Flow visualization in the ocean-implications of laboratorybioluminescence experiments
Rohr, J.
Schoonmaker, J.
Losee, J.
Latz, M.I.
Hyman, M.
SPAWARSYSCEN, San Diego, CA;
This paper appears in: OCEANS '99 MTS/IEEE. Riding the Crest into the 21st Century
Publication Date: 1999
Volume: 1,
On page(s): 145-156 vol.1
Meeting Date: 09/13/1999 - 09/16/1999
Location: Seattle, WA, USA
ISBN: 0-7803-5628-4
References Cited: 38
INSPEC Accession Number: 6497573
Digital Object Identifier: 10.1109/OCEANS.1999.799725
Current Version Published: 2002-08-06
Abstract
The objective of this study is to begin to assess the potential of
using flow-induced bioluminescence as a method for visualizing oceanic
flow fields. The bioluminescence response of dinoflagellates to
quantifiable levels of flow stimulus is characterized in laminar and
turbulent pipe flow. These results are used in a numerical simulation to
predict the spatial extent of the bioluminescent “footprint”
associated with supra-threshold levels of flow agitation in a ship's
wake. Assuming an ideal multi-spectral sensor, estimates of the ratio of
bioluminescent signal to ambient light noise are made for different
bioluminescence potentials, flow agitation and ambient light conditions.
It was found that the pipe flow experiments are remarkably repeatable,
with threshold values for bioluminescence stimulation occurring in
laminar flow at about 1 dyn cm-2. An aircraft carrier moving
at 18 kts is estimated to provide supra-threshold levels of hydrodynamic
stimulus throughout millions of cubic meters of seawater in its wake.
Preliminary multispectral analysis suggests that in littoral waters, for
most of the time, nearly all of the stimulated wake can be
detected
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