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在野外试验基地进行了沙棘柔性坝拦沙效应试验。基于试验数据,分析了不同含沙水流条件下沙棘柔性坝对沿程含沙量及出入口悬沙粒径分布的影响,并探讨了沙棘柔性坝的阻力特性。结果表明,沙棘柔性坝对不同含沙水流的拦沙效果显著不同,对原型沙B的拦截效果最好,其次为原型沙A,最后为模型沙。对250~1 000μm粒径范围内的原型沙拦截效果最佳,且原型沙含沙量与中值粒径之间呈现正相关关系,对100~1 000μm粒径范围内的模型沙的拦截效果较好。各不同含沙水流条件下的沿程含沙量主要受沙棘柔性坝阻力的影响。本研究有助于深入理解沙棘柔性坝的拦沙效应,并对沙棘植物柔性坝这一生态工程在砒砂岩区沟道的推广应用提供理论依据。
In the field test base, the seabuckthorn flexible dam sediment effect test was carried out. Based on the experimental data, the influence of seabuckthorn flexible dam on sediment concentration and sediment particle size distribution at entrances and exits under different sediment flow conditions was analyzed, and the resistance characteristics of seabuckthorn flexible dam were discussed. The results show that the seabuckthorn flexible dam has significantly different sediment blocking effect on different sandy flows, the best interception effect on the prototype sand B, followed by the prototype sand A and finally the model sand. The intercepting effect on the prototype sand in the particle size range from 250 to 1 000 μm was the best, and the sand content of the prototype sand had a positive correlation with the median particle size. The interception effect on model sand in the particle size range from 100 to 1 000 μm better. The sediment concentration along the course of different sandy flows is mainly affected by the resistance of the seabuckthorn flexible dam. This study is helpful to understand deeply the sand-blocking effect of the seabuckthorn flexible dam and to provide a theoretical basis for the popularization and application of the seabuckthorn plant flexible dam as a channel in the sandstone area.