| 講演名 | 2013-12-02 Velocity Measurement of Internal Waves in the South China Sea by Multi-Temporal and Multi-Sensor Satellite Images(ICSANE 2013(International Conference on Space, Aeronautical and Navigational Electronics) , |
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| 抄録(英) | Oceanic internal waves are generated at the boundary of stratified water layers of different densities associated with salinity and/or temperature. They are often generated by the interaction between the bottom topography and tidal currents. As internal waves propagate the water particles are pushed upward and pulled downward by the stratified boundary, yielding varying surface currents, and these currents move in phase with the internal waves. The varying surface currents produce rough and smooth zones of sea surface, and these differences in surface roughness can be detected by optical imagers and synthetic aperture radars (SARs). In this study, MODIS/Terra and ENVISAT/ASAR were used to obtain sequential images of internal waves in the South China Sea for estimating the propagation properties of internal waves. Most of internal waves in the South China Sea were propagating westward due to strong currents of the Kuroshio. The phase velocities of these internal waves were measured by two methods using; 1) multi-temporal and multi-sensor images acquired in a very short time interval, 2) several packets of internal waves associated with semidiurnal tidal period in a single image. The internal wave velocities estimated by the method 1 ranged from 0.84 m/s to 1.91 m/s depending on the water depth, while those by the method 2 were from 0.37 m/s to 0.59 m/s. It was found that the velocity difference between two methods is up to 1.40 m/s and the phase velocity decreases with decreasing water depth. |
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| キーワード(英) | Internal waves / Phase velocity / SAR / MODIS |
| 資料番号 | SANE2013-85 |
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| 研究会 | SANE |
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| 開催期間 | 2013/11/25(から1日開催) |
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| 申込み研究会 | Space, Aeronautical and Navigational Electronics (SANE) |
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| 本文の言語 | ENG |
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| タイトル（英） | Velocity Measurement of Internal Waves in the South China Sea by Multi-Temporal and Multi-Sensor Satellite Images(ICSANE 2013(International Conference on Space, Aeronautical and Navigational Electronics) |
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| キーワード(1)（和/英） | / Internal waves |
| 第 1 著者 氏名（和/英） | / Dan-Bee HONG |
| 第 1 著者 所属（和/英） | University of Science & Technology:Korea Institute of Ocean Science & Technology |
| 発表年月日 | 2013-12-02 |
| 資料番号 | SANE2013-85 |
| 巻番号（vol） | vol.113 |
| 号番号（no） | 335 |
| ページ範囲 | pp.- |
| ページ数 | 6 |
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