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A Coupling Simulation Method for Water and Nitrogen Transport in Large Basin Scale

A simulation method and scale technology, applied in the field of coupled simulation of water and nitrogen migration at the large watershed scale, to achieve the effect of improving accuracy

Active Publication Date: 2021-12-07
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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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 migration coupling simulation method, thereby solving the aforementioned problems existing in the prior art

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  • A Coupling Simulation Method for Water and Nitrogen Transport in Large Basin Scale
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  • A Coupling Simulation Method for Water and Nitrogen Transport in Large Basin Scale

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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0057] Such as Figure 1 to Figure 7 As shown, in this embodiment, a large watershed-scale water and nitrogen migration coupling simulation method is provided, including the following steps,

[0058] S1. According to the surface hydrological process and combined with the total amount of nitrogen on the surface, calculate the dissolved nitrogen content that is lost with surface runoff, infiltrated into the soil, and stored in surface depressions due to nitrogen deposition and fertilization;

[0059] S2. Based on the soil hydrological process, calculate the source-sink item, and use the convection-...

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Abstract

The invention discloses a large watershed-scale water and nitrogen migration coupling simulation method, including S1, according to the surface hydrological process, combined with the total amount of surface nitrogen, respectively calculating the loss with surface runoff and infiltration to the surface due to nitrogen deposition and fertilization. Soil and dissolved nitrogen content stored in surface depressions; S2. Based on the soil hydrological process, calculate the source-sink term, and use the convection-dispersion equation to calculate the nitrogen concentration in each layer of the soil according to the source-sink term; S3. Based on the groundwater hydrological process, Use the mass conservation equation to calculate the nitrogen concentration in the groundwater; S4. Calculate the nitrogen concentration in the slope ditch by using the convection-dispersion equation according to the hydrological process of the slope ditch; S5. Calculate the nitrogen concentration in the river section by using the convection-diffusion equation according to the hydrological process of the river channel. The advantages are: the accuracy of hydrological process simulation is improved, and the channel cross-section flow and the concentration of pollutant nitrogen during the permafrost thawing 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 周祖昊刘水清李佳蒋云钟严子奇刘佳嘉贾仰文王浩
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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