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[1]Sun Xiao,Wang Shuai,Lyu Xizhi.Effect of grass cover on rill erosion morphology on loess slopes using terrain scanning technology[J].Research of Soil and Water Conservation,2025,32(06):11-20.[doi:10.13869/j.cnki.rswc.2025.06.006]

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Effect of grass cover on rill erosion morphology on loess slopes using terrain scanning technology

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 11-20 Column: Public date: 2025-10-20

Title:: Effect of grass cover on rill erosion morphology on loess slopes using terrain scanning technology

Author(s):: Sun Xiao¹,Wang Shuai^2,3,Lyu Xizhi²; (1.China TopRS(Beijing) Technology Co.,Ltd.,Beijing 100083,China;2.Henan Key Laboratory of YellowBasin Ecological Protection and Restoration,Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China;3.School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China)

Keywords:: loess slopes; grass cover patterns; erosion rate; rill morphological parameters; 3D laser scanning technology; GIS technology

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2025.06.006

Abstract:: [Objective] The development of rill morphology directly reflects slope erosion severity. This study aims to explore the effects of grass cover patterns on slope erosion and its morphological parameters, providing a scientific basis for the prevention and control of slope erosion on the Loess Plateau. [Methods] In this study, the effects of different grass cover patterns on rill morphology development on loess slopes were examined through artificial rainfall simulation, 3D laser scanning, and geographic information system (GIS) technology. Additionally, the effects of rainfall intensity, slope gradient, and grass cover patterns on rill morphological parameters were analyzed. [Results] (1) Grass cover patterns significantly inhibited both runoff and sediment yield on slopes, with its inhibitory effects on erosion rate being more pronounced than on runoff rate.(2) With increasing grass coverage, rill density, dissection index, and fractal dimension all decreased, while the width-todepth ratio first decreased and then increased, indicating a threshold affecting slope erosion within the 30%~40% coverage range.(3) The effect of grass coverage on rill erosion and morphological parameters was stronger than that of rainfall intensity and slope gradient. (4) The model incorporating rainfall intensity, slope, and grass coverage demonstrated the highest accuracy in simulating their effects on rill density, with a coefficient of determination (R2) of 0.684 and a Nash-Sutcliffe efficiency (NSE) of 0.646, indicating reliable prediction performance. [Conclusion] Grass cover can effectively reduce slope erosion severity and decrease the complexity and density of rill development. Among morphological parameters, rill density and dissection index serve as reliable indicators of rill erosion.

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Last Update: 2025-12-10