Sea level at the coast from video-sensed waves : Comparison to tidal gauges and satellite altimetry
(2019) In Journal of Atmospheric and Oceanic Technology 36(8). p.1591-1603- Abstract
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... (More)
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.
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- author
- Abessolo Ondoa, Gregoire ; Almar, R. ; Castelle, B. ; Testut, L. ; Léger, F. ; Sohou, Z. ; Bonou, F. ; Bergsma, E. W.J. ; Meyssignac, B. and Larson, M. LU
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Atmospheric and Oceanic Technology
- volume
- 36
- issue
- 8
- pages
- 13 pages
- publisher
- American Meteorological Society
- external identifiers
-
- scopus:85075333138
- ISSN
- 0739-0572
- DOI
- 10.1175/JTECH-D-18-0203.1
- language
- English
- LU publication?
- yes
- id
- 955b7188-8a3e-4aba-98f3-f87dc2bda0c8
- date added to LUP
- 2019-12-11 09:28:14
- date last changed
- 2022-04-18 19:22:57
@article{955b7188-8a3e-4aba-98f3-f87dc2bda0c8,
abstract = {{<p>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.</p>}},
author = {{Abessolo Ondoa, Gregoire and Almar, R. and Castelle, B. and Testut, L. and Léger, F. and Sohou, Z. and Bonou, F. and Bergsma, E. W.J. and Meyssignac, B. and Larson, M.}},
issn = {{0739-0572}},
language = {{eng}},
number = {{8}},
pages = {{1591--1603}},
publisher = {{American Meteorological Society}},
series = {{Journal of Atmospheric and Oceanic Technology}},
title = {{Sea level at the coast from video-sensed waves : Comparison to tidal gauges and satellite altimetry}},
url = {{http://dx.doi.org/10.1175/JTECH-D-18-0203.1}},
doi = {{10.1175/JTECH-D-18-0203.1}},
volume = {{36}},
year = {{2019}},
}