Особенности проявления донной топографии на спутниковых РСА-изображениях
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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fttriple:oai:gotriple.eu:10670/1.fzgh7k 2023-05-15T18:43:55+02:00 Особенности проявления донной топографии на спутниковых РСА-изображениях SAR Imaging Features of Shallow Water Bathymetry Pivaev, P. D. Kudryavtsev, V. N. Balashova, E. A. Chapron, Bertrand 2020-01-01 https://doi.org/10.22449/0233-7584-2020-3-313-328 https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf https://archimer.ifremer.fr/doc/00648/75989/ en eng FSBSI MHI doi:10.22449/0233-7584-2020-3-313-328 10670/1.fzgh7k https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf https://archimer.ifremer.fr/doc/00648/75989/ other Archimer, archive institutionnelle de l'Ifremer Physical Oceanography (0928-5105) (FSBSI MHI), 2020 , Vol. 27 , N. 3 , P. 290-304 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2020 fttriple https://doi.org/10.22449/0233-7584-2020-3-313-328 2023-01-22T17:30:17Z 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. Text White Sea Unknown White Sea Morskoy gidrofizicheskiy zhurnal 36 3 |
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English |
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geo envir Pivaev, P. D. Kudryavtsev, V. N. Balashova, E. A. Chapron, Bertrand Особенности проявления донной топографии на спутниковых РСА-изображениях |
topic_facet |
geo envir |
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 |
Text |
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 |
Особенности проявления донной топографии на спутниковых РСА-изображениях |
title_short |
Особенности проявления донной топографии на спутниковых РСА-изображениях |
title_full |
Особенности проявления донной топографии на спутниковых РСА-изображениях |
title_fullStr |
Особенности проявления донной топографии на спутниковых РСА-изображениях |
title_full_unstemmed |
Особенности проявления донной топографии на спутниковых РСА-изображениях |
title_sort |
особенности проявления донной топографии на спутниковых рса-изображениях |
publisher |
FSBSI MHI |
publishDate |
2020 |
url |
https://doi.org/10.22449/0233-7584-2020-3-313-328 https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf https://archimer.ifremer.fr/doc/00648/75989/ |
geographic |
White Sea |
geographic_facet |
White Sea |
genre |
White Sea |
genre_facet |
White Sea |
op_source |
Archimer, archive institutionnelle de l'Ifremer Physical Oceanography (0928-5105) (FSBSI MHI), 2020 , Vol. 27 , N. 3 , P. 290-304 |
op_relation |
doi:10.22449/0233-7584-2020-3-313-328 10670/1.fzgh7k https://archimer.ifremer.fr/doc/00648/75989/76890.pdf https://archimer.ifremer.fr/doc/00648/75989/88417.pdf https://archimer.ifremer.fr/doc/00648/75989/ |
op_rights |
other |
op_doi |
https://doi.org/10.22449/0233-7584-2020-3-313-328 |
container_title |
Morskoy gidrofizicheskiy zhurnal |
container_volume |
36 |
container_issue |
3 |
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1766234446676099072 |