Accession Number:

ADA574954

Title:

High-Frequency Acoustic Propagation in Shallow, Energetic, Highly-Salt-Stratified Environments

Descriptive Note:

Annual rept.

Corporate Author:

WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING

Personal Author(s):

Report Date:

2012-09-30

Pagination or Media Count:

11.0

Abstract:

The long term goal of this research is to measure and understand high-frequency, line-of-sight acoustic propagation in an estuarine environment characterized by strong tidal flow, often large salinity stratification, high shear, high dissipation rates of turbulent kinetic energy, shear instabilities, and increased water property variability. Acoustic propagation techniques provide a means for remote-sensing of the path-averaged statistical structure and motion of the intervening flow, providing information on the 2-dimensional characteristics of turbulence, microstructure, and advection. Estuaries provide an excellent environment to quantify stratified turbulence and its influence on acoustic propagation as a broad range of stratification and turbulence intensities are encountered within a single tidal cycle. The primary objective is to conduct high-frequency 120 kHz, line-of-sight acoustic propagation measurements from 29 October to 2 November, 2012 in the Connecticut CT River estuary. In addition, measurements of high-frequency broadband acoustic backscattering 30 600 kHz, currents using a 1.2 MHz ADCP, suspended sediment concentrations, fluorescence, and continuous conductivity, temperature, and depth CTD measurements will be performed in order to support the interpretation of the scintillation data.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE