SAR Imaging Features of Shallow Water Bathymetry

Purpose. The aim of the article is to study manifestations of the underwater topography features in the northern part of the White Sea in the images made by the spaceborn synthetic aperture radars (SAR) Sentinel-1A, Sentinel-1B. Methods and Results. In the SAR images, the bottom features are reveale...

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Published in:Morskoy gidrofizicheskiy zhurnal
Main Authors: Pivaev, P. D., Kudryavtsev, V. N., Balashova, E. A., Chapron, Bertrand
Format: Article in Journal/Newspaper
Language:English
Published: FSBSI MHI 2020
Subjects:
SAR
Online Access:https://archimer.ifremer.fr/doc/00648/75989/76890.pdf
https://archimer.ifremer.fr/doc/00648/75989/88417.pdf
https://doi.org/10.22449/0233-7584-2020-3-313-328
https://archimer.ifremer.fr/doc/00648/75989/
id ftarchimer:oai:archimer.ifremer.fr:75989
record_format openpolar
spelling ftarchimer:oai:archimer.ifremer.fr:75989 2023-05-15T18:43:54+02:00 SAR Imaging Features of Shallow Water Bathymetry Особенности проявления донной топографии на спутниковых РСА-изображениях Pivaev, P. D. Kudryavtsev, V. N. Balashova, E. A. Chapron, Bertrand 2020 application/pdf https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf https://doi.org/10.22449/0233-7584-2020-3-313-328 https://archimer.ifremer.fr/doc/00648/75989/ eng eng FSBSI MHI https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf doi:10.22449/0233-7584-2020-3-313-328 https://archimer.ifremer.fr/doc/00648/75989/ info:eu-repo/semantics/openAccess restricted use Physical Oceanography (0928-5105) (FSBSI MHI), 2020 , Vol. 27 , N. 3 , P. 290-304 bottom topography Sentinel-1 SAR wave breaking current divergence text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.22449/0233-7584-2020-3-313-328 2021-09-23T20:35:51Z Purpose. The aim of the article is to study manifestations of the underwater topography features in the northern part of the White Sea in the images made by the spaceborn synthetic aperture radars (SAR) Sentinel-1A, Sentinel-1B. Methods and Results. In the SAR images, the bottom features are revealed as bright and dark brightness anomalies. The anomalies were observed at the wind speed ranging from 2.6 to 10.8 m/s, and became reverse (bright anomalies turned dark and vice versa), when a tidal current changed its direction. It is shown that the observed SAR imagery contrasts correlate to divergence of a current formed by interaction of a tidal flow with the bottom topography inhomogeneities. The simulated SAR contrasts agree with the observations, and confirm the relation between the observed SAR contrasts and the current divergence. Together with modeling the SAR contrasts, the contribution of different mechanisms to formation of the observed modulations of the normalized radar cross section was qualitatively estimated. The wave breaking effect was especially accentuated. The method for retrieving the underwater bottom topography based on the relationship between the bottom gradient and the SAR imagery contrasts is proposed. Conclusions. Location of the bottom inhomogeneities in the shallow water region on the whole coincides with that of the tidal current divergence and convergence zones, which are observed as brightness anomalies in the SAR images. Breaking of surface waves is the main contributor to the observed SAR contrasts. The bottom topography reconstructed from the SAR contrasts, and the actual one resulted from the bathymetry maps are in good agreement. Some discrepancies are interpreted as possible changes in depth and shape of the bottom topography features induced by action of strong currents and waves. Article in Journal/Newspaper White Sea Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) White Sea Morskoy gidrofizicheskiy zhurnal 36 3
institution Open Polar
collection Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
op_collection_id ftarchimer
language English
topic bottom topography
Sentinel-1
SAR
wave breaking
current divergence
spellingShingle bottom topography
Sentinel-1
SAR
wave breaking
current divergence
Pivaev, P. D.
Kudryavtsev, V. N.
Balashova, E. A.
Chapron, Bertrand
SAR Imaging Features of Shallow Water Bathymetry
topic_facet bottom topography
Sentinel-1
SAR
wave breaking
current divergence
description Purpose. The aim of the article is to study manifestations of the underwater topography features in the northern part of the White Sea in the images made by the spaceborn synthetic aperture radars (SAR) Sentinel-1A, Sentinel-1B. Methods and Results. In the SAR images, the bottom features are revealed as bright and dark brightness anomalies. The anomalies were observed at the wind speed ranging from 2.6 to 10.8 m/s, and became reverse (bright anomalies turned dark and vice versa), when a tidal current changed its direction. It is shown that the observed SAR imagery contrasts correlate to divergence of a current formed by interaction of a tidal flow with the bottom topography inhomogeneities. The simulated SAR contrasts agree with the observations, and confirm the relation between the observed SAR contrasts and the current divergence. Together with modeling the SAR contrasts, the contribution of different mechanisms to formation of the observed modulations of the normalized radar cross section was qualitatively estimated. The wave breaking effect was especially accentuated. The method for retrieving the underwater bottom topography based on the relationship between the bottom gradient and the SAR imagery contrasts is proposed. Conclusions. Location of the bottom inhomogeneities in the shallow water region on the whole coincides with that of the tidal current divergence and convergence zones, which are observed as brightness anomalies in the SAR images. Breaking of surface waves is the main contributor to the observed SAR contrasts. The bottom topography reconstructed from the SAR contrasts, and the actual one resulted from the bathymetry maps are in good agreement. Some discrepancies are interpreted as possible changes in depth and shape of the bottom topography features induced by action of strong currents and waves.
format Article in Journal/Newspaper
author Pivaev, P. D.
Kudryavtsev, V. N.
Balashova, E. A.
Chapron, Bertrand
author_facet Pivaev, P. D.
Kudryavtsev, V. N.
Balashova, E. A.
Chapron, Bertrand
author_sort Pivaev, P. D.
title SAR Imaging Features of Shallow Water Bathymetry
title_short SAR Imaging Features of Shallow Water Bathymetry
title_full SAR Imaging Features of Shallow Water Bathymetry
title_fullStr SAR Imaging Features of Shallow Water Bathymetry
title_full_unstemmed SAR Imaging Features of Shallow Water Bathymetry
title_sort sar imaging features of shallow water bathymetry
publisher FSBSI MHI
publishDate 2020
url https://archimer.ifremer.fr/doc/00648/75989/76890.pdf
https://archimer.ifremer.fr/doc/00648/75989/88417.pdf
https://doi.org/10.22449/0233-7584-2020-3-313-328
https://archimer.ifremer.fr/doc/00648/75989/
geographic White Sea
geographic_facet White Sea
genre White Sea
genre_facet White Sea
op_source Physical Oceanography (0928-5105) (FSBSI MHI), 2020 , Vol. 27 , N. 3 , P. 290-304
op_relation https://archimer.ifremer.fr/doc/00648/75989/76890.pdf
https://archimer.ifremer.fr/doc/00648/75989/88417.pdf
doi:10.22449/0233-7584-2020-3-313-328
https://archimer.ifremer.fr/doc/00648/75989/
op_rights info:eu-repo/semantics/openAccess
restricted use
op_doi https://doi.org/10.22449/0233-7584-2020-3-313-328
container_title Morskoy gidrofizicheskiy zhurnal
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