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The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography

The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography. Argus I. Argus II. Argus III. Pixel Instrument Coverage (early test example). shoreline. NCEX Tessellation Array. Resolution limited (5 m). tile. 1842 pixels. Tessellation Array Locations.

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The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography

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  1. The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography

  2. Argus I

  3. Argus II

  4. Argus III

  5. Pixel Instrument Coverage (early test example)

  6. shoreline NCEX Tessellation Array Resolution limited (5 m) tile 1842 pixels

  7. Tessellation Array Locations

  8. Example Directional Spectra

  9. Example Directional Spectra

  10. Example Directional Spectra

  11. Tessellation Arrays • Produce wave directional “spectrum” at any location • Extract simple statistics (peak direction?) • Use same lag array for depth estimation

  12. NCEX Array, 09/03

  13. NCEX Array, 09/03 (blow-up) Runup Vbar Tess (alpha and bathy “Old” Bathy Line

  14. Longshore Currents (Chris Chickadel)

  15. Orientation for Next Slide

  16. 10/31/03, 0700 Variance Image Rip current Happy Halloween

  17. Radiation Stress Gradients • Components in both the longshore and cross-shore directions • Concentration on diagonal component Sxy • Optical techniques necessary for all parameters to allow remote sensing where: Sxy = Radiation Stress <e> = mean dissipation due to wave breaking a = local incident wave angle c = celerity Work of Jason Killian

  18. Fusion with Numerical Models • Based on: • Wave direction • Surf zone width

  19. California Fires, 10/28/03 Mid-afternoon view Southern California

  20. Estimation of Swash Velocities Runup transect from NCEX exp’t, 2004

  21. Two-minute Time Stack NCEX stack, 2003

  22. Band-pass Isolation of Foam

  23. Consecutive Intensity Transects

  24. Analysis • Band-pass to isolate foam • Hilbert transform to extract phase and wavenumber • U = d(phase)/dt * 1/k

  25. Example Sub-stack Results

  26. Example Sub-stack

  27. Example Sub-stack Overlay

  28. Two-minute Sub-stack Example 17 minute run takes 9 seconds

  29. Dy Longshore velocity = = 0.60 m/ sec Dt Application of Hilbert Approach to Longshore Currents? (and rips?) Longshore Distance (m) -20 20 0 Duck, NC Dt = 18.7 s Time (sec) 40 Dy =11.3 m

  30. Questions? Costas Synolakis Oregon State University Wave Tank, 2003 Dr. Aarninkhof Distinguished Argus Scientist

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