| The groundwater of Shanghai Pudong site is seriously polluted by chlorinated hydrocarbons.The purpose of this project is to investigate the types of pollutants within the site in Pudong,pollutant concentration distribution and migration of pollutants,the establishment of pollutant concentration distribution and migration of the model,to provide first-hand information for the site’s environmental health risk assessment and possible repair work on the future pollution site.Literature review briefly describes the hazards of chlorinated hydrocarbons under the groundwater contaminant transport mechanism and the main site investigation process.The main content of this study include the construction of the Pudong site geological structure model,the distribution of the plume,the plume migration and site assessment of natural attenuation.Use 46 monitor wells’ borehole as origin data,and simulate the geologic of the site by Solid mode of GMS.Use water level data of monitor wells and natural boundary condition as origin data,then simulate the groundwater flow below the site.From March 9th to July 18th in 2011,we have sampled 3 times from groundwater with analysis followed in the site.Then GMS software was used to depict the TCA,DC A,and CA plume to characterized the contaminated situation of the groundwater in the site.By comparing this 3 VOCs’ concentration in all monitor wells,we get the attenuation trend and process of chlorinated hydrocarbons and the result tend to be that the main attenuation process in the site was TCA-DCA-CA.Besides,TCA-DCA was the most happening process while little DCA translated to CA.Based on the groundwater transport model,the sensitivity analysis method developed by Hill was used to analysis 6 parameters’ sensitivity and we found two pair correlated parameters and that Porosity,supply concentration and biological degradation rate had bigger influence on the transport of TCA in the groundwater than other parameters. |
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