Nearshore Wave Measurement Using Single-Video Images of Buoy Motions

This paper presents a wave measurement technique based on single-video monitoring of moored buoys. A simple photogrammetry is proposed, with a constraint that the distance from video camera to buoy should be predetermined. The distance is approximated to a constant under the condition that it is muc...

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Bibliographic Details
Published in:Journal of coastal research 2008-11, Vol.24 (6), p.1481-1486
Main Authors: Kim, Baeck Oon, Cho, Hong Yeon, Lim, Dhong Il, Yoon, Gil Lim, Oh, Im Sang, Park, Yong Ahn
Format: Article
Language:English
Subjects:
Approximation
buoy motion
Buoys
Cameras
Coastal environments
Coordinate systems
Economics
Grounds
Image processing
Marine
Monitoring
Mooring buoys
Photogrammetry
Pressure gages
Pressure gauges
Research universities
Video cameras
video monitoring
wave measurement
Waves
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Summary:This paper presents a wave measurement technique based on single-video monitoring of moored buoys. A simple photogrammetry is proposed, with a constraint that the distance from video camera to buoy should be predetermined. The distance is approximated to a constant under the condition that it is much greater than the range of the buoy motion. Image coordinates of a buoy are mapped onto a spherical surface without significant errors in vertical ground coordinates. Wave characteristics are comparable to those from a bottom pressure gauge, indicating that the video technique has the potential to remotely measure waves in coastal environments. We anticipate our finding to be a starting point for an economic instrument of wave measurement through development of an automated image processing technique.
ISSN:0749-0208
1551-5036
DOI:10.2112/07-0850.1