Publication:
On the structure and dynamics of stratified wakes generated by submerged propagating objects

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Authors
Moody, Zachary E.
Merriam, Christopher J.
Radko, Timour
Joseph, John
Subjects
stratified wake
submerged
propagating
AUV
detection
Advisors
Date of Issue
2017
Date
Publisher
Taylor & Francis
Language
Abstract
The structure and intensity of the intermediate wake generated by a submerged propagating body in a stratified fluid was studied using a combination of (i) numerical simulations, (ii) field measurements, and (iii) laboratory experiments. The numerical component offered guidance for the field work performed in Monterey Bay (CA, USA) in the summer of 2015. The field work focused on subsurface thermal signatures of a submerged propagating object. Vertical temperature profiles suggested that long-term changes in thermal stratification can occur after the passage of a towed body. Horizontal temperature variability, measured by an autonomous underwater vehicle facilitated the identification of the wake using perturbation temperature variance as the key diagnostic variable. Analogous thermal signatures of stratified wakes were found in ocean observations and in modelling results. The influence of the tow ship on the wake was shown to be minimal. Laboratory experiments focused on the surface expression of stratified wakes were used to complement numerical simulations and field measurements. All three components of this project indicate that detection of the wake of a submerged object based on its thermal signatures is a viable and effective approach.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1080/1755876X.2017.1307801
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Naval Research Program
Consortium for Robotics and Unmanned Systems Education and Research (CRUSER)
Office of Naval Research
Funder
NPS-N16-N155-A
NPS-FY17-N262-A
N0001315WX00646
Format
14 p.
Citation
Moody, Zachary E., et al. "On the structure and dynamics of stratified wakes generated by submerged propagating objects." Journal of Operational Oceanography 10.2 (2017): 191-204.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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