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Sea level at the co...
Sea level at the coast from video-sensed waves : Comparison to tidal gauges and satellite altimetry
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- Abessolo Ondoa, Gregoire (author)
- University of Toulouse,University of Douala
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- Almar, R. (author)
- University of Toulouse
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- Castelle, B. (author)
- University of Bordeaux
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- Testut, L. (author)
- University of La Rochelle,University of Toulouse
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- Léger, F. (author)
- University of Toulouse
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- Sohou, Z. (author)
- Centre de Recherches Halieutiques et Océanologiques du Bénin
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- Bonou, F. (author)
- Centre de Recherches Halieutiques et Océanologiques du Bénin,Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques
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- Bergsma, E. W.J. (author)
- University of Toulouse
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- Meyssignac, B. (author)
- University of Toulouse
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- Larson, M. (author)
- Lund University,Lunds universitet,Avdelningen för Teknisk vattenresurslära,Institutionen för bygg- och miljöteknologi,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Water Resources Engineering,Department of Building and Environmental Technology,Departments at LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- 2019
- 2019
- English 13 s.
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In: Journal of Atmospheric and Oceanic Technology. - 0739-0572. ; 36:8, s. 1591-1603
- Related links:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
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- Nearshore complex and energetic hydrodynamic conditions make observing evolving processes during extreme and short-term events difficult. In particular, total sea levels at the coast are hard to measure with current techniques. Sea level is commonly measured with tidal gauges and spaceborne altimetry, which lack essential details of spatial and wave-related sea level variability along the coast. Hence, novel techniques, adapted to nearshore areas, are required. This paper presents the first-time use of video cameras to derive the total sea level at the coast. This novel approach consists of estimating time-varying total water levels by applying a celerity-based depth inversion method, which is conventionally used to estimate bathymetry from video. The video-derived total sea levels are compared to sea levels derived from an in situ acoustic Doppler current profiler (ADCP), the nearest tide gauge, and altimetry. A tidal harmonic analysis is performed on the video-derived water levels, yielding an accurate determination of the dominant tidal harmonics. However, it remains difficult to separate bathymetric changes due to the waves on beaches when rapid morphological changes occur under energetic conditions. Nonetheless, video-derived water-level anomalies are in good agreement with state-of-the-art altimetry products. Although there is still work to be done, the results show the potential to measure total sea level at the coast using video camera systems.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Abessolo Ondoa, ...
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Almar, R.
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Castelle, B.
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Testut, L.
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Léger, F.
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Sohou, Z.
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show more...
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Bonou, F.
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Bergsma, E. W.J.
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Meyssignac, B.
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Larson, M.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Oceanography Hyd ...
- Articles in the publication
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Journal of Atmos ...
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Lund University