ABSTRACT: In this study, the results of NAPL Simulator which is used to predict the behavior of benzene (an LNAPL) under fluctuating groundwater table conditions are analyzed. A very good correlation was found between water saturation, capillary pressure and the location of the water table, and it was confirmed that the hysteresis phenomenon makes the S-p relations history and path dependant. A slightly modified NAPL Simulator code made a good prediction of water saturation, water flow, LNAPL flow, water table and LNAPL table of the column test. The modified version was then used to simulate the behavior of benzene at a contaminated subsurface under the influence of groundwater table fluctuation and the results were compared to the actual in-situ investigated results. Both the simulation and the actual investigated results showed a great correspondence, demonstrating that the modified NAPL Simulator code predicts accurately the behavior of benzene under fluctuating water table conditions.
Annuals No. 49, Kyoto, Japan; 01/2006