Rapid isoconcentration line observation method for river transverse diffusion coefficients

Abstract

The invention belongs to the technical field of environmental hydraulics and water quality model analysis and relates to a rapid isoconcentration line observation method for river transverse diffusion coefficients. The rapid isoconcentration line observation method comprises the steps: firstly, converting a concentration distribution analytic solution of a river two-dimensional convection diffusion abbreviated equation under the condition of constant strength shores or central point source discharge to solve geometrical feature parameters and a standard curve equation of river pollutant concentration distribution isoconcentration lines/equal chromaticity lines, wherein the river two-dimensional convection diffusion abbreviated equation is generally used by a tracer testing method and ignores a longitudinal diffusion effect; then rapidly observing site isoconcentration lines of the river transverse diffusion coefficients. By means of shapes and ranges of the river pollutant concentrate distribution isoconcentration lines/equal chromaticity lines, the characteristics of tracer agent concentration distribution/pollution zones can be macroscopically reflected, and a total effect of transverse diffusion and mixing of a river to varieties of pollutant is better embodied. The method is simple and has convenience in operation, sampling and analyzing tracer agent concentration distribution is avoided, workload is small, cost is small, and observation data are accurate.

Description

Technical field: [0001] The invention belongs to the technical field of environmental hydraulics and water quality model analysis, and relates to a method of uniformly injecting tracer dyes into sewage pipes (canals) or discharging them at experimental drop-in points, using unmanned aerial vehicle camera devices to take pictures and digital image processing technology, and analyzing river The isoconcentration / isochromaticity line of the concentration distribution of pollutants is used to determine the lateral diffusion coefficient, especially a rapid observation method of the isoconcentration line of the lateral diffusion coefficient of the river without sampling and analysis of the tracer concentration distribution. Background technique: [0002] Environmental hydraulics and water quality models are emerging disciplines that study the diffusion and mixing, transport and transformation of pollutants in water bodies and their applications. It is the product of the combination ...

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Problems solved by technology

There are great differences in the shape and hydraulic conditions of rivers in the east, west, and north and south of my country, and the accumulation of on-site tracer test observation data on the lateral diffusion coefficient of natural rivers is still quite scarce. Calculation and water environmental impact prediction and evaluation bring great inconvenience

[0012] In summary, although the tracer test method is the most reliable and direct method to calculate the lateral diffusion coefficient in natural rivers, this technical method can only determine the lateral diffusion coefficient through on-site sampling and analysis of the tracer concentration distribution. , Laboratory analysis, experimental observation, data collation and other shortcomings such as heavy workload, time-consuming and labor-intensive, large capital demand and slow output of results, etc.

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