Abstract
Elucidating the mechanical mechanisms of linear erosion can contribute to the understanding of soil erosion and its prevention. However, few studies have investigated the development of sediment yield and the mechanical understanding of linear erosion. Experiments, four flow discharge rates and three slope gradients, were conducted for a mechanistic understanding of linear erosion. The conclusions are as follows: (1) The forces that detach soil can be divided into dynamic force (DF) and resistance force (RF) by vector decomposition and synthesis methods. The difference between DF and RF is defined as the effective force (EF), which represents the comprehensive mechanical effect of soil erosion. (2) DF and RF tend to be balanced during linear erosion. EF significantly decreased (p < 0.05), DF decreased, and RF increased. (3) The erosion rate (Er) decreases noticeably with decreasing EF (p < 0.05), from 3.99 kg/min to 2.99 kg/min when the slope is 15° and the discharge is 25 L/min. (4) The tendency for mechanical balance is attributed to the interaction among the flow dynamics, resistance, and morphology of linear erosion. The drop-pits and microgeomorphology developed in the linear erosion increased the water flow resistance and decreased the flow dynamics. This mechanical tendency provides a theoretical basis for linear erosion prevention. Our results can help improve the understanding of soil erosion mechanisms and management of water and soil resources.
Published Version
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