Morphological Characteristics and Cross-sectional Heterogeneity of Rill Erosion on Loess Slope

• Published in: Shui tu bao chi xue bao Vol. 39; no. 2; pp. 30 - 39
• Main Authors: LIU Qing, SHEN Donghui, HE Jijun, LIU Zhuangzhuang, SUN Liying, CAI Qiangguo
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Journal of Soil and Water Conservation 01.04.2025
• Subjects: rainfall intensity; rill cross section; rill erosion; rill morphological parameters
• DOI: 10.13870/j.cnki.stbcxb.2025.02.033
• ISSN: 1009-2242

［Objective］ To explore the variation patterns and cross-sectional distribution characteristics of rill erosion and its morphological features. ［Methods］ Indoor artificially simulated rainfall experiments and 3D laser scanning were conducted to analyze the distribution of runoff, sediment yield and rill morphological characteristics of rill erosion under different rainfall and slope conditions. ［Results］ 1) When the rainfall intensity increased, the runoff and sediment yield increased significantly. When the rainfall intensity was 90 mm/h, the contribution rate of rill erosion to total erosion could reach more than 90%. 2) Rill width, depth, width-to-depth ratio and rill splitting degree were significantly affected by rainfall intensity, and all showed varying degrees of increase. Rill splitting degree and the maximum depth of rill showed a significant positive correlation with the amount of rill erosion. 3) Rill cross section varied greatly along the slope direction, the collapse of the gully wall was obvious