A method for measuring the dispersion of pollutants by means of a plif measurement system in wind-induced flow tests

Abstract

The invention discloses a method for measuring the diffusion of pollutants through a PLIF measurement system in a wind-induced flow test, performing standard solution proportioning according to the maximum value of solution concentration, performing solution proportioning according to n concentration gradients, and placing the container in the model Add the water in the model to the container at a certain position of the laser point, the water level in the container is consistent with the water level of the model, and the concentration value is 0 at this time, and the brightness of the spot at this time is recorded by the camera; the standard concentration solution Put it in a container, place it at any laser point position in the model, and record the spot brightness at this time through the camera; draw the relationship curve between σ and μ, and fit it to obtain a calibration curve. According to the calibration curve, any measurement point can be induced to emit laser light. The gray value of the fluorescence is restored to the concentration value, and the isoline of the concentration distribution is generated by interpolation. The invention has the characteristics of convenient use, convenient operation, strong practicability and the like.

Description

technical field [0001] The invention belongs to the technical field of wind-induced flow tests, in particular to a method for measuring pollutant diffusion through a PLIF measurement system in wind-induced flow tests. Background technique [0002] Wind is an important dynamic factor that causes lake water mixing. When wind acts on the water surface, it disturbs the water surface violently, and its shear stress will form water surface drift or wind-induced flow. Under continuous action, due to the constraints of the shore boundary and bottom boundary, the water body will also Form vertical circulation and horizontal circulation. In the vertical direction, the shear stress under the action of the wind forms a wind-induced flow in the same direction as the wind on the surface and upper layer of the water body, which will cause the water level on the windward bank to rise, and the water surface will have a reverse slope; while the lower layer of the water body will also form a h...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for measuring the diffusion of pollutants through the PLIF measurement system in the wind-induced flow test, aiming to solve the problem of inaccurate measurement of pollutant diffusion in the physical model tests of large shallow lakes with low flow velocity and shallow water depth. question

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