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[1]NIU Yaobin,WU Xu,GAO Zhaoliang,et al.Spatial Variation of Rill Erosion Morphology on the Slope of Engineering Accumulation[J].Research of Soil and Water Conservation,2021,28(06):32-38.

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Spatial Variation of Rill Erosion Morphology on the Slope of Engineering Accumulation

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 32-38 Column: Public date: 2021-10-10

Title:: Spatial Variation of Rill Erosion Morphology on the Slope of Engineering Accumulation

Author(s):: NIU Yaobin¹，WU Xu¹，GAO Zhaoliang^2,3，BI Rutian¹，LÜ Chunjuan¹; (1.College of Resources and Environment，Shanxi Agricultural University，Taigu，Shanxi 030801，China; 2.Institute of Soil and Water Conservation，Chinese Academy of Sciences and Ministry of Water Resources，Yangling，Shaanxi 712100，China; 3.Institute of Soil and Water Conservation，Northwest A&F University，Yangling，Shaanxi 712100，China)

Keywords:: soil erosion; erosion morphology; spatial variation; engineering accumulation; rill

CLC:: S157.1

DOI:: -

Abstract:: In order to explore the spatial variation of rill morphology on slope of engineering accumulation，the relationships between rill morphology parameters and slope gradients and flow discharge were analyzed. In this study，scouring-erosion experiments were conducted on steep slopes of engineering accumulation under different slope gradients(24°，28° and 32°)with different flow discharges(5，9，13 and 17 L/min). The indicators such as rill length，rill wide and rill depth were used to describe the rill development process. The results indicate that the rill length develops fastest when flow discharge is 17 L/min under the slope gradients of 24° and 28°，while the development of rill length becomes slower with the increase of slope gradients under the same flow discharge; the rill width presents a differentiated development on the slope of 24° under all flow discharges，which can be divided into two stages: a rapid development stage in 1～6 m and a subsequent slow development stage in 6～9 m，while the slow development in 3～9 m of rill width on the slope gradients of 24° and 28° is observed under discharges of 5，9 and 13 L/min; under the experiment conditions，the development of rill depth on the slope shows a decreasing trend，and the fluctuation is concentrated in 1～5 m; the averages of rill width and depth both increase with increase of flow discharge under the same slope condition; in contrast，except for 5 L/min，there are no significant differences in average of rill width and depth between slope gradients under the same flow condition，indicating that the effect of flow discharge on rill morphology parameters is greater than that of slope gradient; the rill width develops basically consistent in different positions of the slope，while the rill depth presents a decreasing trend from the upslope to downslope; the rill erosion morphology on the slope of engineering accumulation can be classified as ‘wedge-shape'. These results have important implication for the reasonable allocation of protective measures on slope of engineering accumulation in production and construction projects.

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Last Update: 2021-10-10