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风沙区道路工程路域近地表风的运动特性

, PP. 25-31

Keywords: 道路工程,风场特性,野外观测试验,近地表风,风沙区

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Abstract:

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。

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