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A method for assessing the water environment security of a watershed based on the risk of non-point source nitrogen and phosphorus loss

A safety assessment, non-point source technology, applied in the fields of resources, instruments, data processing applications, etc., can solve the problems of inability to accurately quantify nitrogen and phosphorus, and the risk of loss of receiving water pollution.

Active Publication Date: 2021-10-15
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

This method also cannot accurately quantify the risk of nitrogen and phosphorus loss to the pollution of receiving water bodies.

Method used

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  • A method for assessing the water environment security of a watershed based on the risk of non-point source nitrogen and phosphorus loss
  • A method for assessing the water environment security of a watershed based on the risk of non-point source nitrogen and phosphorus loss
  • A method for assessing the water environment security of a watershed based on the risk of non-point source nitrogen and phosphorus loss

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Embodiment Construction

[0050] The method for water environment safety assessment of the watershed proposed by the present invention is a method for quickly estimating the risk of non-point source nitrogen and phosphorus loss in the watershed by combining the attenuation factor with the multi-criteria analysis method based on the result of simulating the nitrogen and phosphorus pollution load by the SWAT model.

[0051] See figure 1 , the present invention is a method for assessing the water environment safety of a basin based on the risk of non-point source nitrogen and phosphorus loss. The specific steps of the method are as follows:

[0052] step one:

[0053] This case selects the small watershed of the Naoli River located in the eastern part of Heilongjiang as a case study. In this case, through data collection, remote sensing interpretation and on-site investigation, a database of meteorology, land use, soil and farmland management required for SWAT model simulation is established. On the basi...

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Abstract

A method for assessing the water environment safety of a basin based on the risk of non-point source nitrogen and phosphorus loss. The steps are as follows: 1. Selection of research area, SWAT model to simulate nitrogen and phosphorus loss load; 2. Calculation of rainfall runoff factor; 3. Soil permeability factor 4. Calculation of transport distance factors; 5. Data standardization; 6. Calculation of evaluation index weights; The invention can realize the accurate estimation of non-point source nitrogen and phosphorus loss at the watershed scale, and helps to reflect the temporal and spatial heterogeneity characteristics of non-point source nitrogen and phosphorus loss, and also contributes to the optimal management of water environment in the watershed. The invention helps to establish the relationship between the water environment safety of the basin and the time-space distribution of non-point source nitrogen and phosphorus loss, can quickly and effectively identify the key source area of ​​opinion loss during the critical period of non-point source nitrogen and phosphorus loss risk, and can contribute to the scientific management of the water environment of the basin Provide guidance and assistance.

Description

【Technical field】 [0001] The invention relates to a method for assessing the water environment safety of a watershed based on the non-point source nitrogen and phosphorus loss risk, which rapidly evaluates the water environment safety of the watershed by identifying and screening the risk level of nitrogen and phosphorus loss in the watershed. The invention belongs to the technical field of comprehensive evaluation of watershed pollutants. 【Background technique】 [0002] Nitrogen and phosphorus are one of the essential elements for crop growth and also the main limiting factor of water eutrophication. The loss of nitrogen and phosphorus caused by agricultural activities is one of the important reasons for water eutrophication. The eutrophication of water body poses a serious threat to the safety of water environment and leads to a series of environmental, social and economic problems. As a country with a large population and limited arable land per capita in the world, Chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F16/29G06Q10/06G06Q50/26
CPCG06Q10/06393G06Q50/26G06F30/20
Inventor 欧阳威郝新林春野连仲民高翔魏鹏
Owner BEIJING NORMAL UNIVERSITY
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