Development of integrated numerical method for predicting soil and groundwater pollution based on atmosphere linked model

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1.Objective of the studyGroundwater pollution by chlorinated hydrocarbons, such as trichloroethylene (TCE) causes a serious environmental problem because of their carcinogenic characteristics. Behaviors of leaked pollutant or diffusive material can be dealt with transport processes in porous media, consisting of two parts, volatile gases migration in unsaturated zone and liquids phase convective dispersion in aquifer. The objective of the study is to model the pollution migration in soil and groundwater and to apply it to practical field sites based on a pollution migration scheme, by Dr. Takano and a coupled soil and lower atmosphere linked model (SALSA : Soil Atmosphere Linking Simulation Algorithm). The investigation is carried out by next four steps, i)modeling of pollution migration in soil accounting for transport processes on momentum, heat and mass in atmosphere, ii)introduction of the boundary conditions at a surface, iii)coupling of the pollution migration model in soil and aquifer, iv)parameter sensitivity analysis and application for field site.2)Results of the studyProf. Sato, Prof. Wada and Prof. Asaeda carried out numerical simulations using the VOC migration model in shallow unsaturated layer. The results gave that soil moisture and temperature play significant role in the migration, and rainfall enhances the downward transport of pollutant. Dr. Takano investigated the evapotranspiration rate and drainage water quality through meteorological and hydrological observations on the rooftop of a building at Kinki University. Prof. Sato, Prof. Asaeda and Mr. Sasaki made a basic mathematical model of VOC transport in saturated porous media by laboratory experiments in uniformly packed glass beads. A new migration model in aquifer has been developed to predict pollutant behavior in saturated and unsaturated porous media, and application for investigated field site by Prof. Sato, Prof. Asaeda, Prof. Wada and Mr. Sasaki.