Method for Determining Uncertainty and Risk Level of Pollutant Degradation Coefficient in Small River Course

Abstract

The invention relates to a method for determining the uncertainty of the degradation coefficient of small-scale river pollutants and its risk degree, which comprises the following steps: (1) measuring the selection of the initial section of the upper reaches of the river where the uncertainty of the pollutant degradation coefficient and the degree of risk need to be determined Fixed pollutant concentration C 0 , the average flow velocity u of the river; (2) repeatedly measure the concentration C(x) of selected pollutants at x meters from the initial section for n times, and obtain the concentration C(x) of selected pollutants at x meters from the initial section The measured mathematical expectation E(C) and variance D(C); (3) Find the degradation coefficient k of the pollutant; (4) According to the theoretical variance formula of the pollutant obtained by the stochastic differential equation, combined with the degradation coefficient of this type of pollutant k and the measured variance D(C), calculate the uncertainty α of the pollutant degradation coefficient; (5) calculate α 2 The ratio of the degradation coefficient k to the river pollutants, and compared with the risk threshold, determines the degree of risk of the degradation coefficient. The invention can effectively estimate the uncertainty of the pollutant degradation coefficient in the river channel due to various reasons and the risk brought by it to the river channel management work.

Description

technical field [0001] The invention relates to a method for determining the uncertainty of the degradation coefficient of small-scale river pollutants and its risk degree, and belongs to the field of river water quality management. Background technique [0002] With the development of economy and society, some small rivers in my country are seriously polluted, and it is urgent to determine the pollution-holding capacity or environmental capacity of these rivers. In the process of determining the pollution-holding capacity or environmental capacity, determining the degradation coefficient of pollutants is an important and basic task. Whether the determination of the degradation coefficient is accurate or not is related to the effect of river management. Affected by the natural environmental factors of river water bodies, the degradation coefficient of pollutants has a certain degree of uncertainty; however, at present, little attention has been paid to the uncertainty of the...

AI Technical Summary

Problems solved by technology

Affected by the natural environmental factors of river water bodies, the degradation coefficient of pollutants has a certain degree of uncertainty; however, at present, little attention has been paid to the uncertainty of the degradation coefficient of pollutants in small rivers and the risks it brings, which affects the accuracy of river water quality. management poses great difficulties

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