Broadband acoustic quantification of stratified turbulence
Lavery, Andone C.
Geyer, W. Rockwell
Scully, Malcolm E.
MetadataShow full item record
High-frequency broadband acoustic scattering techniques have enabled the remote, high-resolution imaging and quantification of highly salt-stratified turbulence in an estuary. Turbulent salinity spectra in the stratified shear layer have been measured acoustically and by in situ turbulence sensors. The acoustic frequencies used span 120–600 kHz, which, for the highly stratified and dynamic estuarine environment, correspond to wavenumbers in the viscous-convective subrange (500–2500 m−1). The acoustically measured spectral levels are in close agreement with spectral levels measured with closely co-located micro-conductivity probes. The acoustically measured spectral shapes allow discrimination between scattering dominated by turbulent salinity microstructure and suspended sediments or swim-bladdered fish, the two primary sources of scattering observed in the estuary in addition to turbulent salinity microstructure. The direct comparison of salinity spectra inferred acoustically and by the in situ turbulence sensors provides a test of both the acoustic scattering model and the quantitative skill of acoustical remote sensing of turbulence dissipation in a strongly sheared and salt-stratified estuary.
Author Posting. © Acoustical Society of America, 2013. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 134 (2013): 40-54, doi:10.1121/1.4807780.
Showing items related by title, author, creator and subject.
The relative effect of particles and turbulence on acoustic scattering from deep sea hydrothermal vent plumes revisited Xu, Guangyu; Jackson, Darrell R.; Bemis, Karen G. (Acoustical Society of America, 2017-03-03)The relative importance of suspended particles and turbulence as backscattering mechanisms within a hydrothermal plume located on the Endeavour Segment of the Juan de Fuca Ridge is determined by comparing acoustic backscatter ...
Spatial variability of bottom turbulence over a linear sand ridge mooring deployment and AUTOSUB AUV survey cruise report R/V RRS Challenger, cruise number 146 Broken Bank, North Sea, U.K., 17 – 28 August 1999 cruise report Voulgaris, George; Trowbridge, John H.; Terray, Eugene A. (Woods Hole Oceanographic Institution, 2001-08)Two successful AUTOSUB deployments were carried out during August 1999 as part of the AUTOSUB Thematic Program project titled “Spatial Variability of Bottom Turbulence over a Linear Sand Ridge,” funded by the Natural ...
Observations of broadband acoustic backscattering from nonlinear internal waves : assessing the contribution from microstructure Lavery, Andone C.; Chu, Dezhang; Moum, James N. (IEEE, 2010-11-30)In this paper, measurements of high-frequency broadband (160-590 kHz) acoustic backscattering from surface trapped nonlinear internal waves of depression are presented. These waves are ideal for assessing the contribution ...