Tang Tswen Yung

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Tswen Yung

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  • Article
    Research highlights from the Asian Seas International Acoustics Experiment in the South China Sea
    (IEEE, 2004-10) Lynch, James F. ; Ramp, Steven R. ; Chiu, Ching-Sang ; Tang, Tswen Yung ; Yang, Yiing-Jang ; Simmen, Jeffrey A.
    The Asian Seas International Acoustics Experiment (ASIAEX) included two major field programs, one in the South China Sea (SCS) and the other in the East China Sea (ECS). This paper summarizes results from the work conducted during April and May 2000 and 2001 over the continental shelf and slope in the northeastern South China Sea, just east of Dongsha Island (Pratis Reef). The primary emphasis of the field program was on water-column variability and its impact on acoustic propagation loss. The reader is steered to the appropriate paper within this Special Issue when more information on a specific topic is desired.
  • Article
    Internal tide and nonlinear internal wave behavior at the continental slope in the northern south China Sea
    (IEEE, 2004-10) Duda, Timothy F. ; Lynch, James F. ; Irish, James D. ; Beardsley, Robert C. ; Ramp, Steven R. ; Chiu, Ching-Sang ; Tang, Tswen Yung ; Yang, Yiing-Jang
    A field program to measure acoustic propagation characteristics and physical oceanography was undertaken in April and May 2001 in the northern South China Sea. Fluctuating ocean properties were measured with 21 moorings in water of 350- to 71-m depth near the continental slope. The sea floor at the site is gradually sloped at depths less than 90 m, but the deeper area is steppy, having gradual slopes over large areas that are near critical for diurnal internal waves and steep steps between those areas that account for much of the depth change. Large-amplitude nonlinear internal gravity waves incident on the site from the east were observed to change amplitude, horizontal length scale, and energy when shoaling. Beginning as relatively narrow solitary waves of depression, these waves continued onto the shelf much broadened in horizontal scale, where they were trailed by numerous waves of elevation (alternatively described as oscillations) that first appeared in the continental slope region. Internal gravity waves of both diurnal and semidiurnal tidal frequencies (internal tides) were also observed to propagate into shallow water from deeper water, with the diurnal waves dominating. The internal tides were at times sufficiently nonlinear to break down into bores and groups of high-frequency nonlinear internal waves.