水蝕風(fēng)蝕交錯帶小流域淤地壩泥沙沉積特征
[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.
【作者單位】: 西北農(nóng)林科技大學(xué)水土保持研究所黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院水利部水土保持研究所;
【基金】:國家自然科學(xué)資助項(xiàng)目(41671281;41571130082;41371283) 黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室專項(xiàng)經(jīng)費(fèi)(A314021403-C2) 西北農(nóng)林科技大學(xué)科技創(chuàng)新一般項(xiàng)目(2452015095)
【分類號】:S157
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