Example of Energy Partitioning between Waterborne and Sediment Paths in Underwater Acoustic Propagation.

摘要

In this reprint a first order measure of acoustic energy partitioning at the seafloor is proposed which attempts to compare the level of deeply penetrating energy with the level of energy propagating through the water column and shallow sediments. Such a measure is useful, as it allows one to evaluate the importance of the deep-earth structure in predictions of VLF propagation. This parameter is expected to vary with details of the environment and experimental geometry, but to be sufficiently robust to be characterized by general environmental parameters such as water depth, sediment thickness, and/or stratigraphic and tectonic setting. Based on this measure, the paper provides examples of energy partitioning observed in data obtained from recent propagation measurements conducted by the Naval Oceanographic and Atmospheric Research Laboratory. Keywords: Underwater acoustics, Seismic waves, Scholte waves, Arctic Ocean. (kr)