Effects of DLVO, hydration and osmotic forces among soil particles on water infiltration

Luo, Yaxue; Li, H.; Ding, Wuquan; Hu, Feinan; Li, S.

doi:10.1111/ejss.12672

Cited by 19 publications

(9 citation statements)

References 27 publications

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“…In the present study, these hydration forces were selected because mica is one of the layer silicate minerals in soils and is independent of the electrolyte concentration (Israelachvili & Adams, 1978). The Hamaker constant A of soil particles is selected as 7.8 × 10 −20 J (Luo, Li, Ding, Hu, & Li, 2018b). Therefore, the net pressure, P net (the sum of P EDL , P hydr and P vdW ), can be estimated by Equation (34) and the results are shown in Figure 4.…”

Section: Interactions Between Soil Particles In Single Na + and Ca mentioning

confidence: 99%

Effects of interactions between soil particles and electrolytes on saturated hydraulic conductivity

Liu

Yang

et al. 2019

European J Soil Science

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Interactions between soil particles can strongly affect water movement in soil. In this study, a model to predict soil saturated hydraulic conductivity based on interactions between soil particles was proposed. Firstly, a model of ion−soil particle interactions at the soil/water interface was established taking specific ion effects into account. Based on the ion–soil interaction model, the theoretical relationship between the sodium adsorption ratio and the surface potential was derived, and the surface potentials were calculated at different sodium adsorption ratios and electrolyte concentrations. Secondly, a theoretical expression of midpoint potential between two adjacent soil particles in a mixed 1:1 + 2:1 electrolyte solution (e.g., NaCl + CaCl2) was derived. The midpoint potential was estimated based on the calculated surface potential. Thirdly, the interaction pressure (repulsive pressure) between soil particles was quantified based on the obtained midpoint potential. Finally, an empirical model of the relationship between measured saturated hydraulic conductivity and maximum net repulsive pressure was proposed. The surface potential, electrostatic repulsive pressure and net pressure between soil particles in the presence of Na+ is higher than that of Ca2+ because the effective charge of the former (1.18) is smaller than that of the latter (1.98). Although the soil saturated hydraulic conductivities were substantially different in Na+ and Ca2+ solutions, they can be described as a function of maximum repulsive pressure between soil particles. Employing this empirical relationship, saturated hydraulic conductivities might be predicted in other soils at different sodium adsorption ratios. This work implies that the sodium adsorption ratio and electrolyte concentration control saturated hydraulic conductivity through affecting the electrostatic repulsive pressure between soil particles. Highlights A model of ion–soil particle interactions was established considering specific ion effects. The theoretical relationship between sodium adsorption ratio and surface potential was derived. The interaction pressure between soil particles in mixed electrolytes was quantified. An empirical model of the relationship between saturated hydraulic conductivity and net repulsive pressure was proposed.

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Section: Interactions Between Soil Particles In Single Na + and Ca mentioning

confidence: 99%

Effects of interactions between soil particles and electrolytes on saturated hydraulic conductivity

Liu

Yang

et al. 2019

European J Soil Science

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“…The texture of the loessial soil is loam with large number of medium and small soil pores, which would help water infiltration, whereas it would be bad for soil water holding capacity (Wu et al 2015;Dong et al 2018). Soil water conductivity increased with the increase of soil water potential, which eventually led to an increase in the soil water infiltration rate (Stewart et al 2013;Luo et al 2018). Due to the difference of water content between upper and lower soil layers, the rainwater would infiltrate continuously with the gradients of Temporal and spatial changes of soil water content in each treatment under rainfall of 100 mm.…”

Section: Discussionmentioning

confidence: 99%

Fish-Scale Pits with Diversion Holes Enhance Water Conservation in Semi-arid Loess Soil: Experiments with Soil Columns, Mulching, and Simulated Rainfall

Zheng

Wang

et al. 2019

J Soil Sci Plant Nutr

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Fish-scale pits, as one of the most important ecological engineering in semi-arid areas, especially in the Loess Plateau, China, effectively reduced water and soil loss by intercepting runoff. However, the water saved by the pits is mainly accumulated in the upper soil layer and thus easily loosed by ineffective evaporation. In this study, soil column simulation experiments were conducted to observe the effects of diversion holes on soil evaporation and soil water distribution in the loessial soil under two rainfall depths and different soil surface treatments. The soil samples were passed through a 2-mm sieve. The soil filling height and the soil volume was 140 cm and 54,652.17 cm 3 in each soil column, respectively. For each treatment, there were three replicates. The results showed that gravel-mulching (GM), straw-mulching (SM), and diversion hole (DH) significantly decreased soil water evaporation compared with non-mulching (CK) under the different rainfall depths (P < 0.05). Under rainfall of 100 mm, the DH, GM, and SM caused an increase in the soil water content (SWC) in the 80-120 cm layer by 101.0%, 23.6%, and 65.5%, respectively. Under rainfall of 30 mm, CK increased SWC in the 0-40 cm layer, both GM and SM increased the SWC in the 0-60 cm layer, and the DH treatment allowed an increase in the 0-120 cm layer. Our results suggest that DH was a better measure to reduce soil evaporation and improve rainfall resource utilization, especially under high rainfall events. Our research provides scientific basis for the technology of soil deep spatiotemporal control and is of great significance to the balance and restoration of the ecological environment in the semi-arid Loess Plateau.

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“…It could be seen from Figure 4 that the electrostatic repulsive force between two fixed ore particles was negatively correlated to the (NH 4 ) 2 SO 4 solution concentration between 0.04 and 0.16 mol•L −1 but was positively correlated from 0.16 to 0.28 mol•L −1 . For the electrostatic repulsive force between two fixed ore particles, the main influencing factors included solution concentration and thickness of double electric layer on particle surface [25].…”

Section: Calculation Of Electrostatic Repulsive Force Between Orementioning

confidence: 99%

Effects of Concentration of Pore Solution on Stability of Ion‐Absorbed Rare Earth Ore Aggregate

Wang

Hong

2021

Advances in Civil Engineering

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The continuous change in solution concentration in ore pores during in situ mineral leaching influences the stability of ore aggregate. In this study, influences of the concentration of ammonium sulfate ((NH4)2SO4) solution on the interaction forces between ore particles were calculated. On this basis, the mechanism by which (NH4)2SO4 solution concentration influences the stability of ore aggregate was analyzed. Furthermore, an empirical formula for estimating the critical (NH4)2SO4 solution concentration for aggregation and dispersion of ore body aggregates with different grain composition was proposed. Some major conclusions were drawn. First, for ore bodies with an initial particle size of less than 0.075 mm, the interaction force between particles was net attraction, with the distance range of this force increasing as the concentration of (NH4)2SO4 solution increased from ≤0.001 to 0.16 mol·L−1, aggregation of ore particles occurring within this distance range. Secondly, for ore bodies with initial particle size of less than 0.075 mm, the interaction force between particles was net attraction, but with the distance range of this force decreasing when the (NH4)2SO4 solution concentration increased from 0.16 to 0.28 mol·L−1, dispersion of ore particles occurring beyond this distance range. Thirdly, for ore bodies with particle sizes of less than 0.038, 0.075 and 0.1 mm, the cation exchange capacity (CEC) was 9.13, 8.96, and 8.8 cmol·kg−1, respectively, and the critical (NH4)2SO4 solution concentration affecting the aggregation and dispersion of ore bodies was 0.12, 0.16, and 0.20 mol·L−1, respectively.

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Effects of DLVO, hydration and osmotic forces among soil particles on water infiltration

Cited by 19 publications

References 27 publications

Effects of interactions between soil particles and electrolytes on saturated hydraulic conductivity

Effects of interactions between soil particles and electrolytes on saturated hydraulic conductivity

Fish-Scale Pits with Diversion Holes Enhance Water Conservation in Semi-arid Loess Soil: Experiments with Soil Columns, Mulching, and Simulated Rainfall

Effects of Concentration of Pore Solution on Stability of Ion‐Absorbed Rare Earth Ore Aggregate

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