Cross-Slope Acoustic Scattering and Transmission Experiment (CASTEx) in the Northeastern South China Sea
Abstract
Sound transmission in the sloping environment of the South China Sea (SCS) shows inherent spatial and temporal instabilities or fluctuations that can be attributed to environmental factors. From 2001 to 2015, a series of joint TaiwaneseU.S. field experiments were conducted in the SCS, for example ASIAEX, VNAS/WISE, and SCOPE/NLIWI; further, sand dune acoustic experiments were also conducted to survey the regional oceanic variabilities and the temporal and spatial variabilities in acoustic propagation in the SCS. The synthesis of the acoustic results obtained through experimentation provides information on the nature of dependency of signal fluctuations on the locale, orientation, range, and strength of nonlinear internal waves (NIWs); the acoustic results also provide insights into the subaqueous sand waves. However, the combined effects of NIWs, sand waves, and topographic variation are still unknown. Further, the potential impact on long-range cross-slope acoustic transmission, with respect to both phenomenology and statistics, is also not clearly understood. To address these issues, we focus on the existing problems on acoustic variations in the northeastern (NE) SCS, from the upper slope, through areas with bedforms and shelf break, and to the shelf regime. Subsequently, the areas are accessed contrariwise as well.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 26, 2020
- Accession Number
- AD1118654
Entities
People
- Yung-sheng Chiu