Application Of Finite Volume Method In Numerical Simulation Of Seepage Flow Of Heavy Metal Pollutants In Soil

In recent years, with the sharp increase in population and the rapid development of industry and agriculture, heavy metal pollution in soil becomes more and more serious. Environmental pollution and ecological deterioration become more and more serious, and at the time destroying ecology is accompanied by jeopardizing human health as well.Numerical simulation is an effective method to solve practical problems.The main purpose of this paper is to study effects due to the theory of hydrodynamics and solute transport, by using the finite volume method to solve the transport model of heavy metal pollutants and using the MATLAB language to simulate the dynamic process of heavy metal pollutants in soil migration. Based on visual processing and comparative analysis of the calculation results, main results are as follows:(1) Aim at the problem of liquid heavy metal pollutants seepage in soil, we can get the change rule of hydraulic head and seepage discharge under the given seepage with different unit of storage capacity and osmotic coefficients, and find that both unit of storage capacity and osmotic coefficient have different influence on liquid heavy metal pollutants migration in soil. And, we also conclude that the smaller unit of storage capacity it is, the faster speed of the liquid heavy metal pollutants transport; the smaller osmotic coefficient it is, the slower speed of the liquid heavy metal pollutants transport and vice versa.(2) we can get the change rule of pollutant concentration under the given seepage with different soil density, distribution coefficient, soil moisture content, convection velocity, dispersion velocity, and find that all of them have different influence on heavy metal pollutants migration in soil. And, we also conclude that at the same time, the faster convection velocity it is, the wider scope of heavy metal pollutants transport; the faster dispersion velocity it is, the wider scope of heavy metal pollutants transport; the higher soil moisture content it is, the wider scope of heavy metal pollutants transport; the greater distribution coefficient it is, the smaller distance of heavy metal pollutants transport; the larger soil density it is, the smaller scope of heavy metal pollutants transport and vice versa.When heavy metal pollution spill occurs, the above research work can provide theoretical guidance for controlling heavy metal pollutants seepage and further development, and then, for greater range of pollution prediction, evaluation, decision-making. It has a far-reaching practical significance.