Three-Porosity Model for Predicting the Gas Diffusion Coefficient in Undisturbed Soil

2004 ◽  
Vol 68 (3) ◽  
pp. 750-759 ◽  
Author(s):  
Per Moldrup ◽  
Torben Olesen ◽  
Seiko Yoshikawa ◽  
Toshiko Komatsu ◽  
Dennis E. Rolston
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion ◽  
Undisturbed Soil ◽  
Porosity Model

Three-Porosity Model for Predicting the Gas Diffusion Coefficient in Undisturbed Soil

2004 ◽  
Vol 68 (3) ◽  
pp. 750 ◽  
Author(s):  
Per Moldrup ◽  
Torben Olesen ◽  
Seiko Yoshikawa ◽  
Toshiko Komatsu ◽  
Dennis E. Rolston
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion ◽  
Undisturbed Soil ◽  
Porosity Model

EXPERIMENTS ON THE AIR PERMEABILITY OF FOREST SOILS BY RADIUM-EMANATION METHOD

1966 ◽  
Vol 3 (4) ◽  
pp. 419-429
Author(s):  
J. Imre
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion ◽  
Soil Conditions ◽  
Alkaline Soil ◽  
Undisturbed Soil ◽  
Radium Emanation ◽  
Colloidal Properties ◽  
Different Depths ◽  
Emanation Method ◽  
D Values

A radium-emanation method was developed for measuring the gas diffusion coefficient D in soils of differing structure and colloidal properties. The method was quick and simple, and could be carried out under natural, undisturbed soil conditions. Diffusion coefficients varied from 200 cm2/hour in coarse-textured soil to less than 5 cm2/hour in moderately fine-textured alkaline soil. The permeability was reduced by an increase in soil moisture, clay, and alkali content in the profile. When these factors varied with depth, the diffusion coefficient was not constant and the theoretical conditions of the method were not satisfied. Useful estimates were possible, however, when the apparent D values obtained at different depths were compared with other soil properties.

scholarly journals The influence of soil structure and air content on gas diffusion in soils.

1970 ◽  
Vol 18 (1) ◽  
pp. 37-48
Author(s):  
J.W. Bakker ◽  
A.P. Hidding
Keyword(s):  
Diffusion Coefficient ◽  
Soil Structure ◽  
Soil Surface ◽  
Ambient Air ◽  
Gas Diffusion ◽  
Undisturbed Soil ◽  
Air Content ◽  
Temperature And Pressure ◽  
Storage Term ◽  
Puddled Soil

A method is described of determining the diffusion coefficient of O2 in undisturbed soil samples. Calculations were made of errors involved when neglecting the storage term, temperature and pressure variations, O2 consumption and resistance of ambient air. The diffusion coefficient (Ds) is a function of air porosity (eg) and soil structure. At values of eg below 0.2, the effect of a puddled soil surface becomes evident. In puddled soils values of Ds at equal eg are far below those in non-puddled soils and the differences increase with decreasing eg. A wet soil crust can severely limit gas exchange by diffusion. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Predicting the Gas Diffusion Coefficient in Undisturbed Soil from Soil Water Characteristics

2000 ◽  
Vol 64 (1) ◽  
pp. 94-100 ◽  
Author(s):  
P. Moldrup ◽  
T. Olesen ◽  
P. Schjønning ◽  
T. Yamaguchi ◽  
D. E. Rolston
Keyword(s):  
Diffusion Coefficient ◽  
Soil Water ◽  
Gas Diffusion ◽  
Undisturbed Soil ◽  
Water Characteristics

Assessment of the soil CO2gradient method for soil CO2efflux measurements: comparison of six models in the calculation of the relative gas diffusion coefficient

Tellus B ◽  
2010 ◽  
Vol 62 (1) ◽  
Author(s):  
Natchaya Pingintha ◽  
Monique Y. Leclerc ◽  
John P. Beasley ◽  
Gengsheng Zhang ◽  
Chuckree Senthong
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion

Experimental and numerical analyses of apparent gas diffusion coefficient in gas shales

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 116123 ◽  
Author(s):  
Ying Zhong ◽  
Jiping She ◽  
Hao Zhang ◽  
Ergun Kuru ◽  
Bin Yang ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion ◽  
Numerical Analyses ◽  
Gas Shales

Transient holographic measurement of the gas diffusion coefficient in water

1997 ◽  
Vol 29 (2) ◽  
pp. 149-154 ◽  
Author(s):  
Wilfried Roetzel ◽  
Detlef Blömker ◽  
Walter Czarnetzki
Keyword(s):  
Diffusion Coefficient ◽  
Gas Diffusion ◽  
Holographic Measurement
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