Numerical modeling of water–heat–vapor–salt transport in unsaturated soil under evaporation

Wen, Wei; Lai, Yuanming; You, Zhenyu

doi:10.1016/j.ijheatmasstransfer.2020.120114

Cited by 32 publications

(9 citation statements)

References 41 publications

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“…Available models of heat and moisture transfer in soil under freezing and thawing conditions take into account the moisture conductivity of soil [36][37][38][39]. An obligatory element of models of moisture transfer in freezing soil is taking into account cryosuction, i.e., capillary force associated with the presence of a phase transition [40][41][42], natural convection in water that fills soil pores [43], and vapor transfer in water-free soil pores and snow cover [44][45][46]. After all, it is important to account correctly for solar radiation, which depends on the location and state of the atmosphere [47,48].…”

Section: Introductionmentioning

confidence: 99%

Soil Temperature in Disturbed Ecosystems of Central Siberia: Remote Sensing Data and Numerical Simulation

Ponomareva

Litvintsev

Finnikov

et al. 2021

Forests

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We investigated changes in the temperature regime of post-fire and post-technogenic cryogenic soils of Central Siberia using remote sensing data and results of numerical simulation. We have selected the time series of satellite data for two variants of plots with disturbed vegetation and on-ground cover: natural ecosystems of post-fire plots and post-technogenic plots with reclamation as well as dumps without reclamation. Surface thermal anomalies and temperature in soil horizons were evaluated from remote data and numerical simulation and compared with summarized experimental data. We estimated the influence of soil profile disturbances on the temperature anomalies forming on the surface and in soil horizons based on the results of heat transfer modeling in the soil profile. According to remote sensing data, within 20 years, the thermal insulation properties of the vegetation cover restore in the post-fire areas, and the relative temperature anomaly reaches the level of background values. In post-technogenic plots, conditions are more “contrast” comparing to the background, and the process of the thermal regime restoration takes a longer time (>60 years). Forming “neo-technogenic ecosystems” are distinct in special thermal regimes of soils that differ from the background ones both in reclamated and in non-reclamated plots. An assumption was made of the changes in the moisture content regime as the main factor causing the long-term existence of thermal anomalies in the upper soil horizons of disturbed plots. In addition, we discussed the formation of transition zones (“ecotones”) along the periphery of the disturbed plots due to horizontal heat transfer.

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Section: Introductionmentioning

confidence: 99%

Soil Temperature in Disturbed Ecosystems of Central Siberia: Remote Sensing Data and Numerical Simulation

Ponomareva

Litvintsev

Finnikov

et al. 2021

Forests

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“…The movement of soil water is responsible for the migration of salt, and thus the spatial distribution of water primarily determines that of salt. However, the relative humidity of the pores decreases as the salt dissolves in liquid water and the pore volume is reduced, which thereby affects the transport of soil water and even its distribution [14]. Wen et al [14] verified the existence of water-salt coupling based on a model developed based on film water transport theory, which considered the influence of salt on surface tension as well as the filling effect of precipitated salt on the soil pores, residual volumetric air content, the effect of salt on heat transport and storage, and the influences of vapor flux and thermal radiation on the thermal boundary.…”

Section: Correlations Between the Spatial Variability Of Soil Water A...mentioning

confidence: 99%

“…However, the relative humidity of the pores decreases as the salt dissolves in liquid water and the pore volume is reduced, which thereby affects the transport of soil water and even its distribution [14]. Wen et al [14] verified the existence of water-salt coupling based on a model developed based on film water transport theory, which considered the influence of salt on surface tension as well as the filling effect of precipitated salt on the soil pores, residual volumetric air content, the effect of salt on heat transport and storage, and the influences of vapor flux and thermal radiation on the thermal boundary. Li et al [49] also proposed a new uncertainty simulation optimization framework for the distribution of irrigation water distribution based on the physical water-salt coupling process, where this framework focused on the effects of soil water and salt migration on the distribution of irrigation water in the field.…”

Section: Correlations Between the Spatial Variability Of Soil Water A...mentioning

confidence: 99%

“…The soil water carries salt, which facilitates its migration, and thus the spatial distribution of water determines the spatial distribution of salt to a great extent [12,13]. However, the relative humidity in soil pores decreases as the salt dissolves in liquid water, and the reduced pore volume affects the transport of soil water [14]. Therefore, it is assumed that the spatial distribution of soil water and salt will be correlated because of their coupling.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Distribution of Soil Water and Salt in a Slightly Salinized Farmland

Liu

et al. 2023

Sustainability

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It is important to study the mechanisms associated with the spatial distribution of soil water and salt to control soil salinization and promote the sustainable development of farmland. Six plots in a slight farmland with different spatial locations were selected to determine the spatial distribution of soil water and salt and their correlation using the multifractal method. Each plot was applied using the grid method (15 m × 15 m, 3600 m2), where each sampling site was located at the center point coordinates. The 0–20 and 20–40 cm soil layers were sampled.The spatial variability of the soil water and salt were 1.41 and 1.73 fold higher in the upstream farmland than in the downstream farmland. The spatial variability of the soil water and salt was significantly correlated. In addition, the spatial variability of the soil water and salt significantly correlated in the 0–20 and 20–40 cm layers. The spatial distribution of both soil water and salt in the entire soil layer had similar characteristics at this sampling scale. Our results provide a theoretical basis to study the interactive mechanisms associated with the distribution of soil water and salt.

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“…Soil water plays a crucial role in the transport of salt, as the leaching and accumulation of soil salt depend on the presence of water [9,10]. When salt dissolves in liquid water, the relative humidity of pores decreases and the volume of pores also decreases, impacting soil water transport [11]. Walter et al [12] showed that a close correlation is observed between soil water and salt.…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution Mechanism of Soil Water-Salt Coupling Effect in Arid Saline-Alkali Farmland

Ke,

Ma,

Shen

2024

Preprint

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Revealing the spatial distribution mechanism of the coupling effect between soil water and salt is essential for managing saline-alkali farmland. This study utilized the multifractal method to analyze soil water and salt under varying water content levels in arid saline-alkali farmland. Soil samples were collected on the second (S1), fifth (S2), eighth (S3), eleventh (S4), and fourteenth (S5) days after a rainfall event. The findings showed that a significant decrease in soil water content, contrasting with an increase in soil salt content throughout the soil layers post-rainfall. As water content decreased, the spatial variability of soil water initially increased from S1-3 and then decreased, while the spatial variability of soil salt decreased. The spatial distribution between soil water and salt exhibited a high correlation at S3-4 (with relative water content of soil ranging from 0.52 to 0.75) due to their coupling effect. However, soil salt was unevenly leached by rainfall at high water content levels (S1-2) and precipitated at low water content levels (S5), resulting in low spatial variability correlations between soil water and salt. This study elucidated the coupling process of soil water and salt, identifying their spatiotemporal distribution mechanism in dryland agricultural areas.

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Numerical modeling of water–heat–vapor–salt transport in unsaturated soil under evaporation

Cited by 32 publications

References 41 publications

Soil Temperature in Disturbed Ecosystems of Central Siberia: Remote Sensing Data and Numerical Simulation

Soil Temperature in Disturbed Ecosystems of Central Siberia: Remote Sensing Data and Numerical Simulation

Spatial Distribution of Soil Water and Salt in a Slightly Salinized Farmland

Spatial Distribution Mechanism of Soil Water-Salt Coupling Effect in Arid Saline-Alkali Farmland

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