Document Type : علمی - پژوهشی
Department of Soil Science, Faculty of Agriculture, Tarbiat Modares University, Tehran
Department of Soil Science, Faculty of Agricultural Sciences, University of Guilan, Rasht
Department of Civil Engineering, Faculty of Engineering, Shahid Chamran University, Ahvaz
Quantitative description of soil hydraulic properties is crucial for preventing organic contaminations entering into the soil and groundwater. In order to assess hydraulic behavior of Perchloroethylene, as a toxic chlorinated contaminant in soil, retention curves of Perchloroethylene and water were determined. The Saturated hydraulic conductivity of both examined fluids was determined by constant head method. The Perchloroethylene and water hydraulic conductivities were obtained to be 492.84 and 450.27 cm day-1, respectively. The porous medium retention parameters is obtain based on van Genuchten, Brooks-Corey and Kosugi retention models. Further, the unsaturated hydraulic conductivity for both fluids were obtained based on Mualem-Brooks-Corey, Mualem-van Genuchten and Mualem-Kosugi models. The accuracy performance of models were assessed by some statistics including ME, RMSE, EF, CD and CRM. Results indicated that the van Genuchten model providing better estimations than other models when the studied fluid was Perchloroethylene. The results further indicated that the magnitudes of the pore-size distribution parameters and the bubbling pressure parameters are reduced in water-air system compares to Perchloroethylene -air system. This can be attributed to high viscosity of water and its considerable resistance against flow. This implies that more suction is needed to drain out water from porous medium than Perchloroethylene. Consequently, porous medium provides less retention for Perchloroethylene at a given quantity of fluid than water. Owing to less amount of Perchloroethylene viscosity, the saturated and unsaturated porous medium hydraulic conductivity of Perchloroethylene was more than that of water. Since Perchloroethylene has lower retention and larger hydraulic conductivity than water, its infiltration into porous medium would lead to faster movement towards groundwater.
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