Numerical Simulation Of Groundwater Petroleum Contaminant Transport

Groundwater Modeling System(GMS) software was used in this dissertation to carry on the numerical simulation of groundwater system of a petroleum leakage location in Baoding,Hebei province.Firstly,the hydrology geological investigation was taken to the research area,and the pumping test and tracer test were carded on.Aquifer test,a test software,and a curve fitting method were used to seek hydrogeology parameter.Then the numerical simulation of the research area with GMS was carried on to establish water conceptual model and the mathematical model of the groundwater in the research area. The MODFLOW module was used for the mathematical model solution.The aquifer parameter of the model was divided into 9 areas and the union pumping test data was used to modulate to the aquifer parameter.After that,the good result in which the computation error conformed to the national standard was obtained,so it could reflect well the dynamic behavior of the groundwater system in research area.The water quality model of the chloride ion on the base of the groundwater flow model was established.The MT3D module was used for the mathematical model solution.The water quality model was tested by contrasting the actual data with the predicted data of the density distribution of the chloride ion to define the dispersity of these 9 districts in research area.Four kinds of schemes were used to forecast the migration situation of petroleum pollutant in the research area.The proposalⅠwas 5 years forecast,the petroleum pollutant formed the contamination plume and expanded around year by year,and the pollutant concentration grew 4.5 times during 5 years in mainly polluted area.The proposalⅡaimed at the situation of the whole year precipitation increased by 50%,the scope of the contamination plume expanded and the concentration increased,and the most units increased 606ppm which was 3 times larger than before.The proposalⅢconsidered the situation of the agriculture well pump,the pollutant concentration all doubled than that when the agriculture well pump was not considered in the three pollution areas.The proposalⅣconsidered the degeneration of microorganisms to the petroleum pollutant, the pollutant concentration dropped 10%in the pollution area.In respect of the Hydrocarbon Degradation Bacteria in the research area,in-situ bioremediation could be an advantageous and economical feasible method to control the petroleum pollution in this area.