River flow real-time online measuring device and method based on double-aperture bubble image

Abstract

The invention discloses a river flow real-time online measuring device which comprises a plurality of measuring units, each measuring unit comprises a first pipe body and a second pipe body which are fixedly bound, the first pipe body is provided with a first air outlet hole, the second pipe body is provided with a second air outlet hole, and the first pipe body and the second pipe body serve as breather pipes to be connected with an oil-free air pump, the first pipe body and the second pipe body sink to the river bottom and are attached to the river bed, and the aperture of the first air outlet hole is larger than that of the second air outlet hole. The invention further discloses a river flow real-time online measuring method, compared with a traditional rotor flow meter and other contact type measuring methods, the measuring instrument does not need to be placed in water flow, and installation and maintenance are easier and more convenient. Compared with non-contact measurement methods such as an ADCP, a radar flow meter and a surface flow field image flow measurement method, the flow can be directly measured, and the conversion relation between the surface flow velocity and the vertical line average flow velocity does not need to be calibrated through a rotor flow meter. Compared with an existing rising bubble method, the method is more suitable for natural rivers with complex section shapes, and the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of river flow monitoring, and in particular relates to a device and method for real-time on-line measurement of river flow based on double-aperture bubble images. Background technique [0002] The flow measurement of natural rivers is very important for water conservancy project construction, flood control and disaster reduction, water environment protection, river management, etc. At present, there are mainly two methods for measuring the flow of natural rivers: contact and non-contact. The contact measurement method is mainly the use of the rotor type flow meter, which is still a common instrument for flow measurement at home and abroad, and is often used as a benchmark for other flow measurement instruments. However, the long-term mechanical rotation of the rotor flowmeter is easy to be damaged. It needs to be calibrated regularly, and the cost is relatively high. . Non-contact online measurement metho...

AI Technical Summary

Problems solved by technology

[0004] However, in order to facilitate the determination of the area of ​​the rising bubble contour, the prior art usually uses a straight steel pipe, because as long as the starting point and the end point of the straight steel pipe are known, the position of each point in the water is determined. The position is affected by the water flow, and it is usually randomly curved. It is impossible to determine the underwater outlet position of the bubble, so that the area of ​​the rising bubble contour cannot be determined, and the flow rate cannot be measured. However, the existing technology can only be used for rivers with relatively flat river bottoms. For flow measurement, natural rivers are mostly rivers with complex cross-sections, and for wider rivers, steel pipes usually need to be spliced, and on-site construction is difficult, so the applicable range of the existing technology is small

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