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以2种典型黄土为研究对象,在模拟降雨条件下,研究了不同雨强和坡度条件下侵蚀过程中黏粒含量的变化规律,比较了泥沙侵蚀颗粒(未分散)和泥沙原始颗粒(分散后)大小分布特征,分析了团聚率和富集率.结果表明,泥沙侵蚀黏粒含量随着坡长和雨强的增大而增加,黄绵土变化明显,增加了8.77%和2.43%;而塿土只增加了2.76%和0.4%.随坡度的增大而减小,分别减少了4.91%和3.93%.黏粒团聚率<1,富集率>1,在侵蚀搬运过程中作为黏粒团被搬运,导致黏粒的富集.研究结果有助于深入了解泥沙颗粒在坡面侵蚀过程中的变化规律,深入理解土壤侵蚀机制,也能为面源污染模型的建立提供重要基础.
Taking the two kinds of typical loess as the research object, under the condition of simulated rainfall, the variation regularity of the clay content in the process of erosion under different rainfall intensity and gradient was studied. The sediment erosion particles (undispersed) and sediment original particles The results showed that the content of sediment erosion clay increases with the increase of slope length and rainfall intensity, and the change of the loessial soil obviously increases with an increase of 8.77% and 2.43%, respectively. While the clay content increased by only 2.76% and 0.4%, decreased with the increase of slope, decreased by 4.91% and 3.93% respectively. The clay agglomeration rate was less than 1, the enrichment rate was> 1, The pellets are transported, resulting in the accumulation of clay particles.The results of the study are helpful to understand deeply the variation regularity of sediment particles in the process of slope erosion, and further understand the mechanism of soil erosion and provide an important foundation for the establishment of non-point source pollution model .