Abstract
Wastewater reuse has significant social, economic and ecological benefits, and has become an important measure to alleviate the water crisis. In this paper, in the simulation analysis of soil nitrate nitrogen, the method of combining soil column leaching and model simulation is used to test the accuracy of the model. The Pearson correlation coefficient is as high as 0.99 and the Nash coefficient is also over 0.9. It shows that the simulation results of the simulation model are credible. The Hydrus-1D model is used to visually simulate the change process of Tianjin fluvo-aquic soil over time. In the simulation, the process of solute migration in the 6-18 cm of the ground surface is basically the same, and they all reach a stable state about 4 hours, and show a linear increase trend four hours ago, and then the concentration remains stable and unchanged.
Highlights
The migration law of pollutants in the unsaturated zone has become an important content of groundwater pollution risk assessment[1]
Through indoor soil column experiments, the physical and chemical parameters of the fluvo-aquic soil and the vertical leaching process data are obtained, the simulation parameters are verified through the measured data, and the Hydrus-1D model is used to simulate the vertical migration process in the vadose zone
The simulation results are input into the simulation software as the initial conditions for the simulation to realize the quantitative simulation of the cumulative effect of multiple sewage irrigation and predict the vertical distribution law in the vadose zone
Summary
The migration law of pollutants in the unsaturated zone has become an important content of groundwater pollution risk assessment[1]. Research on the migration mechanism and cumulative effects in the soil vadose zone can provide early warning of potential groundwater environmental pollution. Through indoor soil column experiments, the physical and chemical parameters of the fluvo-aquic soil and the vertical leaching process data are obtained, the simulation parameters are verified through the measured data, and the Hydrus-1D model is used to simulate the vertical migration process in the vadose zone. The simulation results are input into the simulation software as the initial conditions for the simulation to realize the quantitative simulation of the cumulative effect of multiple sewage irrigation and predict the vertical distribution law in the vadose zone
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