Horizontal nearshore surface dispersion for the Florida Panhandle
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Authors
Woodall, Kate J
Subjects
Horizontal dispersion
relative dispersion
diffusivity
Beasley Park
drifters
Lagrangian
ADCP.
relative dispersion
diffusivity
Beasley Park
drifters
Lagrangian
ADCP.
Advisors
MacMahan, James
Date of Issue
2014-06
Date
June 2014
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Knowledge of how a buoyant tracer is horizontally dispersed in the nearshore environment is important for a variety of applications, from aiding oil-spill cleanup strategies to detecting drifting mines. Horizontal nearshore surface dispersion for the Florida panhandle was investigated using 75 drifters deployed over a five-day period during the Surfzone Coastal Oil Pathways Experiment (SCOPE) in December 2013. The data set consisted of 382 original drifter pairs in the spatial range of ~ 5 m to ~ 4.5 km with drifter position sampled every 1 sec for a duration of ~ 30 – 40 hours. Lagrangian flow descriptions revealed that the drifters moved coherently with the majority of drifter trajectories correlated with the surface current forced by the local wind field. The horizontal dispersion estimate was quantified using two-particle statistics, D2, and Finite Scale Lyapunov Exponent, λ, methodologies. D2 results revealed a generally ballistic, D2 ~ t2, path-followed regime, with λ results exhibiting enhanced growth over scales < 100 m, with Richardson like growth, λ ~ δ-2/3, for scales > 100 m. It is conjectured that the mechanisms responsible for influencing the horizontal nearshore surface dispersion for the Florida panhandle are complex and likely a combination of mechanisms from small-scale coherent motions to shear, but predominately being forced by the surface current induced by the local wind field. Variability in D2 values is attributed to the orientation change of the drifter trajectories coupled with the variability in the wind field.
Type
Thesis
Description
Series/Report No
Department
Oceanography
Organization
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NPS Report Number
Sponsors
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Distribution Statement
Approved for public release; distribution is unlimited.
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.