Flow-driven soil erosion processes in a calcareous semiarid soil: Rill length and flow rate impacts

Hussein, Maiss; Asadi, Hossein; Kouchakzadeh, S.; Mohammadi, Mohammad Hossein

doi:10.1016/j.catena.2022.106765

Cited by 3 publications

(1 citation statement)

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“…The process of sidewall expansive erosion in rills unfolds during the later stages of rill development, exhibiting a complex, variable, and unpredictable nature attributable to numerous factors including flow dynamics, slope gradients, soil attributes, and management practices [1][2][3][4][5][6][7]. As the developmental trajectory of erosion features, spanning from rills to river gullies, presents a cohesive continuum, the underlying principles governing the expansion of rill sidewalls remain consistent across these various scales, particularly evident in the erosive action of lateral water flow along the rill sidewalls, concentrated scouring at the rill base, mid-flow erosion within loamy substrates, internal soil pipeline erosion, and bank erosion triggered by soil stability-related avalanches [8][9][10][11][12][13][14]. Following the scouring action of concentrated water flow at the rill base, tension fissures are inclined to develop along the inner surface of the rill sidewall once the driving force, primarily exerted by soil gravity, surpasses the resistance arising from inter-particle bonding and friction [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Collapse Mechanism of Slope Rill Sidewall under Composite Erosion of Freeze-Thaw Cycles and Water

Huang,

Shao,

Liu

et al. 2024

Sustainability

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The composite erosion of freeze-thaw and water flow on slope rills is characterized by periodicity and spatial superposition. When revealing the collapse mechanism of slope rill sidewalls under the composite erosion of freeze-thaw and water flow, it is necessary to fully consider the effect of water migration and its impact on the stability of the rill sidewall. In this paper, we placed the self-developed collapse test system in an environmental chamber to carry out model tests on rill sidewall collapse on slopes under the composite erosion of freeze-thaw and water flow. We utilized three-dimensional reconstruction technology and the fixed grid coordinate method to reproduce the collapse process of the rill sidewall and precisely locate the top crack. We obtained the relationship between the water content of the specimen and mechanical indexes through the straight shear test. The main conclusions are as follows: The soil structure of the rill sidewall is significantly affected by the freeze-thaw cycle, which benefits capillary action in the soil. One freeze-thaw cycle has the most serious effect on the soil structure of the rill sidewall, and the change in the moisture field is more intense after the soil temperature drops below zero. The friction angle of the soil increases with the number of freeze-thaw cycles and tends to stabilize gradually. The effect of the freeze-thaw cycle on the rate of change of the water content of the soil at each position of the wall can be accurately described by a logarithmic function. The expression of the two-factor interaction effect on the rate of change of water content of soil at each position of the rill sidewall can be accurately fitted. We propose a calculation system for locating cracks at the top of the rill sidewall and determining the critical state of instability and collapse of the rill sidewall during the process of freeze-thaw and water flow composite erosion. The results of this research can help improve the accuracy of combined freeze-thaw and water flow erosion test equipment and the development of a prediction model for the collapse of the rill sidewall under compound erosion. This is of great significance for soil and water conservation and sustainability.

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