Effects of Continuous Rainfall and Runoff under Different Slope Conditions on Hillslope Soil Erosion in the Black Soil Region

• Published in: Shui tu bao chi xue bao Vol. 39; no. 2; pp. 12 - 20
• Main Authors: WANG Tingting, SHEN Haiou, LIANG Yushi, LIU Jianxiang, ZHAO Qiang, WANG Xueying, TIAN Li
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Journal of Soil and Water Conservation 01.04.2025
• Subjects: black soil region; inflow; rainfall; rill erosion; slope gradient
• ISSN: 1009-2242
• DOI: 10.13870/j.cnki.stbcxb.2025.02.016

［Objective］ To investigate the characteristics of rill erosion on slopes under different slope gradients and rainfall-runoff conditions. ［Methods］ Continuous simulated rainfall and upper slope inflow tests were conducted to study the erosion processes on slopes with two slope gradients (5° and 10°) and across three rainfall-runoff stages (rainfall, inflow, and rainfall+inflow). ［Results］ The volumes of slope runoff and erosion increased with slope gradient. Under rainfall conditions at a 5° slope, the runoff and erosion volumes were 1.06 and 2.23 times of those under inflow conditions, respectively, while at a 10° slope, the runoff and erosion volumes were 1.26 and 3.34 times of those under inflow conditions. The runoff rate initially increased over time and then tended to stabilize. The initial runoff production time occurred earlier with increasing rainfall frequency and slope gradient, with both the stable runoff rate and sediment yield rate increasing correspondingly. Under the same slope gradient, the co