Cross-slope Acoustic Scattering & Transmission Experiment (CASTEx) in the Northeastern South China Sea
Abstract
The proposed research is an experimental study in the northeastern South China Sea of cross-slope acoustic scattering and transmission. It would be a continuation of a sequence of ONR-funded experiments aimed at characterizing the effects of a dynamic ocean and variable seafloor properties on the temporal and spatial fluctuations of acoustic transmission. Past experiments primarily focused on 2-D acoustic scattering due to a single particular environmental process (e.g., nonlinear internal wave) or feature (e.g., seafloor sand dunes). This collected dataset of acoustic propagation, coupled with measurements of the waveguide environment and 3-D acoustic modeling, would attempt to understand the complex, coupled, and 3-D effects of multiple environmental processes/features on the acoustic propagation and scattering across the shelf slope, in the northeastern South China Sea. Both a pilot study in 2019 and a main experiment in 2020 are proposed, and both experimental efforts would use capable Taiwan research vessels. Though the Taiwanese will be primarily responsible for the execution of the experiments, American researchers (e.g., Ching-Sang Chiu of NPS and YT Lin of WHOI) having non-ONRG funding will support the design of the experiment and the analysis and 3-D modeling of the environmental and acoustic data. This effort will, therefore, continue to sustain and further develop a longstanding cooperation in oceanography and acoustics between Taiwan and the USA.a) National Sun Yat-Sen University (NSYU), the institution of the PI, has an excellent research program in oceanography and underwater acoustics and has been a past partner in joint at-sea acoustic experiments with ONR-funded American investigators. NSYU, for example, was the Taiwan lead for the successful, 3-year acoustics experiment that commenced in 2012 and involved American researchers. NSYU collaborates well with the National Taiwan University (NTU), which would also have involvement in the proposed experimental investigation. Furthermore, NSYU has access to the very capable Taiwan research vessels, Ocean Researcher 1 (OR1), OR2, OR3 and Legend.b) The PI received his Ph.D. from the Department of Engineering Science and Ocean Engineering, National Taiwan University, over a decade ago, and during his research as a graduate student and afterwards he has been an active ocean acoustician, participating in experiments and studies of sound propagation and geo-acoustic inversion in the South China Sea. The PI was the Taiwan lead for the recent and successful sand-dune and acoustics experiment, and he has been successful in garnering research funding from Taiwan~s Ministry of Science and Technology
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 13, 2019
- Source ID
- N629091912070
Entities
People
- Yung-sheng Chiu
Organizations
- National Sun Yat-sen University
- Office of Naval Research
- United States Navy