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Influence of antecedent moisture content on residual LNAPL Saturation
In a water wet porous medium, the antecedent moisture content controls the entrapment of LNAPL at low capillary numbers. A two‐phase retention cell study of entrapment was conducted for LNAPL water systems in a carbonate sand. For two different LNAPL water systems, it was found that a linear expression related the residual LNAPL saturation to the antecedent water saturation. The prediction of trapped LNAPL saturation compares favorably to long‐column test data obtained for the same sand. A trapping model was developed, and its predictions were compared to field measurements of trapped LNAPL saturation. Deviations between predicted and measured LNAPL saturations arose when there was a change in the median pore size distribution. In addition, a series of three‐phase (air‐LNAPL‐water) retention cell tests measured the amount of LNAPL that became trapped when the water phase was maintained at a constant saturation during LNAPL withdrawal under a negative pressure head. Under these conditions, the amount of trapped LNAPL was higher than that measured by two‐phase tests at the same water saturation.
Influence of antecedent moisture content on residual LNAPL Saturation
In a water wet porous medium, the antecedent moisture content controls the entrapment of LNAPL at low capillary numbers. A two‐phase retention cell study of entrapment was conducted for LNAPL water systems in a carbonate sand. For two different LNAPL water systems, it was found that a linear expression related the residual LNAPL saturation to the antecedent water saturation. The prediction of trapped LNAPL saturation compares favorably to long‐column test data obtained for the same sand. A trapping model was developed, and its predictions were compared to field measurements of trapped LNAPL saturation. Deviations between predicted and measured LNAPL saturations arose when there was a change in the median pore size distribution. In addition, a series of three‐phase (air‐LNAPL‐water) retention cell tests measured the amount of LNAPL that became trapped when the water phase was maintained at a constant saturation during LNAPL withdrawal under a negative pressure head. Under these conditions, the amount of trapped LNAPL was higher than that measured by two‐phase tests at the same water saturation.
Influence of antecedent moisture content on residual LNAPL Saturation
Steffy, D. A. (author) / Barry, D. A. (author) / Johnston, C. D. (author)
Journal of Soil Contamination ; 6 ; 113-147
1997-03-01
35 pages
Article (Journal)
Electronic Resource
Unknown
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