Soil erosion characteristics and hydrodynamic mechanisms in the Southern Jiangsu Hilly Region under simulated rainfall conditions

WANG Wenjing, YANG Rui, HU Haibo, ZHU Li, WU You, GUO Shaojun

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0 DOI: 10.12302/j.issn.1000-2006.202604014

Soil erosion characteristics and hydrodynamic mechanisms in the Southern Jiangsu Hilly Region under simulated rainfall conditions

  • WANG Wenjing1, YANG Rui2, HU Haibo1,3,*, ZHU Li4, WU You1, GUO Shaojun1
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Abstract

【Objective】 By investigating the runoff and sediment yield processes and the hydrodynamic mechanisms of surface runoff on two typical soil slopes in the economic forest area of the Southern Jiangsu Hilly Region, this study aimed to reveal the characteristics of soil erosion and the patterns underlying its formation, thereby providing a theoretical reference for soil erosion control, vegetation restoration, and the sustainable development of natural resources and the environment in this region. 【Methods】 Through simulated rainfall experiments, real-time monitoring of runoff and sediment yield was conducted on slopes with two typical soil types (yellow-brown soil and red soil) in the hilly region of Southern Jiangsu under varying rainfall intensities (20, 40, 60, and 80 mm/h) and slope gradients (10°, 20°, and 30°). The hydrodynamic characteristics of slope runoff were elucidated, and the mechanisms of soil erosion on these slopes were revealed. 【Results】 (1) Initial runoff occurred earlier on yellow-brown soil slopes than on red soil slopes. The time to initial runoff decreased with increasing rainfall intensity and slope gradient, and the higher the rainfall intensity, the smaller the influence of slope gradient. Both runoff and sediment yield were higher on yellow-brown soil slopes than on red soil slopes. (2) Flow velocity on both slope types stabilized within 2-10 minutes; the higher the rainfall intensity, the shorter the time required for flow velocity to stabilize. The correlations of runoff and soil erosion with hydrodynamic parameters were similar for both slope types. The order of significant positive correlations was: runoff depth > Reynolds number > runoff shear stress > average slope flow velocity > runoff power. No significant correlation was found with the drag coefficient, and runoff depth showed the best fit with soil erosion for both slope types. 【Conclusion】 Soil erosion on yellow-brown soil slopes in the Southern Jiangsu Hilly Region was greater than that on red soil slopes. Runoff depth and the Reynolds number exhibited the most significant correlations with slope erosion, and runoff depth was a better predictor of soil erosion on both slope types in the study area.

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soil erosion / Southern Jiangsu hilly region / rainfall intensity / slope / hydrodynamic characteristics

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WANG Wenjing, YANG Rui, HU Haibo, ZHU Li, WU You, GUO Shaojun. Soil erosion characteristics and hydrodynamic mechanisms in the Southern Jiangsu Hilly Region under simulated rainfall conditions[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 0 https://doi.org/10.12302/j.issn.1000-2006.202604014

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