Application of Flow Measurement Method Based on Space-Time Image Recognition of River Surface

Space-time image velocimetry (STIV) is a time-averaged velocity measurement method which takes river surface images as the object of analysis, and detects the texture orientation of a generated space-time image to obtain the one-dimensional flow velocity. STIV method has special application potential in real-time monitoring of river surface velocity and cross-section discharge since it has the advantages of high spatial resolution, strong real-time performance, safety and convenience. Because this method is still in its infancy in China and the shortcomings of the current flow measurement methods, this study attempts to introduce STIV method to better serve the domestic hydrological measurement work. In order to verify the feasibility of the method and propose research needs, a comparative experiment was conducted in the Chongyang hydrological station with the impellor-type current meter. The result shows that the relative error of the flow velocity of STIV method was less than 16%. The feasibility of this method is preliminarily verified in this experiment.