Influence of Shallow Water Internal Wave Fields on the Properties of Acoustic Signals - WHOI and NPS Analyses of 1995 Data.

摘要

LONG TERM GOAL. The long-term goal is simple: to understand the scattering of low to intermediate frequency sound (10-2500 Hz) in shallow water by linear and non-linear internal waves. This requires an understanding of both the acoustic effects of the waves and the features of the coastal waves themselves. The oceanography and the acoustics are inseparable. SCIENTIFIC OBJECTIVES. The objective is to understand the physics of propagation and the oceanographic conditions on the shelf to the degree required to explain acoustical behavior during the 1995 SWARM (Shallow Water Acoustics in a Random Medium) experiment. The experiment took place on the shelf east of New Jersey. 224 and 400 Hz sound was propagated 32 km in the offshore direction to a pair of vertical receiver arrays. The regions had a gradually sloping bottom, many packets of solitary waves propagating inshore, internal tidal bores, and continuous linear internal waves.