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[1]Li Shuang,Zhang Qiufen,Zheng Yuexin,et al.Analysis of Runoff-Sediment Scale Transfer Effect on Slope Surface of Loess Hilly Region and Its Influencing Factors[J].Research of Soil and Water Conservation,2024,31(04):1-10.[doi:10.13869/j.cnki.rswc.2024.04.005]

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Analysis of Runoff-Sediment Scale Transfer Effect on Slope Surface of Loess Hilly Region and Its Influencing Factors

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 04 Page number: 1-10 Column: Public date: 2024-06-30

Title:: Analysis of Runoff-Sediment Scale Transfer Effect on Slope Surface of Loess Hilly Region and Its Influencing Factors

Author(s):: Li Shuang¹, Zhang Qiufen², Zheng Yuexin¹, Yu Jingshan^1,3, Yao Xiaolei¹, Han Feifei¹; (1.Digital Watershed Laboratory, College of Water Science, Beijing Normal University, Beijing 100875, China; 2.Henan Key Laboratory of Ecological Environment Protection and Restoration of Yellow River Basin, Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou 450003, China; 3.State Environmental Protection Key Laboratory of Land and Sea Ecological Governance and Systematic Regulation, Shandong Academy for Environmental Planning, Jinan 250101, China)

Keywords:: soil and water loss; scale effect; scale transfer efficiency; runoff and sediment transport

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.04.005

Abstract:: [Objective]The aims of this study are to explore the scale effect in the process of runoff and sediment movement on the slope, to clarify the scale effect influence mechanism of runoff and sediment movement in the hilly and gully region of the Loess Plateau, so as to provide scientific support for the study of runoff and sediment transfer mechanism and the comprehensive management of runoff and sediment in the Yellow River Basin. [Methods]Based on the runoff and sediment data of four runoff fields in Zizhou runoff test station of the Yellow River, the scale transfer effect of runoff and sediment yield on slope was revealed by comparing and analyzing the runoff and sediment yield processes of different slope lengths under rainfall events. The concept of scale transfer efficiency was proposed to characterize the runoff and sediment transfer relationship between the upper and lower levels, and to further explore the influencing factors on runoff and sediment transfer efficiency. [Results](1)The characteristics of different rainfall types had different effects on the runoff and sediment yield on the slope. The rainfall duration mainly affected the runoff and sediment yield on the slope, and the average rainfall intensity mainly affected the starting time of runoff and sediment yield on the slope.(2)Under the event of rainfall, the runoff transfer of different slope lengths was an ideal equilibrium transfer mechanism, and with the increase of slope length, the transfer capacity of runoff showed a decreasing trend. Under the condition of 40～60 m slope length, the transfer of sediment was a non-equilibrium transfer process. With the increase of slope length, the transfer capacity of sediment increased first and then decreased.(3)The influencing factors on flow-sediment transfer efficiency on different scale slopes were different. Runoff depth, average rainfall intensity and surface soil moisture content after rain were the main factors affecting the transfer efficiency of flow-sediment scale. [Conclusion]The runoff and sediment yield capacity of the slope in the loess hilly and gully region is affected by rainfall characteristics and slope length. There is a significant scale effect of damage or gain in the transmission of runoff and sediment along the way. The efficiency of water and sediment transport is regulated by multiple factors such as rainfall intensity, runoff and soil moisture.

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Last Update: 2024-06-30