Method for determining uncertainty and risk degree of small riverway pollutant degradation coefficient

Abstract

The invention relates to a method for determining the uncertainty and the risk degree of a small riverway pollutant degradation coefficient. The method comprises the following steps that 1, the selected pollutant concentration C0 of a riverway upstream initial section where the uncertainty and the risk degree of the pollutant degradation coefficient need to be determined and the average flow speedu of a riverway are measured; 2, the selected pollutant concentration C(x) at the position which is x meters away from the initial section is repeatedly measured n times, and the actually measured mathematical expectation E(C) and variance D(C) of the selected pollutant concentration C(x) at the position which is x meters away from the initial section are obtained; 3, the degradation coefficientk of this kind of pollutants is obtained; 4, a theoretical variance formula of the pollutants is obtained according to a random differential equation, the degradation coefficient k and the actually measured variance D(C) of the pollutants are also used, so that the uncertainty alpha of the pollutant degradation coefficient is obtained; 5, the ratio of alpha 2 to the riverway pollutant degradationcoefficient k is calculated and compared with a risk threshold, and the risk degree of the degradation coefficient is determined. By means of the method, the uncertainty, caused by various reasons, ofthe degradation coefficient of the pollutants in the riverway and risks caused by the uncertainty to riverway management can be effectively estimated.

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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