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[1]QI Xingyuan,GAO Zhaoliang,ZHANG Xiang,et al.Rill Dynamic Development Process of Loess Engineering Accumulation With Variable Slope Length[J].Research of Soil and Water Conservation,2019,26(03):42-48.

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Rill Dynamic Development Process of Loess Engineering Accumulation With Variable Slope Length

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 03 Page number: 42-48 Column: Public date: 2019-04-12

Title:: Rill Dynamic Development Process of Loess Engineering Accumulation With Variable Slope Length

Author(s):: QI Xingyuan¹, GAO Zhaoliang^1,2, ZHANG Xiang³, LI Yonghong¹, LI Yutingting¹; 1. Institute of Soil and Water Conservation, North A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. Pingxiang University, Pingxiang, Jiangxi 33700, China

Keywords:: engineering accumulation; rill dynamic development; scouring-erosion; eroding sediment

CLC:: S157.1

DOI:: -

Abstract:: In order to revel the impact of engineering accumulation platform catchment to the dynamic development of rill on variable slope length,scouring-erosion experiments were conducted. These were based on the example of the steep slope of the engineering accumulation at Yangling Soil and Water Conservation Field Science Experiment Station of Institute of Soil and Water Conservation, Chinese Academy of Sciences,and three slopes (24°, 28°, 32°), four slopes length (8 m, 12 m, 16 m and 20 m) and four flow rates (12 L/min, 18 L/min, 24 L/min, 30 L/min) were designed to analyze rill dynamic development process of loess accumulation under variable slope length. The results showed that:(1) the rill width and depth both increased with time of eroding (30 minutes), and showed logarithmic function relationship; the rill width developed rapidly at 0~9 minutes, accounting for 64%~88% of the final rill width; the rill depth developed rapidly at 0~15 minutes, accounting for 68%~84% of the final rill depth; (2) the width-depth ratio of rill showed first increased and then slowed down, finally stabilized at 1.54~2.56, and shape of the rill was V-shape finally; (3) the contribution rate of sediment in the platform-steep slope transition zone and the upper part of the slope were as high as 60.36%, which was an area prone to soil erosion; (4) the change of slope length had a significant effect on the width and depth of the rill, and the regularity was obvious, it had an impact on the width-depth ratio of the rill but had no obvious regularity, and had little effect on the contribution rate of the sediment in the section. The research results can provide references for revealing the regularity of sediment production on the slope of engineering accumulation and the configuration of prevention and control measures for soil erosion.

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