An improved model based on lattice Boltzmann method for the simulation of water and salt migration in unsaturated soils

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-07-02 DOI:10.1016/j.jhydrol.2025.133801

Chao Shen , Guo Tian , Shen Wei , Dongwei Zhang , Ge Song

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引用次数: 0

Abstract

It is of significant scientific and engineering importance to investigate the fluid flow and mass transfer processes occurring in porous media. In this study, the lattice Boltzmann method (LBM)-based multiphase flow mass transport model is improved using the pseudo-potential model theory and the colour gradient model theory. The improved model is verified in terms of its ability to simulate coupled multiphase flow and mass transport processes and the optimisation of computational efficiency. The model is then employed to study the migration of water and salt in soil, and the results demonstrate that the transport of salt species is primarily influenced by the transport of water. Additionally, under isothermal conditions, there are minor fluctuations in the constant water content in the soil, which can be attributed to local evaporation and condensation processes driven by moisture gradients. Finally, the mechanism of local evaporation leading to local solute concentration was also subjected to investigation.

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基于格子玻尔兹曼法的非饱和土壤水盐迁移模拟改进模型

研究多孔介质中的流体流动和传质过程具有重要的科学和工程意义。本文利用拟势模型理论和颜色梯度模型理论对基于晶格玻尔兹曼方法的多相流质量输运模型进行了改进。改进后的模型在模拟多相流和质量输运耦合过程和优化计算效率方面得到了验证。利用该模型研究了水盐在土壤中的迁移，结果表明，盐种的迁移主要受水分迁移的影响。此外，在等温条件下，土壤中恒定含水量存在较小的波动，这可归因于水分梯度驱动的局部蒸发和凝结过程。最后，对局部蒸发导致局部溶质浓度的机理进行了探讨。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.