Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images

Sun Jian; Guan Changlong

doi:10.1007/BF02842769

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Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images

Updated：2023-05-16

- Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images
- Journal of Oceanology and Limnology Vol. 24, Issue 1, Pages: 12-20(2006)
- Affiliations：
  
  Physical Oceamography Laboratory Ocean University of China
- Author bio：
- Funds：
- DOI：10.1007/BF02842769
  CLC：
- Published：2006
- Accepted：
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Jian, S., Changlong, G. Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images., Chin. J. Ocean. Limnol. 24, 12–20 (2006). https://doi.org/10.1007/BF02842769
DOI：

Jian, S., Changlong, G. Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images., Chin. J. Ocean. Limnol. 24, 12–20 (2006). https://doi.org/10.1007/BF02842769 DOI：

摘要

Abstract

A method to retrieve ocean wave spectra from SAR images

named Parameterized First-guess Spectrum Method (PFSM)

was proposed after interpretation of the theory to ocean wave imaging and analysis of the drawbacks of the retrieving model generally used. In this method

with additional information and satellite parameters

the separating wave-number is first calculated to determine the maximum wave-number beyond which the linear relation can be used. The separating wave-number can be calculated using the additional information on wind velocity and parameters of SAR satellite. And then the SAR spectrum can be divided into SAR spectrum of wind wave and of swell according to the result of separating wave-number. The portion of SAR spectrum generated by wind wave

is used to search for the most suitable parameters of ocean wind wave spectrum

including propagation direction of ocean wave

phase speed of dominating wave and the angle spreading coefficient. The swell spectrum is acquired by directly inversing the linear relation of ocean wave spectrum to SAR spectrum given the portion of SAR spectrum generated by swell. We used the proposed method to retrieve the ocean wave spectrum from ERS-SAR data from the South China Sea and compared the result with altimeter data. The agreement indicates that the PFSM is reliable.

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Keywords

references

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Physical Oceanography Laboratory Ocean University of China

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