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Unsaturated flow effects on solute transport in porous media

Zhuang, Luwen ; Raoof, Amir ; Mahmoodlu, Mojtaba G. ; Biekart, Sara ; de Witte, Riemer ; Badi, Lubna ; van Genuchten, Martinus Th ; Lin, Kairong

Journal of hydrology (Amsterdam), 2021-07, Vol.598, p.126301, Article 126301 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Unsaturated flow effects on solute transport in porous media
  • Autor: Zhuang, Luwen ; Raoof, Amir ; Mahmoodlu, Mojtaba G. ; Biekart, Sara ; de Witte, Riemer ; Badi, Lubna ; van Genuchten, Martinus Th ; Lin, Kairong
  • Assuntos: Dispersion ; Dispersivity ; Solute transport ; Unsaturated zone
  • É parte de: Journal of hydrology (Amsterdam), 2021-07, Vol.598, p.126301, Article 126301
  • Descrição: •Column experiments were carried out to explore the effects of saturation and particle size on the solute dispersivity.•A clear non-monotonic relationship was found between the dispersivity and soil water saturation.•The extent of non-monotonicity was more pronounced for relatively coarse-textured soils, but less for finer soils. A major contaminant transport process in soils is hydrodynamic dispersion by affecting the spreading and arrival of surface-applied pollutants at underlying groundwater reservoirs. When a soil is unsaturated, hydrodynamic dispersion is very much affected by soil water saturation. Centimeter- and decimeter-scale column experiments were carried out to explore the effects of fluid saturation and particle size on the unsaturated solute dispersivity. Measured in-situ breakthrough curves were analyzed in terms of both classical advection–dispersion and dual-porosity (mobile-immobile) type transport equations. A clear non-monotonic relationship was found between the dispersivity and soil water saturation. The extent of non-monotonicity was more pronounced for a relatively coarse-textured sand compared to a finer sand. This finding has been reported rarely before; it explains some of the inconsistencies of saturation-dispersivity relationships in the literature.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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