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为了深入研究沙棘“柔性坝”生态措施的阻水拦沙作用,在陕西眉县野外实验基地进行了沙棘“柔性坝”拦沙试验,分析与探讨了不同种植参数对砒砂岩沟道水流含沙量及粒径分布的影响。水流含沙量及粒径分布的沿程变化表明:不同参数下“柔性坝”含沙量的总体趋势为从上游到下游是逐渐减少的。坝体的上部位置含沙量逐渐减少,到了坝体中部含沙量则会增大,最后在坝体下部部位又逐渐减少,并且当坝长适中时拦沙效果才最显著,但随着坡度的不断变陡,拦沙的效果反而降低。沙棘“柔性坝”中,沿水流方向泥沙粒径呈递减趋势,并且对于粒径大于2.5μm的颗粒泥沙具有分选效果。文中研究有助于人们深入理解沙棘柔性坝滞流拦沙作用,为沙棘柔性坝这一生态工程在砒砂岩地区的推广提供理论依据。
In order to further study the function of water and sediment control of seabuckthorn “flexible dam ” ecological measures, the seabuckthorn “flexible dam ” sand tracing experiment was carried out in the field experiment site of Mei County in Shaanxi Province. The effects of different planting parameters on the sandstone ditch Influence of sediment concentration and particle size distribution of channel flow. The variation of sediment concentration and particle size distribution shows that the overall trend of sediment concentration under different parameters is decreasing from upstream to downstream. The content of sediment in the upper part of the dam gradually decreases and the content of sediment in the middle part of the dam will increase and finally decrease gradually in the lower part of the dam. When the dam length is moderate, the sediment effect is the most significant. However, Constantly steep, but the effect of sediment reduction. In seabuckthorn “flexible dam”, the sediment particle size decreases along the flow direction, and it has the sorting effect for the granular sediment whose particle size is more than 2.5μm. The research in this paper will help people understand deeply the function of stagnant flow and sediment control of seabuckthorn flexible dam and provide a theoretical basis for popularizing the seabuckthorn flexible dam as an ecological project in 砒 sandstone area.