Relationship between soil erodibility by concentrated flow and shear strength of a Haplic Acrisol with a cationic polyelectrolyte

Yamaguchi, Atsushi; Kanashiki, Naho; Ishizaki, Hiromasa; Kobayashi, Motoyoshi; Osawa, Kazutoshi

doi:10.1016/j.catena.2022.106506

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…Soil erosion reduction is mainly controlled by soil properties and can be quantitatively reflected by different parameters (soil texture, structure, aggregate, shear strength, and organic colloids) from different approaches (Gyamfi et al, 2016; Lee et al, 2022; Yamaguchi et al, 2022). Normally, finer particles, more colloidal materials, and higher aggregate content result in stronger soil erosion reduction (Wang et al, 2019a).…”

Section: Discussionmentioning

confidence: 99%

Effects of vegetation restoration types on soil erosion reduction of a shallow karst fissure soil system in the degraded karst areas of Southwestern China

et al. 2023

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Shallow karst fissures are the main hydrological paths, underground loss channels, and one of the most critical root habitats in fragile karst rocky desertification areas. Revegetation may alter the type of vegetation cover in fissures, resulting in changes to soil properties and erosion reduction. In this study, we evaluate the influence of revegetation on the soil erosion reduction of fissure‐soil–plant systems (FSPS) for three vegetation types (herbs, shrubs, and trees) in FSPS and use bare FSPS without vegetation as a control in a karst rocky desertification area. The results show that the soil physicochemical properties of FSFS degraded first and then improved after abandonment, resulting in the order of soil erosion reduction of FSPS with vegetation succession being: shrub < herb < bare < tree. Vegetation restoration can significantly improve the soil erosion resistance of the 10–20 cm soil layer in the fissure zone, making it stronger than that in the non‐fissure zone, thus reducing the risk of underground leakage on the slope. The results obtained in this study deepen our knowledge of the impact of vegetation restoration type on soil erosion reduction and has significant implications for guiding vegetation restoration and preventing underground leakage in karst areas.

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Section: Discussionmentioning

confidence: 99%

Effects of vegetation restoration types on soil erosion reduction of a shallow karst fissure soil system in the degraded karst areas of Southwestern China

et al. 2023

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“…Applications for this affinity range from stabilizing or destabilizing suspended particles or colloids to constructing ultrathin films via the layer-by-layer assembly process. , Large quantities of polyelectrolytes are used as flocculants for treating types of suspensions in water treatment, in papermaking, in biotechnology, and for mineral processing . Particle bridging by polyelectrolytes enables their use in soil stabilization. , …”

Section: Introductionmentioning

confidence: 99%

“…5 Particle bridging by polyelectrolytes enables their use in soil stabilization. 6,7 Surfaces in the environment are often oxides, which means that the state of the surface charge is a strong function of pH and other factors. Research on the vast number of possible surface/polyelectrolyte combinations includes a focus on the ionic strength (i.e., salt concentration) of the aqueous media in which the surface is immersed.…”

Section: ■ Introductionmentioning

confidence: 99%

Relative Strength of Polycation Adsorption on Oxide Surfaces

Akintola,

Abou Shaheen,

et al. 2024

Langmuir

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Polyelectrolyte adsorption onto surfaces is widely employed in water treatment and mining. However, little is known of the relative interaction strengths between surfaces and polymer. This fundamental property is assumed to be dominated by electrostatics, i.e., attractive interactions between opposite charges, which are set by the overall ionic strength ("salt concentration") of the solution, and charge densities of the surface and the polymer. A common, counterintuitive finding is a range of salt concentrations over which the amount of adsorbed polyelectrolyte increases as electrostatic interactions are tempered by the addition of salt. After an adsorption maximum, higher salt concentrations then produce the expected gradual desorption of polyelectrolyte. In this work, the salt response of the adsorption of the same narrow molecular weight distribution polycation, poly(N-methyl-4-vinylpyridinium), PM4VP, to a variety of surfaces was explored. Oxide powders for adsorption included Al 2 O 3 , SiO 2 , Fe 2 O 3 , Fe 3 O 4 , TiO 2 , ZnO, and CuO. Planar surfaces included silicon wafers, mica, calcium carbonate, and CaF 2 single crystals. The PM4VP was radiolabeled with 14 C so that sensitive, submonolayer amounts could be detected. The position of the peak maximum, or the lack of a peak, in response to added salt was used to rank the electrostatic component of the interaction. The importance of charge regulation, a shift in the surface pK a in response to solution species, was highlighted as a mechanism for adsorption on the "wrong" side of the isoelectric point and also as a factor contributing to the difficulty of reaching the totally desorbed state even at the highest salt concentrations.

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“…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]. Subsequent to further scouring by concentrated flow at the rill base, the accumulation of overhanging soils escalates, initiating random collapses along the rill walls, thereby augmenting rill width and intensifying sidewall erosion rates, especially in response to slope gradients and the confluence of upstream flows [20][21][22][23][24][25].…”

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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Relationship between soil erodibility by concentrated flow and shear strength of a Haplic Acrisol with a cationic polyelectrolyte

Cited by 10 publications

References 43 publications

Effects of vegetation restoration types on soil erosion reduction of a shallow karst fissure soil system in the degraded karst areas of Southwestern China

Effects of vegetation restoration types on soil erosion reduction of a shallow karst fissure soil system in the degraded karst areas of Southwestern China

Relative Strength of Polycation Adsorption on Oxide Surfaces

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

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