Underwater topography detection of Taiwan Shoal with SAR images

Jungang Yang; Jie Zhang; Junmin Meng

doi:10.1007/s00343-010-9070-x

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Underwater topography detection of Taiwan Shoal with SAR images

Updated：2023-05-16

- Underwater topography detection of Taiwan Shoal with SAR images
- Journal of Oceanology and Limnology Vol. 28, Issue 3, Pages: 636-642(2010)
- Affiliations：
  
  1. The First Institute of Oceanography State Oceanic Administration (SOA)
  2. Key Laboratory of Marine Science and Numerical Modeling (MASNUM) State Oceanic Administration (SOA)
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9070-x
  CLC：
- Online First：20 May 2010，
  
  Published：2010
- Accepted：
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Yang, J., Zhang, J. & Meng, J. Underwater topography detection of Taiwan Shoal with SAR images., Chin. J. Ocean. Limnol. 28, 636–642 (2010). https://doi.org/10.1007/s00343-010-9070-x
DOI：

Yang, J., Zhang, J. & Meng, J. Underwater topography detection of Taiwan Shoal with SAR images., Chin. J. Ocean. Limnol. 28, 636–642 (2010). https://doi.org/10.1007/s00343-010-9070-x DOI：

摘要

Abstract

Under suitable conditions of tidal current and wind

underwater topography can be detected by synthetic aperture radar (SAR) indirectly. Underwater topography SAR imaging includes three physical processes: radar ocean surface backscattering

the modulation of sea surface short wave spectrum by the variations in sea surface currents

and the modulation of sea surface currents by the underwater topography. The first process is described usually by Bragg scattering theory because the incident angle of SAR is always between 20°–70°. The second process is described by the action balance equation. The third process is described by an ocean hydrodynamic model. Based on the SAR imaging mechanism for underwater topography

an underwater topography SAR detection model and a simplified method for its calculation are introduced. In the detection model

a two-dimensional hydrodynamic model — the shallow water model is used to describe the motion of tidal current. Due to the difficulty of determining the expression of SAR backscattering cross section in which some terms can not be determined

the backscattering cross section of SAR image used in the underwater topography SAR detection is pro-processed by the simulated SAR image of the coarse-grid water depth to simplify the calculation. Taiwan Shoal

located at the southwest outlet of Taiwan Strait

is selected as an evaluation area for this technique due to the occurrence of hundreds of sand waves. The underwater topography of Taiwan Shoal was detected by two scenes of ERS-2 SAR images which were acquired on 9 January 2000 and 6 June 2004. The detection results are compared with in situ measured water depths for three profiles. The average absolute and relative errors of the best detection result are 2.23 m and 7.5 %

respectively. These show that the detection model and the simplified method introduced in the paper is feasible.

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Keywords

references

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