FN Archimer Export Format
PT J
TI SAR Imaging Features of Shallow Water Bathymetry
TI Особенности проявления донной топографии на спутниковых РСА-изображениях
BT 
AF Pivaev, P. D.
   Kudryavtsev, V. N.
   Balashova, E. A.
   Chapron, Bertrand
AS 1:1;2:1,2;3:1;4:1,3;
FF 1:;2:;3:;4:PDG-ODE-LOPS-SIAM;
C1 Russian State Hydrometeorological University, Saint-Petersburg, Russia
   Marine Hydrophisical Institute, Russian Academy of Sciences, Sevastopol, Russia
   Institute Francais de Recherche pour I’Exploitation de la Mer, Plouzane, France
C2 UNIV RUSSIAN STATE HYDROMETEOROL, RUSSIA
   RUSSIAN ACAD SCI, RUSSIA
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer UMR
   DOAJ
   copubli-int-hors-europe
TC 0
UR https://archimer.ifremer.fr/doc/00648/75989/76890.pdf
   https://archimer.ifremer.fr/doc/00648/75989/88417.pdf
LA English
   Other
DT Article
DE ;bottom topography;Sentinel-1;SAR;wave breaking;current divergence
AB 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. 
PY 2020
SO Physical Oceanography
SN 0928-5105
PU FSBSI MHI
VL 27
IS 3
UT 000561758200006
BP 290
EP 304
DI 10.22449/0233-7584-2020-3-313-328
ID 75989
ER

EF