Simultaneous Transfer of Heat, Water, and Solute in Porous Media: I. Theoretical Development

Nassar, I. N.; Horton, Robert

doi:10.2136/sssaj1992.03615995005600050004x

Cited by 94 publications

(39 citation statements)

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“…However, such modifications have not yielded satisfactory agreement between PDV model predictions and field data [17,11], while laboratory column studies have provided only limited support of the PDV theory [70]. Greater success was achieved with the modified PDV based water and heat transport model of Nassar and Horton [47] which was adapted to include osmotic pressure effects. A coupled water and heat transport model based on the PDV theory adapted to include osmotic pressure effects and interfaced with a solute transport model was developed by Nassar and Horton [47].…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal soil water transport and evaporation

Grifoll

Gastó

Cohen

2005

Advances in Water Resources

102

100

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Section: Introductionmentioning

confidence: 99%

Non-isothermal soil water transport and evaporation

Grifoll

Gastó

Cohen

2005

Advances in Water Resources

102

100

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“…Milly (1984) [4] adopted the matric head instead of the total volumetric water content in the PDV model. Nassar and Horton (1989) [5] further extended Milly's work by including osmotic effects on liquid and water vapor movement. Sakai et al (2009) [6] presented a coupled model for water and vapor movement which considers condensation and evaporation effects under nonisothermal and low water content conditions.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The governing equation can thus be expressed as: [7] ). Considering vaporization and condensation processes in unsaturated soil, the governing equation of heat conservation is given as (de Veries, 1958 [8] ; Nassar and Horton, 1992 [5] ):…”

Section: Mathematical Modelmentioning

confidence: 99%

A New Mechanism of Canopy Effect in Unsaturated Freezing Soils

Teng

Zhang

et al. 2016

E3S Web Conf.

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Abstract. Canopy effect refers to the phenomenon where moisture accumulates underneath an impervious cover. Field observation reveals that canopy effect can take place in relatively dry soils where the groundwater table is deep and can lead to full saturation of the soil immediately underneath the impervious cover. On the other hand, numerical analysis based on existing theories of heat and mass transfer in unsaturated soils can only reproduce a minor amount of moisture accumulation due to an impervious cover, particularly when the groundwater table is relatively deep. In attempt to explain the observed canopy effect in field, this paper proposes a new mechanism of moisture accumulation in unsaturated freezing soils: vapour transfer in such a soil is accelerated by the process of vapour-ice desublimation. A new approach for modelling moisture and heat movements is proposed, in which the phase change of evaporation, condensation and de-sublimation of vapor flow are taken into account. The computed results show that the proposed model can indeed reproduce the unusual moisture accumulation observed in relatively dry soils. The results also demonstrate that soil freezing fed by vapour transfer can result in a water content close to full saturation. Since vapour transfer is seldom considered in geotechnical design, the canopy effect deserves more attention during construction and earth works in cold and arid regions.

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“…The isothermal, K vh and thermal, K vT , vapor hydraulic conductivities are described by Nassar and Horton [38]. Equation (3) is solved numerically using the hydrological simulator HYDRUS-1D [32].…”

Section: Hydrodynamic Modelingmentioning

confidence: 99%

Experimental Measurement of Diffusive Extinction Depth and Soil Moisture Gradients in a Dune Sand Aquifer in Western Saudi Arabia: Assessment of Evaporation Loss for Design of an MAR System

Mughal

Jadoon

Martin

et al. 2015

Water

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A component of designing a managed aquifer recharge system in a dune aquifer is the control of diffusive evaporative loss of water which is governed by the physical properties of the sediments and the position of the water table. A critical water table position is the "extinction depth", below which no further loss of water occurs via diffusion. Field experiments were conducted to measure the extinction depth of sediments taken from a typical dune field in the region. The soil grain size characteristics, laboratory porosity, and saturated hydraulic conductivity were measured. The sand is classified as well-sorted, very fine sand with a mean grain diameter of 0.15 mm. Soil moisture gradients and diffusion loss rates were measured using sensors in a non-weighing lysimeter that was placed below land surface. The sand was saturated carefully with water from the bottom to the top and was exposed to the natural climate for a period of about two months. The moisture gradient showed a gradual decline during measurement until extinction depth was reached at about 100 cm below surface after 56 days. Diurnal temperature changes were observed in the upper 75 cm of the column and were negligible at greater depth.

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Simultaneous Transfer of Heat, Water, and Solute in Porous Media: I. Theoretical Development

Cited by 94 publications

References 0 publications

Non-isothermal soil water transport and evaporation

Non-isothermal soil water transport and evaporation

A New Mechanism of Canopy Effect in Unsaturated Freezing Soils

Experimental Measurement of Diffusive Extinction Depth and Soil Moisture Gradients in a Dune Sand Aquifer in Western Saudi Arabia: Assessment of Evaporation Loss for Design of an MAR System

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