Affiliation:
1. Applied Physics Laboratory, University of Washington, Seattle, Washington 98105, USA
Abstract
Observed near the seafloor, broadband noise emissions from a vessel passing directly above exhibit frequency bands where potential acoustic energy is greater than kinetic energy while the opposite occurs in neighboring frequency bands. The condition where the dynamic and kinematic energy forms differ in this manner is characteristic to interference involving steep angles or near-normal incidence reflection from the seafloor. Measurements are made at two experimental sites using a research vessel passing above a vector sensor, positioned ∼1.5 m above the seabed, resulting in a vessel horizontal range approaching ∼0. The data are expressed as a ratio of kinetic to potential energy in decibels and yield information on seabed properties. A model for kinetic and potential energy is developed from the method of images using a layered seabed and is used to invert data collected in Puget Sound. A higher-impedance seabed is identified via inversion, which is consistent with the thin Holocene sediments in the region. For data collected on the New England Mud Patch, the model is instead applied directly to nominal seabed parameters originating from prior studies that identify a low-speed mud layer atop a higher-speed transition layer separating the mud substrate from a sediment basement.
Publisher
Acoustical Society of America (ASA)
Subject
Acoustics and Ultrasonics,Arts and Humanities (miscellaneous)
Reference24 articles.
1. Vector acoustic and polarization properties of underwater ship noise
2. G. V. Frisk
, Ocean and Seabed Acoustics: A Theory of Wave Propagation (
Prentice Hall,
Englewood Cliffs, NJ, 1994), pp. 80–83.
3. L. Brekhovskikh
, Waves in Layered Media (
Academic,
New York, 1960), pp. 56–60.
4. Complex ray methods for acoustic interaction at a fluid–fluid interface
5. A plane‐wave reflection loss model including sediment rigidity
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献