Accession Number:

ADA571682

Title:

Seabed Geoacoustic Structure at the Meso-Scale

Descriptive Note:

Annual rept.

Corporate Author:

PENNSYLVANIA STATE UNIV STATE COLLEGE APPLIED RESEARCH LAB

Personal Author(s):

Report Date:

2011-09-01

Pagination or Media Count:

7.0

Abstract:

LONG TERM GOALS The long term science goals are to understand the nature of seabed variability at meso-scales O101- 103 m and determine how meso-scale structures impact acoustic propagation, diffuse reverberation, and clutter. OBJECTIVES The objectives are to develop new observational methods to quantify meso-scale seabed variability uncertainty and also develop modeling techniques to understand the impact of spatial variability on propagation and reverberation. APPROACH The observational approach is based on direct path measurements of seabed reflection and scattering. The key advantages of this approach are 1 high resolution vertically, 0.1m and laterally inner scale of 10m and outer scale of 100 km 2 it substantially reduces uncertainties from the spacetime-varying oceanography and biology due to short path lengths 3 it requires a low source level, 4 can be hosted on an Autonomous Undersea Vehicle AUV, permitting observations of 3D meso-scale features, and making it an attractive eventuality as a survey tool. A cartoon of the system is shown in Figure 1.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE