Nitrogen migration and transformation coupling simulation method and system for dry-wet alternating zone

Abstract

The invention discloses a dry-wet alternating zone nitrogen migration and transformation coupling simulation method. The method comprises the following steps: (1) establishing a surface water nitrogen migration and transformation simulation model; (2) establishing an underground water nitrogen migration and transformation simulation model; (3) driving the underground water nitrogen migration and transformation simulation model by taking the water pressure and concentration calculation value of the water-soil junction obtained by the surface water nitrogen migration and transformation simulation model as a boundary condition; and (4) quantifying the growth and disappearance process of the nitrogen in the dry-wet alternating zone and the influence of the growth and disappearance process of the nitrogen on the water environment quality of the overlying water through a surface water nitrogen migration and transformation and underground water nitrogen migration and transformation coupling model. The invention further discloses a nitrogen migration and transformation coupling simulation system for the dry-wet alternating zone. According to the method, the water pressure and concentration calculation values of the surface water model at the water-soil junction are used as boundary conditions to drive the underground water model, the dynamic change of each nitrogen index concentration of the surface water in the dry-wet alternating zone and the influence of the dynamic change on the underground water are considered, and the accuracy of simulating the nitrogen migration and transformation process of the dry-wet alternating zone is improved.

Description

technical field [0001] The present invention relates to a simulation method and system, in particular to a method and system for coupled simulation of nitrogen migration and transformation in wet and dry alternating belts. Background technique [0002] As an important method for the study of solute transport and pollutant diffusion, numerical simulation makes up for the deficiency of physical experiments that cannot be monitored globally. The alternating dry and wet areas of rivers, lakes and reservoirs, including the coastal zone, the undercurrent zone, and the ebb and flow zone of the reservoir area, are the key areas of the hydrological biogeochemical cycle of the aquatic ecosystem and play an important role in the health of the entire aquatic ecosystem. The hydrodynamic and nitrogen cycle processes of surface water and groundwater in the alternating dry and wet area interact with each other, and form a mixed area of ​​nitrogen migration and transformation at the water-so...

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Problems solved by technology

[0004] Purpose of the invention: The present invention aims to provide a coupling simulation method and system for nitrogen migration and transformation in alternating dry and wet zones, so as to solve the simulation distortion of nitrogen migration and transformation in alternating dry and wet zones and the problem of low precision

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