Lake wetland eutrophication evaluation model construction method

Abstract

The invention discloses a lake wetland eutrophication evaluation model construction method. The lake wetland eutrophication evaluation model construction method comprises the following steps: S1, constructing an ecological risk evaluation index system of a lake wet region; S2, determining a risk upper limit and a risk lower limit standard value of each index in the index system according to the existing standard values, and performing standardized processing on the data of each station; S3, carrying out risk degree calculation; S4, revealing the spatial and temporal distribution difference ofthe ecological risk of the lake wetland area; S5, setting water quality information; S6, setting pollution accidents; S7, inputting a hydrodynamic boundary condition; S8, running a simulation scheme;S9, reading the actual measurement data of the lake wet region monitoring points; S10, calculating the eutrophication level with the highest sum of the determinacy evaluation values; and S11, according to the main factors causing the lake wetland area risk in the step S4 and the curve analysis chart in the step S8, comparing the step S9 and the step S10, and generating a comprehensive evaluation model. The method has the advantages of being accurate in evaluation, visual, reliable, high in operability and the like.

Description

technical field [0001] The invention relates to the technical field of water environment pollution, in particular to a method for constructing a lake wetland eutrophication evaluation model. Background technique [0002] The eutrophication of lake wetlands refers to the fact that under the influence of natural factors and (or) human activities, a large amount of nutrients are input into the lake water body, so that the lake gradually changes from an oligotrophic state with a low productivity level to a eutrophic state with a high productivity level. A phenomenon of change. Lakes in nature are an inevitable process of their own occurrence, development, aging and extinction with the change of natural environmental conditions. The oligotrophic in the initial stage of lake formation gradually transitions to eutrophic until finally extinction. In the natural state, this evolution process of lakes is extremely slow, and it often takes thousands of years or even longer to complete...

AI Technical Summary

Problems solved by technology

Assuming that for a water body M, the influence of m+n evaluation factors needs to be considered comprehensively, a set of actual monitoring data is taken, among which the concentration values ​​of m evaluation substances belong to grade A, and the concentration values ​​of the remaining n evaluation substances belong to grade B , it is difficult to determine the trophic level of the water body M;

[0007] 2) For a certain evaluation index, it is unreasonable to divide the nutritional level only by its value as the threshold

[0008] 3) For the same value, different experts may think it belongs to different trophic levels, and human factors also directly affect the evaluation results