Analysis of Internal Waves in the East/Japan Sea Using Small Perturbation Model and SAR

Title
Analysis of Internal Waves in the East/Japan Sea Using Small Perturbation Model and SAR
Author(s)
홍단비; 양찬수; Kazuo; 김태호
KIOST Author(s)
Yang, Chan Su(양찬수)
Alternative Author(s)
홍단비; 양찬수; Kazuo; 김태호
Publication Year
2014-08-01
Abstract
Synthetic Aperture Radar (SAR) has been proven to be a powerful sensor in the field of oceanography for the measurements of various oceanic phenomena such as surface and internal waves (IWs). Oceanic IWs are often generated in a stratified fluid by strong tidal flow in the ocean interior and propagated along a pycnocline where the water density changes rapidly retaining the waveform. Since microwave does not penetrate deep into water, it is not capable of directly imaging underwater phenomena, but the observed SAR images are manifestation of IWs through the changes of surface roughness induced by varying surface currents associated with IWs [1], [2]. In this study, the RADARSAT-1 C-band SAR image acquired on the 5th of July, 2000 was used to analyze IW signatures with a scattering model in the East/Japan Sea, known to be prone to generate IW during the summer season [3]. The backscattering radar cross section (RCS) per unit area of sea surface can be computed using the small perturbation model (SPM). The waveheight spectrum perturbed by a varying surface current field was considered and the interaction between IWs and the sea surface currents induced by the IWs was described by the action balance equation. From the preliminary experiment in the west coast of Korea, it is evident that the computed RCS variations were similar to those observed in the SAR image in the surface current changing region. We will apply the mfluid by strong tidal flow in the ocean interior and propagated along a pycnocline where the water density changes rapidly retaining the waveform. Since microwave does not penetrate deep into water, it is not capable of directly imaging underwater phenomena, but the observed SAR images are manifestation of IWs through the changes of surface roughness induced by varying surface currents associated with IWs [1], [2]. In this study, the RADARSAT-1 C-band SAR image acquired on the 5th of July, 2000 was used to analyze IW signatures with a scattering model in the East/Japan Sea, known to be prone to generate IW during the summer season [3]. The backscattering radar cross section (RCS) per unit area of sea surface can be computed using the small perturbation model (SPM). The waveheight spectrum perturbed by a varying surface current field was considered and the interaction between IWs and the sea surface currents induced by the IWs was described by the action balance equation. From the preliminary experiment in the west coast of Korea, it is evident that the computed RCS variations were similar to those observed in the SAR image in the surface current changing region. We will apply the m
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26080
Bibliographic Citation
2014 APNN-MAPWiST, pp.140, 2014
Publisher
2014
Type
Conference
Language
English
Publisher
2014
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