چكيده لاتين :
One ofthe most important pollutants of groudwaters is nitrate. Different human activities including the application
of chemical fertilizers in agriculture, causes the emission of nitrate into groudwaters. In this paper, the dynamic effect
of soil moisture on carbon and nitrogen cycles has been analyzed by presenting a connection between soil moisture
sample and nonlinear differential equations. At present, wide researches are carried out on modeling soil moisture
control in solution flows contain nitrate. In order to do so, separation of energy conservation law equations is carried
out by a particular method. The mathematical model governing the nitrate containing current in non-isotropic
environment has been presented in the form of combined equations. Equation for distribution in multiple
environments and Darcy rule has been considered in this model. Then, using finite volume method, separation of
flows contain nitrate in porous media is carried out. The current flux is obtained from central difference
approximations or upwind approximation. Mashad plain has been considered for case study at this research. Carrying
out calibration operation, the measured results have been contrasted with numerical results of finite volume method.
After testing the model, it is possible to foresee the way of nitrate changes in other nodes of calculation network.
Using these forecasts, the quality of drinking water for several next years is determined. Carrying out numerical
modeling by finite volume method, it is found out that the quality ofdrinking water ofMashad plain would be suitable
for the next ten years
