Acoustic Propagation Studies in the Nonlinear Internal Wave Initiative (NLIWI) in the South China Sea (SCS).

摘要

Quantify the temporal and spatial variability in acoustic propagation characteristics on the continental shelf in the South China Sea in the presence of trans-basin and locally-generated nonlinear internal waves; specifically: (1) at long ranges (up to 100 km), to investigate (a) the focusing effect in acoustic propagation parallel to the NLIW's, and (b) range dependence over long distances, through a highly dynamic environment, towards the physical oceanography study area along 21N; and (2) at short ranges (less than 10 km), to limit the number of internal waves and bottom interactions, allowing (1) better quantification of the statistics of acoustic fluctuations in an unsaturated regime as a function of time, frequency, range and bearing relative to internal wave fronts, and (2) isolation of the relative contributions of the variability in the water column and bottom topography/composition.