黄土丘陵区小流域淤地坝泥沙沉积特征

发布时间：2018-04-13 09:58

本文选题：土壤 + 泥沙　；参考：《农业工程学报》2017年03期

【摘要】：了解淤地坝泥沙沉积特征是坝地泥沙输移过程及规律研究的基础和前提。该文通过对黄土丘陵区小流域淤地坝不同位置泥沙沉积剖面中各沉积旋回层厚度及粒径组成变化的分析,研究了淤地坝次洪水沉积过程中泥沙的再分布特征。结果表明:坝地内次洪水泥沙沉积过程为非均匀分布,各沉积旋回层厚度在纵剖面和横剖面都存在一定差异,早期沉积层厚度的起伏变化要大于后期的起伏变化。坝地泥沙粒径组成以粉粒为主,黏粒、粉粒和沙粒的平均含量分别为4.66%、58.78%和36.56%。坝地泥沙沉积过程中,各旋回层中黏粒、粉粒和沙粒的平均含量变化较小,但在坝地不同位置,土壤粒径组成发生了一定程度的分选。从坝尾到坝前,土壤质地粗化度显著下降,土壤粒径组成呈逐步细化的趋势。
[Abstract]:Understanding the sediment characteristics of silt dam is the foundation and premise of the study of sediment transport process and law.Based on the analysis of the variation of sediment cycle thickness and particle size composition in silt dam profiles of small watershed in loess hilly region, the characteristics of sediment redistribution during secondary flood deposition of silt dams are studied in this paper.The results show that the secondary flood sediment deposition process in the dam is non-uniform, and the thickness of each sedimentary cycle is different in the longitudinal section and the transverse section, and the variation of the early sediment thickness is larger than that of the later period.The average content of clay, silt and sand is 4.66% and 36.56% respectively.In the process of sediment deposition, the average content of clay, silt and sand in each cyclic layer changed little, but the soil particle size composition was sorted to a certain extent in different positions of the dam.From the end of the dam to the front of the dam, the coarsening degree of soil texture decreased significantly, and the soil particle size composition showed a trend of gradual refinement.
【作者单位】：黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室;黄河水利委员会绥德水土保持科学试验站;
【基金】：国家自然科学基金(41371284)
【分类号】：S157.31

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