Next Article in Journal
Reconstruction of Daily Sea Surface Temperature Based on Radial Basis Function Networks
Previous Article in Journal
Satellite and Ground Observations of Snow Cover in Tibet during 2001–2015
Previous Article in Special Issue
Detection of Bivalve Beds on Exposed Intertidal Flats Using Polarimetric SAR Indicators

Mechanisms of SAR Imaging of Shallow Water Topography of the Subei Bank

College of Oceanography, Hohai University, Nanjing 210098, China
Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, USA
GST, NESDIS/NOAA, College Park, MD 20740, USA
Author to whom correspondence should be addressed.
Remote Sens. 2017, 9(11), 1203;
Received: 27 September 2017 / Revised: 12 November 2017 / Accepted: 20 November 2017 / Published: 22 November 2017
(This article belongs to the Special Issue Ocean Remote Sensing with Synthetic Aperture Radar)
In this study, the C-band radar backscatter features of the shallow water topography of Subei Bank in the Southern Yellow Sea are statistically investigated using 25 ENVISAT (Environmental Satellite) ASAR (advanced synthetic aperture radar) and ERS-2 (European Remote-Sensing Satellite-2) SAR images acquired between 2006 and 2010. Different bathymetric features are found on SAR imagery under different sea states. Under low to moderate wind speeds (3.1~6.3 m/s), the wide bright patterns with an average width of 6 km are shown and correspond to sea surface imprints of tidal channels formed by two adjacent sand ridges, while the sand ridges appear as narrower (only 1 km wide), fingerlike, quasi-linear features on SAR imagery in high winds (5.4~13.9 m/s). Two possible SAR imaging mechanisms of coastal bathymetry are proposed in the case where the flow is parallel to the major axes of tidal channels or sand ridges. When the surface Ekman current is opposite to the mean tidal flow, two vortexes will converge at the central line of the tidal channel in the upper layer and form a convergent zone over the sea surface. Thus, the tidal channels are shown as wide and bright stripes on SAR imagery. For the SAR imaging of sand ridges, all the SAR images were acquired at low tidal levels. In this case, the ocean surface waves are possibly broken up under strong winds when propagating from deep water to the shallower water, which leads to an increase of surface roughness over the sand ridges. View Full-Text
Keywords: SAR; Subei Bank; shallow water topography SAR; Subei Bank; shallow water topography
Show Figures

Graphical abstract

MDPI and ACS Style

Zhang, S.; Xu, Q.; Zheng, Q.; Li, X. Mechanisms of SAR Imaging of Shallow Water Topography of the Subei Bank. Remote Sens. 2017, 9, 1203.

AMA Style

Zhang S, Xu Q, Zheng Q, Li X. Mechanisms of SAR Imaging of Shallow Water Topography of the Subei Bank. Remote Sensing. 2017; 9(11):1203.

Chicago/Turabian Style

Zhang, Shuangshang; Xu, Qing; Zheng, Quanan; Li, Xiaofeng. 2017. "Mechanisms of SAR Imaging of Shallow Water Topography of the Subei Bank" Remote Sens. 9, no. 11: 1203.

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop