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Video-based detection of shorelines at complex mesomacro tidal beaches

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Show simple item record Almar, R. Ranasinghe, R. Snchal, N. Bonneton, P. Roelvink, D. Bryan, Karin R. Marieu, V. Parisot, J-P. 2012-10-11T23:04:58Z 2012-10-11T23:04:58Z 2012
dc.identifier.citation Almar, R., Ranasinghe, R., Snchal, N., Bonneton, P., Roelvink, D., Bryan, K.R., Marieu, V., & Parisot, J-P. (2012). Video-based detection of shorelines at complex mesomacro tidal beaches. Journal of Coastal Research, 28(5), 1040-1048. en_NZ
dc.identifier.issn 0749-0208
dc.description.abstract Remote video imagery is widely used to acquire measurements of intertidal topography by means of shoreline detection, but, up to now, problems of accuracy were still encountered in the challenging case of energetic waves in nonuniform, mesomacro tidal environments. Unique, simultaneous, video-based and global positioning system (GPS)based measurements of shoreline were undertaken at Truc Vert (France), a beach with such characteristics. An innovative video method, referred to herein as the Minimum Shoreline Variability (MSV) method, was developed to cope with highly variable spatiotemporal shoreline properties. The comparison of video-based and GPS-derived shoreline data sets showed that using images averaged over short periods (30 s), rather than the traditionally used 10-min averaged images, significantly improved the accuracy of shoreline determination. A local video-derived, swash-based shoreline correction was also developed to correct for the MSV error, which was found to be linearly correlated to local swash length. By combining shorter time-averaged images and video derived local swash correction factors, the horizontal root mean square error associated with MSV shorelines was reduced to 1.2 m, which is equivalent to errors reported at more uniform, microtidal, and less-energetic beaches. en_NZ
dc.language.iso en
dc.publisher Coastal Education and Research Foundation (CERF) en_NZ
dc.subject intertidal beach morphology en_NZ
dc.subject mesoamacro tidal environment en_NZ
dc.subject shoreline en_NZ
dc.subject swash en_NZ
dc.subject Truc Vert beach en_NZ
dc.subject Video imaging en_NZ
dc.title Video-based detection of shorelines at complex mesomacro tidal beaches en_NZ
dc.type Journal Article en_NZ
dc.identifier.doi 10.2112/JCOASTRES-D-10-00149.1 en_NZ

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