Method for implementing online tests of stream flow based on video images

Abstract

The invention discloses a method for implementing online tests of stream flow based on video images, and belongs to the technical field of non-contact open channel flow measurement. The method relates to a water flow tracing system, a water surface illuminating system, a video flow acquisition system, a camera calibrating system, an image processing system and a flow estimating system, trace particles are thrown in a flow measuring stream segment by the water flow tracing system, a camera shoots a water surface video stream, frames are extracted at fixed intervals and are processed digitally, the image processing system processes digital images according to ground control point coordinate information provided by the camera calibrating system, and finally, the stream flow is computed by the aid of the flow estimating system according to a flow rate and area method. By the aid of the method, complicity of stream flow measurement is reduced, simultaneously, high measurement precision can be guaranteed, and the stream flow can be dynamically monitored in extreme environments.

Description

technical field [0001] The invention relates to a river flow measurement method, in particular to a method for realizing an online river flow measurement based on a video image, and belongs to the technical field of non-contact open channel flow measurement. Background technique [0002] With the increase of industrial and agricultural production and domestic water consumption, the contradiction between supply and demand of water resources has become increasingly acute, leading to frequent occurrence of river cut-offs and water pollution disasters, which have had many adverse effects on the economy, residents' lives and ecological environment along the river. At the same time, the long-term monitoring of sewage flow is also a difficult task. Due to the harsh environment of the sewage channel, its high humidity, many sundries, and possibly corrosive gases and liquids will bring danger to equipment and operators. Therefore, flow testing instruments are required to be able to ...

AI Technical Summary

Problems solved by technology

[0009] It can be seen that the existing flow measurement methods are inherently deficient in principle. Due to the influence of the flow state and environmental complexity under field conditions, as well as the limitations of technical and economic factors, there are many inaccuracies and uncertainties in the current real-time monitoring of river flow. question

Especially in extreme high-velocity environments such as floods, embankment breaks, and dam closures, and for large-scale river flow tests with extremely low flow rates and large passing areas, there is currently no effective test method

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