沙棘柔性坝对砒砂岩沟道泥沙粒径分布及有机质影响

发布时间：2018-06-23 18:31

本文选题：沙棘“柔性坝” + 砒砂岩区　；参考：《水土保持学报》2017年05期

【摘要】：为了进一步研究沙棘"柔性坝"对砒砂岩沟道泥沙的影响,基于内蒙古砒砂岩地区沙棘"柔性坝"野外试验,根据单座沙棘"柔性坝"一次降雨淤积后的试验数据,运用对比分析的方法,研究了沙棘"柔性坝"对砒砂岩沟道泥沙粒径分布及有机质的影响及其拦沙效果。结果表明:单座沙棘"柔性坝"能够提高砒砂岩沟道泥沙有机质含量,具有淤粗排细的分选功能和良好的拦沙效果。泥沙有机质从沙棘"柔性坝"上游到下游逐渐增加,沿泥沙剖面表现出先增后减的趋势;泥沙粒径从沟道上游到下游先增大后减小,沿一次降雨淤积的泥沙剖面也表现出先增后减的趋势;暴雨后沙棘"柔性坝"单位面积淤积泥沙的平均厚度为0.369m,与对比沟相比,淤积的泥沙厚度明显较高。
[Abstract]:In order to further study the influence of seabuckthorn "flexible dam" on the silt in the channel of arsenitic sandstone, based on the field test of the "flexible dam" of seabuckthorn in Inner Mongolia, according to the experimental data of single seabuckthorn "flexible dam" after one rainfall deposition, The effect of "flexible dam" of seabuckthorn on sediment particle size distribution and organic matter distribution in the channel of arsenitic sandstone and its effect on sediment retention were studied by means of comparative analysis. The results show that the single seabuckthorn "flexible dam" can increase the content of organic matter of sediment in the channel of arsenopyrite, and has the function of separating silt, coarse and fine, and the good effect of sediment retention. The organic matter of sediment increases gradually from the upstream to the downstream of the seabuckthorn "flexible dam", and along the sediment profile it shows a trend of first increasing and then decreasing, and the grain size of sediment increases first and then decreases from the upstream to the downstream of the channel. The sediment profile along a single rainfall also shows a tendency of increasing first and then decreasing, and the average thickness of sediment deposition per unit area of seabuckthorn "flexible dam" after heavy rain is 0.369 m, which is obviously higher than that of contrast gully.
【作者单位】：西北大学城市与环境学院;西安理工大学西北旱区生态水利工程国家重点实验室培育基地;
【基金】：国家自然科学基金项目(51279163) 西北旱区生态水利工程国家重点实验室培育基地项目(2016KFKT-4)(西安理工大学) 陕西省自然科学基金项目(2010JQ5003)
【分类号】：S157.43

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