水蚀风蚀交错带小流域淤地坝泥沙沉积特征
发布时间：2019-04-28 16:28
【摘要】：淤地坝泥沙沉积特征是小流域土壤侵蚀及坝地内泥沙运移沉积过程的信息载体。通过对水蚀风蚀交错带典型坝地内不同剖面中泥沙沉积旋回厚度及粒径组成变化的分析,初步探讨了坝地内泥沙沉积空间分布特征及对小流域土壤侵蚀和泥沙运移沉积过程的响应。结果表明:坝地泥沙沉积旋回厚度从坝尾到坝前呈现不均匀变化,但沉积旋回厚度总体呈逐渐变薄的趋势,沉积旋回中沙层厚度普遍大于粘层厚度;坝地内不同剖面沉积旋回泥沙主要由细砂粒组成,其平均含量为59.8%,其次为粉砂粒(23.4%),黏粒(11.2%)和粗砂粒(5.6%)含量较少;从坝前到坝尾各个剖面中沉积泥沙颗粒组成粗化度逐渐增大,且沉积旋回中沙层的粗化度变化大于粘层的变化。初步揭示了淤地坝沉积泥沙从坝尾到坝前的沉积规律,可以为以后相关工作的开展提供参考。
[Abstract]:Sediment deposition characteristics of siltation dam are the information carrier of small watershed soil erosion and sediment transport and deposition process in dam site. The variation of sediment sedimentation cycle thickness and particle size composition in different sections of typical dam sites in the water erosion wind erosion interlaced zone is analyzed. The spatial distribution characteristics of sediment deposition in the dam site and its response to soil erosion and sediment transport in small watershed are discussed. The results show that the thickness of sediment cycle varies unevenly from the dam tail to the front of the dam, but the thickness of the sediment cycle generally becomes thinner, and the thickness of sand layer in the sediment cycle is generally larger than that of the cohesive layer. The sediment in different sections of the dam is mainly composed of fine sand, and its average content is 59.8%, followed by silty sand (23.4%), clay (11.2%) and coarse sand (5.6%), and the average content of sediment is 59.8%, followed by silt (23.4%), clay (11.2%) and coarse sand (5.6%). The coarsening degree of sediment particles in each section from the front of the dam to the tail of the dam increases gradually, and the variation of the coarsening degree of the sediment in the sedimentary cycle is greater than that of the cohesive layer. The sedimentation law of sediment from the tail to the front of the dam is revealed preliminarily, which can be used as a reference for the development of the related work in the future.
【作者单位】： 西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院水利部水土保持研究所;
【基金】：国家自然科学资助项目(41671281;41571130082;41371283) 黄土高原土壤侵蚀与旱地农业国家重点实验室专项经费(A314021403-C2) 西北农林科技大学科技创新一般项目(2452015095)
【分类号】：S157
本文编号：2467785
[Abstract]:Sediment deposition characteristics of siltation dam are the information carrier of small watershed soil erosion and sediment transport and deposition process in dam site. The variation of sediment sedimentation cycle thickness and particle size composition in different sections of typical dam sites in the water erosion wind erosion interlaced zone is analyzed. The spatial distribution characteristics of sediment deposition in the dam site and its response to soil erosion and sediment transport in small watershed are discussed. The results show that the thickness of sediment cycle varies unevenly from the dam tail to the front of the dam, but the thickness of the sediment cycle generally becomes thinner, and the thickness of sand layer in the sediment cycle is generally larger than that of the cohesive layer. The sediment in different sections of the dam is mainly composed of fine sand, and its average content is 59.8%, followed by silty sand (23.4%), clay (11.2%) and coarse sand (5.6%), and the average content of sediment is 59.8%, followed by silt (23.4%), clay (11.2%) and coarse sand (5.6%). The coarsening degree of sediment particles in each section from the front of the dam to the tail of the dam increases gradually, and the variation of the coarsening degree of the sediment in the sedimentary cycle is greater than that of the cohesive layer. The sedimentation law of sediment from the tail to the front of the dam is revealed preliminarily, which can be used as a reference for the development of the related work in the future.
【作者单位】： 西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院水利部水土保持研究所;
【基金】：国家自然科学资助项目(41671281;41571130082;41371283) 黄土高原土壤侵蚀与旱地农业国家重点实验室专项经费(A314021403-C2) 西北农林科技大学科技创新一般项目(2452015095)
【分类号】：S157
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