Abstract
In this study, sea-surface conditions during the Targets and Reverberation Experiment (TREX) are analyzed. The sea-surface directional spectrum was experimentally measured up to 0.6 Hz with two wave buoys separated by 5 km. The analysis presented here focuses on propagation relating to three canonical sea-surfaces observed during the experiment: calm conditions, and rough conditions with waves either perpendicular or parallel to the primary propagation direction. Acoustic data collected during calm and rough conditions show a significant difference in the amount of out-of-plane scattering. Interference due to this out-of-plane scattering is observed in the component of reactive intensity perpendicular to the propagation direction. These observations are compared with those generated using a model of the sea-surface scattering based on a combination of buoy-measured and modeled directional spectrum. Simulated sea-surfaces are also constructed for this numerical study. A model for wind waves is used to obtain surface wavenumbers greater than those measured by the wave buoys (~1.5 rad/m). Importantly, the spectral peak and it direction are well measured by the buoys and no assumptions on fetch are required, resulting in a more realistic wave spectrum and description of sea-surface conditions for acoustic modeling.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call