angle grows,sedimentation intensifies,eventually overtakes the forward erosion and enlarges the sedimentation area.