Copula function-based basin nitrogen metabolism environment risk evaluation method

Abstract

The invention discloses a Copula function-based basin nitrogen metabolism environment risk evaluation method, which comprises the steps of establishing a basin nitrogen metabolism network model, and calculating a nitrogen substance flow; fitting an edge distribution function of the atmospheric nitrogen discharge amount, the surface water nitrogen load amount and the soil nitrogen accumulation amount; constructing a ternary joint distribution function of the atmospheric nitrogen discharge amount, the surface water nitrogen load amount and the soil nitrogen accumulation amount; calculating a multivariate joint distribution function value according to the ternary joint distribution function, and performing environmental risk evaluation; identifying key influence factors of the nitrogen metabolism environment risk by utilizing a principal component analysis method; and obtaining the interaction relationship among the influence factors of the nitrogen metabolism environment risk by using adrift diameter analysis method. According to the method, evaluation and grading of the nitrogen metabolism environment risk in the drainage basin are achieved according to multivariate joint distribution function values; key influence factors of the nitrogen metabolism environment risk are identified, the interaction relationship among the influence factors is explored, and a forming mechanism ofa basin nitrogen metabolism environment risk source is disclosed.

Description

technical field [0001] The invention belongs to the field of environmental risk control, and in particular relates to a watershed nitrogen metabolism environmental risk assessment method based on a Copula function. Background technique [0002] Non-point source pollution has the characteristics of dispersion, uncertainty and complexity. In order to effectively solve the problem of non-point source nitrogen pollution in watersheds, it is very necessary to evaluate the environmental risk of nitrogen metabolism. [0003] At present, the research on the environmental risk assessment of nitrogen metabolism is mainly carried out on the basis of the loss load of nitrogen pollution sources. The evaluation methods are multi-factor comprehensive evaluation method, nitrogen index method, distributed non-point source pollution model evaluation method, etc. Less consideration should be given to the comprehensive environmental risk of nitrogen metabolism and the uncertainty of environment...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a watershed nitrogen metabolism environmental risk assessment method based on the Copula function, to solve the problem that the comprehensive environmental risk of nitrogen metabolism and the uncertainty of environmental risk assessment results are less considered in existing methods

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