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Island Wakes: The Interaction of Land, Air, and Sea

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True color images. High resolution. 250 m per pixel. Swath width 1000 km. Materials ... Quantitative data from satellite images. Allows fieldwork over the ... – PowerPoint PPT presentation

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Tags: air | interaction | island | land | sea | wakes

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Title: Island Wakes: The Interaction of Land, Air, and Sea


1
Island Wakes The Interaction of Land, Air, and
Sea
  • By Ashley Diggs, Susan Jacob, Samuel Burlacu,
    Francisco Martinez, Shane Gallup
  • Upward Bound Math and Science
  • SEEMS 2004

2
Introduction
  • Island Wake
  • Disturbance in wind, clouds, and ocean waves
    caused by flow past an island
  • Types of island wakes
  • Smooth convergence
  • Twin vortices
  • Karman Vortices
  • Turbulent

3
Karman Vortex Theory
  • Drag slows wake causing spin along its edges
  • Eddies will scale with obstacle size
  • The ratio between cross stream and along stream
    spacing of successive eddies is 28

4
Satellite Background
  • Terra and Aqua
  • NASA MODIS satellites
  • Polar Orbiting
  • True color images
  • High resolution
  • 250 m per pixel
  • Swath width gt 1000 km

5
Materials
  • MODIS satellite images
  • Adobe Photoshop
  • Microsoft Excel
  • Album of Fluid Mechanics

6
Procedure
  • Qualitative Analysis
  • Wake type
  • Wind field - 3D
  • Cloud pattern
  • Quantitative Analysis
  • Island size
  • Vortex positions
  • Vortex spacing

7
Qualitative Results
  • Fewer clouds in center of vortices
  • Clouds on upwind side of vortex pairs
  • Downdrafts in center of vortices
  • Updrafts upwind of vortex pairs

8
Quantitative Results
  • The larger the island, the slower the wake
  • Large islands give large vortices
  • The ratio between cross stream and along stream
    spacing of successive eddies is 77, not 28

9
Conclusion
  • Technological Advancement
  • Quantitative data from satellite images
  • Allows fieldwork over the oceans
  • Societal Importance
  • Building location
  • Sea travel
  • Fishing
  • Recreation

10
Acknowledgments
  • Our group would like to thank our professors,
    Drs. George Young and Eugene Clothiaux for their
    expertise in meteorology.
  • We would also like to thank our UBMS faculty
    member, Dustin Wenner for his guidance and
    assistance.
  • Inspiration by Drs. Von Karman and Smith
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