Infrared Remote Sensing of Surf-Zone Eddies

Airborne infrared imagery is used for the first time to investigate characteristics of surf-zone eddies, occurring along an along-shore uniform beach. Eddies are found to have diameters of 100 to 150 m, an alongshore spacing of about 375 m (2.5 times the surf-zone width), and lifetimes of 40 min and...

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Veröffentlicht in:IEEE journal of selected topics in applied earth observations and remote sensing Jg. 6; H. 3; S. 1710 - 1718
Hauptverfasser: Marmorino, George O., Smith, Geoffrey B., Miller, W. David
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Piscataway IEEE 01.06.2013
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Airborne remote sensing
California (USA)
Cameras
Deformation
Eddies
Fluid dynamics
Fluid flow
Huntington Beach
Image edge detection
infrared imagery
Marine
Ocean temperature
Remote sensing
Sea surface
Shorelines
slicks
spiral vortex
Spirals
Strips
Surf
surf-zone eddies
Surface flow
Surface waves
Surfactants
Turbulence
Turbulent flow
ISSN:1939-1404, 2151-1535
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Zusammenfassung:Airborne infrared imagery is used for the first time to investigate characteristics of surf-zone eddies, occurring along an along-shore uniform beach. Eddies are found to have diameters of 100 to 150 m, an alongshore spacing of about 375 m (2.5 times the surf-zone width), and lifetimes of 40 min and longer. Eddies travel alongshore at speeds of \sim 0.3 to 0.5 m/s, at a distance from the shoreline of about 1.3 surf-zone widths. Eddies are also observed to move directly offshore, two surf-zone widths from the shoreline. Fine-scale thermal structure within an eddy includes \sim 6-m-wide cold patches, possibly the surface imprints of bottom-induced turbulence, and a small ( < 10-m wide) 'cold core', likely from accumulation of surfactant by radially inward surface flow. Visualization of an eddy is enhanced through flow deformation of surfactant slicks. In particular, narrow slicks appear to be wound-up by an eddy into spirals similar in form to those of a free vortex. In this sense, these nearshore eddies resemble ocean sub-mesoscale 'spiral eddies' as seen in synthetic-aperture radar and sunglint imagery.
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ISSN:1939-1404
2151-1535
DOI:10.1109/JSTARS.2013.2257695