No abstract

A novel Simpliˆed Image Analysis Method was developed and tested to assess the saturation distribution values for water and LNAPLs (Light Non-Aqueous Phase Liquids) in granular soils subjected to ‰uctuating groundwater conditions. This method, based on the Beer-Lambert Law of transmissivity, determines the saturation of water (Sw) and LNAPLs (So) by comparing the average optical densities (Di) for each matrix element of the tested domain to the corresponding average optical densities for three base pictures of the same domain taken with two digital cameras attached to two diŠerent band-passˆlters (l＝450 nm and 640 nm). Two equations with two unknowns (Sw and So) are deˆned for each mesh element, which enables the saturation distribution to be calculated under dynamic conditions. The three base conditions for the domain are: Method was then applied to analyze the behavior of two ‰uctuat-ing groundwater systems, namely, two-phase air-water and three-phase air-water-LNAPL, in a one-dimensional column, 3.5×3.5×50 cm,ˆlled with Toyoura sand. The mass balance of the drainage-imbibition three-phase airwater-LNAPL system showed a diŠerence of just 4.7z in LNAPL, demonstrating that this non-intrusive and non-destructive method is reliable for providing water and LNAPL saturation distributions throughout the domain when studying the eŠects of porous soil contamination by LNAPLs subjected to dynamic conditions.

No abstract

No abstract

No abstract