The Reflection of Low Frequency Sonar Signals from a Smooth Ocean Bottom. Part II. Calculations of Bottom Losses for a Layered Model and Comparison with Experimental Values,
Abstract
In Part II of this paper, calculations are made for the bottom loss of a plane sound wave reflecting from a layered model of the ocean bottom. The sea floor is considered to consist of an arbitrary number of absorbing solid layers, each of constant thickness, lying on an absorbing solid half-space. Comparisons are made between the calculated losses and the experimental values given in Part I. In one of the experimental areas a core sample of the sediment was obtained so that a bottom model could be constructed to accurately represent the in situ layering. Attenuation constants for this model were chosen so that the calculated and experimental bottom loss curves are in reasonable agreement. These constants are in general agreement, assuming a linear relation between sound attenuation (in db/ft) and frequency, with high frequency resonant chamber measurements on similar sediment types. In the other two areas less is known about the nature of the sea floor sediments. Bottom models constructed for these areas provide possible explanations of the experimental loss curves.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1963
- Accession Number
- ADA074408
Entities
People
- H. P. Bucker
Organizations
- Navy Electronics Laboratory