低立式纤维沙袋沙障防风固沙效应研究

Effect of the Low-Fiber Sandbag Sand-Barrier on Wind-Breaking and Sand-Fixation

纤维材料沙袋沙障是一种新兴的固沙材料,具有施工运输方便,可重复利用等优点。通过在古兰泰铺设纤维沙袋沙障,分析了1m×1m不同孔隙度(15%,25%,35%)三种规格对风速廓线、输沙量、粗糙度等的影响。得出了低立式纤维材料沙袋沙障具有明显的防风固沙效应,三种规格沙障对风沙流结构的影响不同,35%规格对风的削弱作用最强;三种规格都具有明显的控制风蚀基准面作用,其中15%规格的对风蚀基准面的控制最稳定;由于沙袋的特殊性,其障内地表曲面不同于一般格状沙障的稳定凹曲面,与风向有一定的相关性。

The fiber material is a new sand-fixation material. It has characteristic properties of convenient transport and reuse. This paper mainly studied the effect of the low-fiber sandbag sand-barrier on wind- breaking and sand-fixation, and analyzed the effect of wind speed profile, sediment and surface roughness about three different porosities （15%, 25%, 35%） ofl m×1 m. Asaresult, the effect of thelow-fibersand- bag sand-barrier has the obvious effect on wind breaking and sand-fixation. Different specifications have different impacts. The specification of 35% has obvious ability to low wind speed. All the three means have control erosion base level, especially the specification of 15% is very good for controlling the base level of erosion. In the sand barrier, the ground surfers are different from those of others sand barriers, and have cor relation with wind directions.