Chiu’s Biography:  

Ching-Sang Chiu is a Distinguished Professor Emeritus of the Oceanography Department at the Naval Postgraduate School in Monterey, California, USA, a Fellow of the Acoustical Society of America, and an Editor-in-Chief of the Journal of Computational Acoustics.  Received a Doctor of Science degree in 1985 from the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution joint program, Chiu’s research specialties include ocean acoustics, acoustical oceanography, and coastal ocean processes.  His research interests include measurement, analysis, modeling and prediction of sound propagation in spatially and temporally varying oceans, and ocean monitoring and process studies using underwater acoustical remote sensing techniques. He has authored and coauthored sixty refereed publications in those subject areas.

Progresses in the Understanding of the Northeastern South China Sea Sound Field:
Experimentations and Modeling

Speaker: Ching-Sang Chiu  

Since 2000, a series of integrated oceanographic and acoustics field studies have been carried out jointly by Taiwan and US scientists to investigate the dominant oceanographic and geological processes and their major impacts on underwater sound transmissions in the northeastern South China Sea.  Under joint sponsorship by the Taiwan Ministry of Science and the US Office of Naval Research, these collaborative field studies include the Asian Sea Acoustics Experiment in 2001 encompassing the shelf break; the Windy Island Soliton Experiments in 2005 and 2006, with the former on the outer shelf and latter in the deep basin; the Non-Linear Internal Wave shelf experiment in 2007, and most recently, the Sand Dunes Experiments in 2013 and 2014 on the upper slope.  Each of these experiments was designed to study different important aspects of the complex environmental and acoustical variabilities unique to this region.  In this paper, an overview of the objectives, design and measurements of each of these experiments is provided.  Significant scientific results pertaining to the acoustical effects of the observed transbasin depression nonlinear internal waves in the basin, on the slope and near the shelfbreak, depression and elevation nonlinear internal waves on the shelf, and large sand dunes on the upper slope are highlighted.  An emphasis in the discussion is placed on the use of acoustic propagation models to assimilate and interpret the measurements in elucidating the linkages between the observed environmental and acoustic propagation phenomena.


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