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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Time-resolved polarimetry over water waves: relating glints and surface statistics.

M Ottaviani1, C Merck, S Long

  • 1Department of Physics & Engineering Physics, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA. mottavia@stevens.edu

Applied Optics
|April 4, 2008
PubMed
Summary

This study characterizes sunglint under controlled lab conditions, identifying atomic glints as Fresnel reflections from wave facets. It reveals sunglint behavior is dictated by wave type, with capillary waves dominating mixed conditions.

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Published on: October 31, 2011

Area of Science:

  • Optics
  • Fluid Dynamics
  • Remote Sensing

Background:

  • Sunglint, a common satellite remote sensing phenomenon, lacks detailed laboratory characterization.
  • Understanding sunglint requires controlled experiments to analyze its optical properties and origins.

Purpose of the Study:

  • To fundamentally characterize sunglint under controlled laboratory conditions.
  • To investigate the relationship between wave slope distributions and sunglint occurrence.
  • To differentiate sunglint behavior in gravity versus capillary wave states.

Main Methods:

  • Utilized a custom apparatus with a photopolarimeter and laser source to study a wavy water surface.
  • Employed an imaging system to retrieve wave slope distributions and correlated them with glint time series.
  • Applied Hilbert-Huang and Fourier transform techniques to analyze wave slope data.

Main Results:

  • Identified individual sunglints as Fresnel reflections from single wave facets.
  • Demonstrated periodic glint sequences for gravity waves and erratic behavior for capillary waves.
  • Showed that capillary waves govern sunglint properties in mixed gravity-capillary conditions.

Conclusions:

  • Sunglint can be fundamentally characterized in a laboratory setting.
  • The origin and behavior of sunglint are directly linked to underlying water wave dynamics.
  • Capillary wave states significantly influence sunglint characteristics, even in mixed wave regimes.