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[1]GUO Kai,LI Xuantian,ZHANG Fengbao,et al.Influence of Rainfall Patterns and Slope Lengths on the Characteristics of Eroded Sediment Particle Sizes[J].Research of Soil and Water Conservation,2023,30(02):50-57,66.[doi:10.13869/j.cnki.rswc.2023.02.054]

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Influence of Rainfall Patterns and Slope Lengths on the Characteristics of Eroded Sediment Particle Sizes

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 50-57,66 Column: Public date: 2023-03-10

Title:: Influence of Rainfall Patterns and Slope Lengths on the Characteristics of Eroded Sediment Particle Sizes

Author(s):: GUO Kai¹, LI Xuantian¹, ZHANG Fengbao^1,2, SHEN Nan^1,2, YANG Mingyi^1,2; (1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China)

Keywords:: rainfall pattern; slope length; particle size distribution; Loess Plateau; sediment transport

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.02.054

Abstract:: To illustrate the influence of different rainfall patterns and slope lengths on the dispersion of soil particles, we took field plots with different slope lengths as the research objects and combined with data of 82 rainfall events to classify rainfalls as 3 types(type A: heavy rainfall, high rain intensity, high erodibility; type B: medium rainfall, light rain intensity, medium erodibility; type C: low rainfall, medium rain strong, medium and low erosion)by using hierarchy cluster based on rainfall(P, mm), maximum 30 min rainfall intensity(I₃₀, mm/h), and rainfall erodibility 〔R, MJ·mm/(hm²·h)〕. The particle size distribution characteristics of eroded sediments in 11 rainfall events were analyzed. The results showed that:(1)the composition of eroded sediment particles was affected by different rainfall patterns; the contents of effective and ultimate clay were the highest under type C, and the contents of effective and ultimate sand were the highest under type B, the content of effective silt was the highest under type A, and the content of ultimate silt was the highest under type C;(2)there was a critical slope length effect(14 m)on the distribution of sediment particles; when the slope length was shorter than the threshold, the contents of clay and silt particles decreased with the increase of slope length; and it would increase with the slope length while the slope length was longer than the threshold; the effect on the ultimate particle size was even more significant;(3)the transport of sand particle was greatly affected by the rainfall type and slope length; under the rainfall type B, the transport of effective sand was mainly in the form of aggregated particle, while in the rainfall types A and C, it was transported in the form of single particle at the critical slope length. The effective particles of eroded sediment are finer compared with the original soil, while the ultimate particles were coarser. On the whole, the particle size characteristics of eroded sediment are affected by different rainfall types and slope lengths significantly. The effective particle size of eroded sediment tends to be finer, while the ultimate particle size tends to coarsen, and there is a threshold effect for the slope length on sediment particles.

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Last Update: 2023-03-10