A new Lagrangian-Acoustic Drogue (LAD) for monitoring flow dynamics in an estuary: a quantification of its water-tracking ability

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Title A new Lagrangian-Acoustic Drogue (LAD) for monitoring flow dynamics in an estuary: a quantification of its water-tracking ability
Author Schacht, Christie Margaret; Lemckert, Charles James
Journal Name Journal of Coastal Research
Editor C Finkle
Year Published 2007
Place of publication USA
Publisher Coastal Education & Research Foundation
Abstract We describe a novel in situ measuring drogue device developed for the investigation of near-surface sediment and flow dynamics in an estuary. The Lagrangian Acoustic Drogue (LAD) comprises a unique configuration of instruments including a downward-facing 600 kHz Broadband Acoustic Doppler Current Profiler mounted on a Lagrangian float; a Differential Global Positioning System; and a (Conductivity, Temperature, Depth sensor. Open ocean studies have revealed the necessity of understanding the Lagrangian nature of the drifter or drogue. As the ocean and estuarine systems are two vastly distinct environments, a separate study was conducted using the LAD in an estuarine environment. The main objective of this study was to directly quantify the LAD's ability to track and monitor a Lagrangian parcel of water over a slack-water period. It was found that the LAD confidently tracked a parcel of water to a depth of 4.5 m. It was also found that the water tracking ability (slippage) was directly related to the magnitude of tidal velocity. This study also revealed characteristics about the physical state of the estuary itself, and gave positive outlook for the future of drogue-based studies in estuaries.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.cerf-jcr.org/
Copyright Statement Copyright 2007 CERF. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 50
Page from 420
Page to 426
ISSN 0749-0208
Date Accessioned 2008-02-25
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Physical Oceanography
URI http://hdl.handle.net/10072/17928
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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