Large-watershed scale water nitrogen migration coupling simulation method

Abstract

The invention discloses a large-watershed scale water nitrogen migration coupling simulation method. The method comprises the steps of S1 according to a surface hydrological process and in combination with the total amount of surface nitrogen, respectively calculating dissolved nitrogen components which are lost along with surface runoff, infiltrated into soil and stored in surface depression due to nitrogen settlement and fertilization settlement to the surface; S2 on the basis of the hydrological process of the soil, calculating a source convergence item, and calculating the nitrogen concentration of each layer of the soil by using a convective dispersion equation according to the source convergence item; S3 according to the hydrological process of the underground water, calculating the nitrogen concentration of the underground water by using a mass conservation equation; S4 according to the hydrological process of the slope surface ditch, calculating the nitrogen concentration in the slope surface ditch by using a convective dispersion equation; and S5 according to the hydrological process of the river channel, calculating the nitrogen concentration of the river channel section by using the convective dispersion equation. The method has the advantages that the accuracy of hydrological process simulation is improved, and the river section flow and the concentration of pollutant nitrogen in the frozen soil melting period can be well simulated.

Description

technical field [0001] The invention relates to the technical field of nitrogen cycle in cold regions, in particular to a coupling simulation method for large watershed scale water and nitrogen migration. Background technique [0002] Due to the increase in population and the accelerated development of industrialization, the amount of nitrogen fertilizer application, the amount of livestock and poultry breeding, and the amount of domestic sewage in urban and rural areas are also gradually increasing and enter the ecosystem through human activities, destroying the balance of the original ecosystem and causing soil pollution. Pollution, water eutrophication and other issues. During the soil freezing process in cold regions, a large amount of non-point source nitrogen pollutants will remain. During the thawing process, along with the melting of permafrost, ice and snow, and spring precipitation, it will enter the surface and groundwater bodies, resulting in a rapid decline in w...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a large watershed scale water and nitrogen mig

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