Flow field, sedimentation, and erosion characteristics around folded linear HDPE sheet sand fence: Numerical simulation study  

作　　者：ZHANG Kai ZHANG Hailong TIAN Jianjin QU Jianjun ZHANG Xingxin WANG Zhenghui XIAO jianhua 

机构地区：[1]College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730000,China [2]Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]College of Civil Engineering,Chongqing University,Chongqing 400045,China [4]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1期113-130,共18页山地科学学报（英文）

基　　金：financially supported by the Chang Jiang Scholar and Innovation Team Development Plan of China (IRT_15R29);the Basic Research Innovation Group Project of Gansu Province, China (21JR7RA347);the Natural Science Foundation of Gansu Province, China (20JR10RA231)。

摘　　要：Wind and sand hazards are serious in the Milan Gobi area of the Xinjiang section of the Korla Railway. In order to ensure the safe operation of railroads, there is a need for wind and sand protection in heavily sandy areas. The wind and sand flow in the region is notably bi-directional. To shield railroads from sand, a unique sand fence made of folded linear high-density polyethylene(HDPE) is used, aligning with the principle that the dominant wind direction is perpendicular to the fence. This study employed field observations and numerical simulations to investigate the effectiveness of these HDPE sand fences in altering flow field distribution and offering protection. It also explored how these fences affect the deposition and erosion of sand particles. Findings revealed a significant reduction in wind speed near the fence corner;the minimum horizontal wind speed on the leeward side of the first sand fence(LSF) decreased dramatically from 3 m/s to 0.64 m/s. The vortex area on the LSF markedly impacted horizontal wind speeds. Within the LSF, sand deposition was a primary occurrence. As wind speeds increased, the deposition zone shrank, whereas the positive erosion zone expanded. Close to the folded corners of the HDPE sand fence, there was a notable shift from the positive erosion zone to a deposition zone. Field tests and numerical simulations confirmed the high windproof efficiency(WE) and sand resistance efficiency(SE) in the HDPE sand fence. Folded linear HDPE sheet sand fence can effectively slow down the incoming flow and reduce the sand content, thus achieving good wind and sand protection. This study provides essential theoretical guidance for the design and improvement of wind and sand protection systems in railroad engineering.

关 键 词：Folded linear HDPE sheet sand fence Numerical simulation Flow field characteristics Protection benefits 

分 类 号：U216.413[交通运输工程—道路与铁道工程]