عنوان مقاله [English]
Of water resources is the basic human need. May in some areas, surface water resources is limited or no access to them easy. In these wells can be drilled, to the exploitation of groundwater. Due to population growth and Mhdvdbvdn surface water, groundwater control harvest growing in different parts of the country we are. equires continuous and increasing sources of drinking water contaminants, the exact amount of pollutants entering groundwater and Mathematical Modelling how to play them the necessities because reliance on sampling and testing in this context, time consuming and requires high cost. On the other hand, according to Mhdvdbvdn number of sampling points, it should be stated that studies on modeling Mathematical software and convert it to lead to significant savings in time Mlahzhyy, labor and pays. In this paper, modeling the distribution of water soluble pollutants is the case for publishing underground contaminants from pollution sources form continuous period of six months and $ 5000 ppm $ dealing took place and source of pollution has been cut. Based on mathematical modeling, transport phenomena, including infiltration and pollutant transport by underground water flows are in terms of form and solve equations and numerical finite difference method is done. The results of the model, if the emission of pollution frequently persists maximum concentration of pollutants, at the entrance to the underground water and the amount of the entrance), ie $ 5000 ppm $ (is, while if the sixth month source pollution is discontinued, the maximum concentration two months after discontinued pollutants, within 50 meters from leaks and equal to $ 3200 ppm $ will be, and seven months after the cessation of pollutant levels in distance 50 meters from leaks and equivalents $ 370 ppm $ is estimated. necessary noted that seven months after the cessation of emissions, pollution levels within 500 yards of the spill site, approximately equal to $ 50 ppm $ will be.