A thin-layer water flow rolling wave measurement system and method based on high-definition photography

Abstract

The invention relates to a thin current rolling wave measurement system and method based on high-definition photographing, and the system comprises a slope surface which water passes by. The slope surface is provided with a high-definition digital image capturer which automatically records time. The part, in the photographing view field of the high-definition digital image capturer, of the slope surface is provided with a positioning mark. The high-definition digital image capturer is sequentially connected with a rolling wave recognizer, an image corrector, and a rolling wave parameter calculation controller which is connected with the high-definition digital image capturer. The system employs the high-definition digital image capturer, continuously captures the image of a high-speed moving rolling wave, analyzes a rolling wave in the image through employing the technology of digital image analysis, and obtains all feature parameters of the rolling wave. Because the obtaining, calibration and calculation are completed through a computer, the system, compared with a conventional system, can set a plurality of points in an observation region, can carry out testing and observation at the same time, is wide in view field, and can well solve a problem of the observation of the flowing speed of a thin current in a larger area.

Description

technical field [0001] The present invention relates to a thin-layer water flow rolling wave measurement system and method based on high-definition photography. Experimental system and method for hydraulic measurement of rolling wave characteristic parameters in flow process. Background technique [0002] Under certain critical conditions, such as slope surface water flow and constant and uniform open channel water flow, the surface will often become unstable and develop a series of fluctuation processes. These fluctuations may be periodic, and the wave speed and wave shape remain unchanged, and the wave speed is always greater than the movement speed of water flow particles; Fragmentation eventually occurs. These phenomena are collectively referred to as roll. Rolling waves are often found on natural slopes, urban roads, steep discharge channels of hydropower stations, spillways of dams, floodways of rivers, and aqueducts. The emergence of rolling waves will bring a ser...

AI Technical Summary

Problems solved by technology

The existing observation is to use the hydrological probe to observe directly. This method mainly determines the relative position of the probe and the rolling wave manually. Because it is a manual visual measurement, and the rolling wave changes very fast, the human visual inspection often cannot meet the requirements. Some effects, the measurement is difficult to guarantee the accuracy, due to artificial measurement, its stability is poor, each measurement result is not the same, can only increase the number of measurements, and use statistical methods to obtain approximate measurements

This method makes rolling wave measurement a complicated manual labor that needs to be repeated many times. As the physical strength of the person declines, its accuracy becomes worse and worse.

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