Abstract
ABSTRACT In the current study, three Ng tests were performed to simulate the LNAPL contaminants’ transport and fate in the porous media. Through the tests, the efficacy of the soil–cement vertical barriers with a low permeability, which is among the most-used techniques in site remediations in practical projects, was assessed, and the results were compared to that of free field condition. Furthermore, extensive insight was achieved into the migration pattern of the LNAPL in unsaturated soil. All of the Ng tests were implemented at 40 g to simulate a voluminous spill of LNAPL in various timeframes. Consecutive imaging through the transparent front was used to gather data, and the LRV image processing technique was utilized to analyze these data. Reliable and effective performance of the barriers for containing the LNAPL spread was confirmed. Groundwater depression was observed in all three tests, particularly in the tests with using barriers. Nevertheless, using barriers restrained the contaminated soil and groundwater to the zones between the two barriers. Based on the observed LNAPL plume, the minimum depth of these barriers was recommended to account for the preferential flow. Three different methods were used for the validation of the image processing results. All in all, the accuracy of image processing was satisfactorily high.
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