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Effects of sand sedimentation and wind erosion around sand barrier:Numerical simulation and wind tunnel test studies

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Journal of Mountain Science 2023年第4期20卷 962-978页

作者： ZHANG Kai ZHANG Hai-long DENG Yu-hui QU Jian-jun WANG Zheng-hui LI Sheng College of Civil Engineering Lanzhou Jiaotong UniversityLanzhou730000China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China

Based on numerical simulations,this study highlights the sedimentation and erosion problems around a sand barrier through the relationship between the shear stress of the surface around the sand barrier and the critical shear stress of sand *** numerical simulation results were verified using data measured by the wind tunnel *** results showed that when the porosity was the same,the size and position of the vortex on the leeward side of the sand barrier were related to the inlet wind *** the wind speed increased,the vortex volume increased and the positions of the separation and reattachment points moved toward the leeward *** the porosity of the sand barrier was 30%,the strength of the acceleration zone above the sand barrier was the highest,and the strength of the acceleration zone was negatively correlated with the *** erosion and sedimentation distance were related to wind *** an increase in wind speed,the sand grain forward erosion or reverse erosion areas on the leeward side of the sand barrier gradually replaced the sedimentation *** an increase in porosity,the sand sedimentation distance on the leeward side of the sand barrier gradually shortened,and the sand erosion area gradually *** sand sedimentation distance on the leeward side of the sand barrier with 30%porosity was the *** numerical simulation results were in good agreement with the wind tunnel test *** on the sand erosion and sedimentation results of the numerical simulation and wind tunnel test,when the porosity was 30%,the protection effect of the High Density Polyethylene(HDPE)board sand barrier was best.

关键词： sand sedimentation Wind erosion Numerical simulation Wind tunnel test

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Numerical simulation on flow field,wind erosion and sand sedimentation patterns over railway subgrades

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Journal of Mountain Science 2022年第10期19卷 2968-2986页

作者： ZHANG Kai ZHAO Li-ming ZHANG Hai-long GUO Ao-jun YANG Bo LI Sheng College of Civil Engineering Lanzhou Jiaotong UniversityLanzhou 730000China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

The railway subgrades in the sandy areas act as an obstacle interfering wind-blown sand,causing sand erosion and sedimentation,which can disrupt the safe and stable operation of the railway *** previous studies mainly focus on the flow field around railway subgrades,however,the real erosion and sedimentation patterns are rarely *** study aims to analyze the erosion and sand sedimentation patterns of wind-blown sand over the subgrades with different heights and steel rails using the ratio of the wall shear stress to the critical value of erosion shear *** show that wind erosion near the top of the upwind slope of the embankment and the shoulder on the upwind side are more severe,and the severity increases with an increase in the height of the *** the increase of wind velocity,sand sedimentation both on the windward and leeside of the subgrade decreases and wind erosion by reverse flow *** study indicates that railways in sandy areas should be constructed with a moderate subgrade height(4 m).

关键词： Numerical simulation Flow field Wind erosion sand sedimentation Railway subgrades Subgrade height

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维普期刊数据库

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