System and method for calculating lateral mixing coefficient of pollutants in vegetated ecological rivers

By dividing the test areas in the duplex river channel, measuring the pollutant concentration and considering the vegetation characteristics, the TMC empirical formula is constructed, and the problem of calculating the lateral mixing coefficient of pollutants in the presence of vegetation in the duplex river channel is solved, and high-precision lateral mixing process prediction is achieved, which has important environmental management and protection significance.

CN118981585BActive Publication Date: 2025-04-18CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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Patent Information

Application Number
CN202411099945.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-12
Publication Date
2025-04-18
Estimated Expiration
2044-08-12

AI Technical Summary

Technical Problem

The prior art is difficult to effectively calculate the lateral mixing coefficient of pollutants in the presence of vegetation in the complex river channel, resulting in the complexity of the lateral mixing process.

Method used

A vegetated ecological river channel pollutant lateral mixture coefficient calculation system and method is proposed. Through regional determination units, actual measurement units, prediction units and error units, the complex river channel test areas are divided, the pollutant concentration is measured, the TMC relationship formula is constructed, and new influencing factors are introduced to consider the vegetation characteristics, and the TMC empirical formula is constructed to verify its accuracy.

Benefits of technology

The accurate calculation of the transverse mixing coefficient of pollutants in vegetation areas and non-vegetation areas in the duplex river channel is achieved, the prediction accuracy of the transverse mixing process is improved, and it has important environmental management and protection significance.

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Abstract

The system and method for calculating the lateral mixing coefficient of pollutants in vegetated ecological rivers, by selecting three different types of vegetation, carried out pollutant concentration tests in flumes with vegetation on beach, and calculated the measured TMC values ​​by linear graphical method. Through dimensional analysis, the parameters affecting TMC were studied, and the characteristics of vegetation were innovatively taken into account, and the adjustment length scale was introduced and dimensionless with the vegetation inundation height, so as to construct a new TMC influencing factor. Based on the flume test results and dimensional analysis, the flume was divided into the slope-main flume area and the slope-beach area in the horizontal direction, and the empirical formula for TMC prediction was constructed for each area. Error analysis shows that the formula can predict TMC well. The system and method for calculating the lateral mixing coefficient of pollutants in vegetated ecological rivers of the present invention are of great significance for evaluating the diffusion of pollutants, predicting the response and stability of ecosystems, and guiding related environmental management and protection work.
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