LiDAR Validation of a Video-Derived Beachface Topography on a Tidal Flat

Type Article
Date 2017-08
Language English
Author(s) Didier David1, Bernatchez Pascal1, Augereau Emmanuel2, Caulet Charles2, Dumont DanyORCID3, Bismuth Eliott1, Cormier Louis1, Floc'h France2, Delacourt Christophe2
Affiliation(s) 1 : Univ Quebec Rimouski, Quebec Ocean, Ctr Etud Nord, Chaire Rech Geosci Cotiere, Rimouski, PQ G5L 3A1, Canada.
2 : Univ Bretagne Occidentale, Inst Univ Europeen mer, UMR 6538, Lab Geosci Ocean, F-29280 Plouzane, France.
3 : Univ Quebec Rimouski, Inst Sci Mer Rimouski, Quebec Ocean, Phys Oceans Lab Rimouski, Rimouski, PQ G5L 3A1, Canada.
Source Remote Sensing (2072-4292) (Mdpi), 2017-08 , Vol. 9 , N. 8 , P. 826 (22p.)
DOI 10.3390/rs9080826
WOS© Times Cited 9
Keyword(s) video monitoring, shoreline detection, beach morphology, mobile terrestrial LiDAR, erosion, Atlantic Canada
Abstract

Increasingly used shore-based video stations enable a high spatiotemporal frequency analysis of shoreline migration. Shoreline detection techniques combined with hydrodynamic conditions enable the creation of digital elevation models (DEMs). However, shoreline elevations are often estimated based on nearshore process empirical equations leading to uncertainties in video-based topography. To achieve high DEM correspondence between both techniques, we assessed video-derived DEMs against LiDAR surveys during low energy conditions. A newly installed video system on a tidal flat in the St. Lawrence Estuary, Atlantic Canada, served as a test case. Shorelines were automatically detected from time-averaged (TIMEX) images using color ratios in low energy conditions synchronously with mobile terrestrial LiDAR during two different surveys. Hydrodynamic (waves and tides) data were recorded in-situ, and established two different cases of water elevation models as a basis for shoreline elevations. DEMs were created and tested against LiDAR. Statistical analysis of shoreline elevations and migrations were made, and morphological variability was assessed between both surveys. Results indicate that the best shoreline elevation model includes both the significant wave height and the mean water level. Low energy conditions and in-situ hydrodynamic measurements made it possible to produce video-derived DEMs virtually as accurate as a LiDAR product, and therefore make an effective tool for coastal managers.

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Didier David, Bernatchez Pascal, Augereau Emmanuel, Caulet Charles, Dumont Dany, Bismuth Eliott, Cormier Louis, Floc'h France, Delacourt Christophe (2017). LiDAR Validation of a Video-Derived Beachface Topography on a Tidal Flat. Remote Sensing, 9(8), 826 (22p.). Publisher's official version : https://doi.org/10.3390/rs9080826 , Open Access version : https://archimer.ifremer.fr/doc/00638/75022/