Authors

Abstract

The natural conditions in northwestern China are extremely harsh, with severe desertification. Frequent sandstorms cause significant damage to transportation infrastructure along desert margins, agricultural cash crops, and the local ecological environment. This study proposes a novel high vertical curved sand barrier system. Field experiments were conducted to validate numerical simulation results, and the properties of wind-driven sand movement and protective efficiency of these barriers were analyzed. Furthermore, double-row sand barriers with varying spacing were investigated to determine the optimal arrangement. The research demonstrates that flow deflection angle of the high vertical curved sand barrier relative to the vertical direction significantly impacts its protective efficiency, showing a fluctuating pattern with changing angles. When the inlet airflow speed reaches 10 m/s with a barrier inclination angle of 75°, the leeward deceleration zone achieves an area of 25.450 m² with a coverage range of 19.31H (where H represents barrier height), resulting in optimal overall protective efficiency. For double-row sand barriers, the protective efficiency is influenced by inter-barrier spacing. As the spacing between two rows increases, the protective efficiency initially improves before declining. The system reaches peak overall protective efficiency when the inter-barrier spacing is set at 20H.

Abstract in Chinese

中国西北地区的自然条件恶劣，荒漠化较为严重。沙尘暴天气频发，对沙漠边缘交通设施、农业经济作物和当地生态环境造成破坏。本文提出一种新型高立式曲线沙障，通过野外实验验证了数值模拟结果，并分析了高立式曲线沙障的风沙流特征和防护效率。对不同间距下的双排沙障进行研究，得出最优铺设间距。研究表明，高立式曲线沙障相对于垂直方向的角度显著影响新型沙障的防护效率，其防护效率随着角度的改变呈现波动格局。当入口风速为10m/s，沙障倾斜角度为75°时，沙障后方的减速区面积达到25.450 m2，覆盖范围为19.31H，沙障整体防护效率最佳。双排沙障的防护效率受到沙障间距的影响，随着两排沙障间距的增强，防护效率先增加后减小。当两排沙障间距达到20H时，沙障整体防护效率最优。