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[1]LI Long,ZHANG Shangxuan,HE Jun,et al.Development of Rill Morphology on Sandstone Slopes Under Individual Rainfall Event and Its Effect on Erosion and Sediment Production[J].Research of Soil and Water Conservation,2023,30(03):1-9.[doi:10.13869/j.cnki.rswc.2023.03.008]

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Development of Rill Morphology on Sandstone Slopes Under Individual Rainfall Event and Its Effect on Erosion and Sediment Production

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 1-9 Column: Public date: 2023-04-10

Title:: Development of Rill Morphology on Sandstone Slopes Under Individual Rainfall Event and Its Effect on Erosion and Sediment Production

Author(s):: LI Long^1,2, ZHANG Shangxuan¹, HE Jun³, LI Qiang⁴, YUAN Liang⁴; (1.College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;2.Key Laboratory of State Forest Administration for Desert Ecosystem Protection and Restoration,Hohhot 010000,China;3.School of Remote Sensing & Geomatics Engineering Nanjing University of Information Science and Technology,Nanjing Jiangsu,210044;4.Erdos Forestry and Grass Business Development Center,Erdos,Inner Mongolia 017000,China;5.Environmental Protection Department......)

Keywords:: rainfall; slope; rill morphology; runoff; sediment yield

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.03.008

Abstract:: [Objective]The exposed slope was selected to reveal the evolution of the pattern of rill and the characteristics of erosion-induced sediment generation on the slope, in order to provide theoretical basis for the development of slope terrain and soil erosion management. [Methods] Rill development and runoff and sediment production under 13 natural rainfall events in two rainy seasons were analyzed based on in situ detection conducted by using the three-dimensional laser scanner under the natural rainfall conditions in the field. [Results](1)Rill development can be divided into four stages: drop ridge development-intermittent rill-continuous rill-furrow network formation(2)The length, width, depth and volume of rill, density of fine rills, and complexity of rills all show the increasing trend with the continuation of rainfall, while the ratio of width to depth of rill shows the decreasing trend.(3)The largest contribution to its development is the medium rainfall with the frequency of 53.69%, and the effect of medium rainfall on rill morphology accounts for 71.25%. [Conclusion]The change of rill morphology has a greater impact on sediment production, and sediment production increases significantly after the appearance of rills, and sediment production corresponds well with the development process of rills, while the impact on the runoff production process is limited. In particular, the correlation between rill volume and sediment production and sediment content is the strongest.

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Last Update: 2023-04-10