Simulation Study of the Natural Transport of 1,2-dichloroethanein Groundwater Based on GMS in a Contaminated Area
This study focused on groundwater pollution in a contaminated site with 1,2-dichloroethane in Putuo District,Shanghai,and conducted groundwater pollution-related research,employing numerical simulations to analyze the contaminant's diffusion trends under both natural and pumping conditions.The study collected and analyzed data on pollutant locations,concentrations,depths,and the hydrogeological conditions of the site by the preliminary environment investigation result.The groundwater flow field in the area and the migration of 1,2-dichloroethane under different pumping conditions were simulated using the MODFLOW and MT3DMS models within the groundwater modeling system(GMS).The study indicated that under the influence of the natural groundwater flow field,the diffusion of 1,2-dichloroethane with initial concentration of 7.2 mg/L was primarily affected by the direction of groundwater flow.After a 10-year period,the concentration of pollutant at the center of the contamination site still remained at 2.7 mg/L,and the spread of the pollutant continued to increase.The pumping action of extraction wells had a significant impact on the natural dispersion of pollutants.With increase of extraction wells,the center concentration of the pollutant plume had decreased to below 0.03 mg/L after 700 days of pumping,meeting the requirement of Class IV screening value specified in the Groundwater Quality Standards.
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