Movement of Water in Soil Due to a Temperature Gradient

Gurr, C. G.; Marshall, T. J.; Hutton, J. T.

doi:10.1097/00010694-195211000-00001

Cited by 157 publications

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“…This would be in addition to that which moves up as moisture and is lost to the atmosphere (9). The ability of a thermal gradient to indirectly cause the transfer of significant amounts of soluble salts from cool soil regions into warm regions has been well demonstrated (11). This type of transport may be much greater than the Soret type thermal salt diffusion mentioned previously.…”

Section: A Practical Example and Its Implicationsmentioning

confidence: 93%

Soil Moisture Transport Due to Thermal Gradients: Practical Aspects

Cary¹

1966

Soil Science Soc of Amer J

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The present status of knowledge concerning thermally induced transport of moisture in soil is reviewed. This includes the various theories on mechanisms of transport and experimental data showing the magnitude of moisture flow in various porous materials. Wherever possible these data were chosen to show the relative importance of thermal versus head‐type flow and some general trends are noted. Simple equations are developed to describe the thermally induced moisture flow near the soil surface which arises from transient thermal gradients produced by the diurnal temperature cycle. Calculations of the moisture flux over 2 ten‐hour time intervals for a typical field situation indicate that thermal water transport should be considered whenever moisture, salt, or heat fluxes are being studied in the soil's surface layers. The upward flow of soil water against a moisture content gradient in the winter is also considered. A sample calculation of the amount of thermally driven moisture was made using data available in the literature. The result suggested that the thermal moisture flow was too small to account for the net movement of soil moisture into the frost zone.

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Section: A Practical Example and Its Implicationsmentioning

confidence: 93%

Soil Moisture Transport Due to Thermal Gradients: Practical Aspects

Cary¹

1966

Soil Science Soc of Amer J

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“…2), the average ~noisture content in the test region is seen to be less than 2 per cent. Under the action of a temperature gradient, moisture moves from hot to cool regions (4,7,9). Thus the nloisture content at the cold side probably attained a value large enough to permit gravity drainage out of the test region, leaving an average moisture content in the test region of approximately 1.5 per cent.…”

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confidence: 99%

Heat and Moisture Transfer in Closed Systems of Two Granular Materials

Woodside

Cliffe

1959

Soil Science

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Science, 87, 2, pp. 75-82, 1959-04-01 Heat and moisture transfer in closed systems of two granular materials Woodside, W.; Cliffe, J. B.

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“…This relationship, depending on the initial water content, is consistent with the appearances of a pronounced moisture gradient and no increase in the LHT in soil when the initial water content is less than 0.2 m 3 m -3 , and with those of no moisture gradient and significant increase in the LHT in soil when the initial water content is greater than 0.3 m 3 m -3 , as observed by Sakaguchi et al (2009). Because the mechanism of the LHT in soil is the transfer of latent heat with the circulation of water (Gurr et al, 1952;Hadley and Eisenstadt, 1955) which consists of vapour flow towards the cooler side and counter-flow of liquid towards the hotter side in soil (Sakaguchi et al, 2009), the discrepancy that appeared between the product and the C (Fig. 1) should be relevant to an unidentified characteristic of the circulation of water in soil.…”

Section: Resultsmentioning

confidence: 86%

Issues of conventional model of transfer of latent heat in soil

Sakaguchi¹,

Mochizuki²,

Katayama³

et al. 2017

International Agrophysics

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A b s t r a c t. Upper limit of experimental coefficient between the measured transfer of latent heat and the estimated vapour flux in the frame of the conventional model of latent heat transfer in soil was examined by analysing the measured latent heat transfer and temperature gradient in soil under steady-state temperature gradient. To exclude the temperature gradient as an uncertainty factor from the experimental coefficient, the temperature gradients of overall soil and soil pore were included into the vapour fluxes in the atmosphere. The estimated experimental coefficient did not exceed unity, which indicated that both the latent heat transfer and the vapour fluxes in the soil were smaller than those in the atmosphere. The gap that appeared between the experimental coefficient and the product of the tortuosity factor and air-filled porosity implied the existence of an unidentified parameter relevant to characteristic of the circulation of water in soil which is the main mechanism of latent heat transfer in soil. By quantifying this characteristic with simultaneous measurements of the latent heat transfer, distributions of temperature, water content and solute content in various soils under the steady-state condition, the conventional model would be modified, or an alternative model being independent of the conventional model would be developed.

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Movement of Water in Soil Due to a Temperature Gradient

Cited by 157 publications

References 0 publications

Soil Moisture Transport Due to Thermal Gradients: Practical Aspects

Soil Moisture Transport Due to Thermal Gradients: Practical Aspects

Heat and Moisture Transfer in Closed Systems of Two Granular Materials

Issues of conventional model of transfer of latent heat in soil

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