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风是影响土壤风蚀及风沙害强度的核心因子,在研究道路工程路域风力侵蚀规律及控制方法时,各类重塑地貌单元对近地表风况影响的研究至关重要。以集宁至二连浩特段铁路为依托,针对道路工程建设中不同重塑地貌单元对近地表风速的影响进行了野外观测试验。结果表明,近地表在受到各种地形单元的影响后,其风速廓线仍然满足对数规律或分段对数规律,只不过对数表达式中的有效高程不再是测点处地面绝对高程;水平风速场因地形变化而变化,迎风边坡由坡底到坡顶风速逐渐增加,其增加比例与坡长成线性函数关系;背风边坡上风速从坡顶至坡脚变化为先是在坡顶下方急剧减小,然后再缓慢减小的过程。
Wind is the core factor that affects soil wind erosion and wind-sand damage intensity. It is very important to study the influence of various remodeled landform units on the near-surface wind conditions when studying the law of wind erosion and road surface control. Based on the Jining-Erlian-Haotian railway, field experiments were carried out to investigate the effects of different remodeled landforms on the near-surface wind speed in road construction. The results show that after being affected by all kinds of terrain elements, the near-surface wind speed profile still satisfies the law of logarithm or piecewise logarithm, except that the effective elevation in the logarithm expression is no longer the absolute elevation of the ground at the measuring point ; The horizontal wind speed field changed due to the change of the terrain; the wind speed of the windward slope from the bottom of the slope to the top of the slope increased gradually; the increase proportion of the windward slope was linear with the slope length; the wind speed on the leeward slope changed from the top of the slope to the slope, Top down sharply reduced, and then slowly reduce the process.