Riverway bubble vortex structure identifying and tracking method and navigation early warning method
A technology of structure identification and river channel, applied in the field of shipping and traffic, which can solve the problems of inability to provide data support for early warning of navigation and current state, transient motion of difficult-to-bubble swirling structures, etc.
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[0072] The optimal implementation mode: if figure 1 As shown, a method for identifying and tracking channel bubble swirl structure includes the following steps:
[0073] 1) The image data of the river surface is collected by the camera, and the acquired river surface flow state image is preprocessed. The single-frame velocity field is used to remove the average flow characteristics to obtain a single-frame pulsating velocity field that can reflect the outward expansion of the bubble vortex.
[0074] 2) Determine the position of the center of the current bubble vortex through the divergence characteristics of the single-frame pulsating velocity field; that is, introduce the two-dimensional divergence as an index to locate the center of the bubble vortex:
[0075]
[0076] In the formula: is the divergence value at the water surface (x, y); F x is the velocity component of the point (x, y) along the x direction; F y is the velocity component of the point (x, y) along the ...
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