Protective benefits of HDPE board sand fences in an environment with variable wind directions on Gobi surfaces:wind tunnel study  

作　　者：ZHANG Kai TIAN Jianjin LIU Benli ZHAO Yanhua ZHANG Hailong WANG Zhenghui DENG Yuhui 

机构地区：[1]College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730000,China [2]Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Journal of Mountain Science》2024年第10期3353-3367,共15页山地科学学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China (42461011, 42071014);the Fellowship of the China Postdoctoral Science Foundation (2021M703466)

摘　　要：The Golmud-Korla Railway in the Gobi area faces operational challenges due to sand hazards,caused by strong and variable winds.This study addresses these challenges by conducting wind tunnel tests to evaluate the protective benefits of High Density Polyethylene(HDPE)board sand fences,focusing on their orientation relative to various wind directions(referred to as'wind angle').This study found that the size of the low-velocity zone on the leeward side of the sand fences(LSF)expanded with an increase in the wind angle(WA).At 1H(the height of the sand fence)and 2H positions on the LSF,the wind speed profiles(WSP)exhibited a segmented logarithmic growth,constrained by Z=H at varying WAs.The efficacy of the sand fence in obstructing airflow escalated as WA increased.The size of the WA has a significant impact on the protective efficiency of HDPE board sand fences.Furthermore,compared to typical sandy surfaces,the rate of sand transport across the Gobi surface diminishes more slowly with height,attributed to the gravel's rebound effect.This phenomenon allows some sand particles to bypass the fences,rendering them less effective at blocking wind and trapping sand than in sandy environments.This paper offers scientific evidence supporting the practical use and enhancement of HDPE board sand fences in varied wind conditions.

关 键 词：Variable wind directions Blown sand control Wind tunnel tests HDPE board sand fences 

分 类 号：X171.4[环境科学与工程—环境科学] P425.55[天文地球—大气科学及气象学]