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[1]WANG Feichao,REN Zongping,LI Peng,et al.Effects of Freeze-Thaw on Soil Erosion and Sediment Under Simulated Rainfall[J].Research of Soil and Water Conservation,2018,25(01):72-75,83.

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Effects of Freeze-Thaw on Soil Erosion and Sediment Under Simulated Rainfall

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 01 Page number: 72-75,83 Column: Public date: 2018-02-28

Title:: Effects of Freeze-Thaw on Soil Erosion and Sediment Under Simulated Rainfall

Author(s):: WANG Feichao¹, REN Zongping¹, LI Peng¹, LI Zhanbin^1,2, WANG Tian¹, LI Lin¹, MA Tiantian¹; 1. State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an, 710048, 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:: simulated rainfall; freeze-thaw; runoff and sediment; loess soil

CLC:: S157.1

DOI:: -

Abstract:: In order to explore the effect of freeze-thaw on loess slope erosion under the condition of rainfall, the indoor rainfall simulator experiments was conducted to study the soil physical properties, runoff, sediment and runoff and sediment accumulation process before and after freeze-thaw. The results showed that:after freeze-thaw, the runoff-yielding time increased by 24.39%, the soil bulk density decreased by 3%, and the soil porosity increased by 2.98%, all were significant differences (p < 0.01); after freeze-thaw, the stable infiltration rate was 0.52 mm/min, and the runoff-yielding rate decreased by 10.59% during the first 10 minutes, the stable infiltration rate of loess slopes after freeze-thaw was 1.1 times of the slope without freeze-thaw, freeze-thaw may increase the amount of rainfall infiltration and reduce runoff. Looking from the total amount of sediment yield, the loess slope after freeze-thaw was 0.9 times of the loess slope without freeze-thaw. Larger amount of sediment was produced the under the less runoff on the loess slope after freeze-thaw. Freeze-thaw cumulative production and sediment yield appeared a liner increase with sediment concentration (y=ax-b). The parameter a in the linear equation can be used as one of the erodability indicators of the slope. The results may provide a supplement for improving the erosion mechanisms of slope soil.

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