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.

Active Publication Date: 2020-09-15
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology

[0004] At present, the acoustic Doppler current meter, optical radar and other equipment commonly used in the prototype observation of natural rivers are difficult to directly measure the transient state of t

Method used

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  • Riverway bubble vortex structure identifying and tracking method and navigation early warning method
  • Riverway bubble vortex structure identifying and tracking method and navigation early warning method
  • Riverway bubble vortex structure identifying and tracking method and navigation early warning method

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Embodiment approach

[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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Abstract

The invention discloses a riverway bubble vortex structure identifying method, which comprises the following steps: 1) acquiring image data of a riverway water surface through a camera, performing preprocessing and calculating a single-frame pulse velocity field of the water surface; 2) determining a current bubble vortex center position according to divergence characteristics of the single-framepulse speed field; and 3) filtering the divergence field of the bubble vortex region by adopting a standardized bubble vortex velocity field template, and selecting a proper threshold to extract the bubble vortex region to obtain a current bubble vortex edge range. The invention also discloses a riverway bubble vortex structure identifying and tracking method based on the identifying method, and ariverway navigation early warning method. The method can be well applied to large-scale natural river bubble vortex structure identifying and tracking calculation, so that the process convenience andhigh efficiency of bubble vortex structure measurement and analysis are improved, the motion and distribution of the bubble vortex flow state hindering navigation in a river channel can be rapidly obtained, and a powerful support is provided for ship route planning and safe navigation.

Description

technical field [0001] The invention relates to the technical field of shipping and transportation, in particular to a method for identifying and tracking a swirl structure in a river channel and a navigation early warning method. Background technique [0002] The channel bubble whirlpool refers to the strong cylindrical upwelling flow and funnel-shaped vertical axis circulation formed under special conditions in the channel. In the valleys of natural rivers and deep troughs under rapids, bubble vortex structures are often produced due to drastic changes in riverbed topography or excessive vertical gradients, and this is even worse during the flood season. This complex flow structure caused by water flow turbulence has the characteristics of instantaneousness on the time scale and uncertainty on the space scale. Rolling, ramming and sinking of ships. It is extremely difficult to operate in such a flow state during the ship's navigation, and the driver needs to pay special ...

Claims

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Application Information

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IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 杨胜发金健灵张鹏胡江李文杰肖毅杨威王丽刘旭晖
Owner CHONGQING JIAOTONG UNIVERSITY
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