Abstract
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.
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Availability of Data/Materials: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
The research described in this paper was 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), and the Natural Science Foundation of Gansu Province, China (20JR10RA231).
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ZHANG Kai: methodology, data curation, writing-review and editing, conceptualization. ZHANG Hailong: writing-original draft, data curation, investigation. TIAN Jianjin: validation, visualization. QU Jianjun: supervision, funding acquisition. ZHANG Xingxin: conceptualization, visualization. WANG Zheng-hui: investigation, resources. XIAO jianhua: funding acquisition, Supervision.
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Zhang, K., Zhang, H., Tian, J. et al. Flow field, sedimentation, and erosion characteristics around folded linear HDPE sheet sand fence: Numerical simulation study. J. Mt. Sci. 21, 113–130 (2024). https://doi.org/10.1007/s11629-023-8259-3
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DOI: https://doi.org/10.1007/s11629-023-8259-3