The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography
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Transcript of The Role of Argus in the NCEX Field Experiment Rob Holman SECNAV/CNO Chair in Oceanography
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The Role of Argus in the NCEX Field Experiment
Rob HolmanSECNAV/CNO Chair in Oceanography
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Argus I
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Argus II
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Argus III
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Pixel Instrument Coverage (early test example)
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shoreline
NCEX Tessellation Array
Resolution limited (5 m)
1842 pixels
tile
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Tessellation Array Locations
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Example Directional Spectra
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Example Directional Spectra
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Example Directional Spectra
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Tessellation Arrays
• Produce wave directional “spectrum” at any location
• Extract simple statistics (peak direction?)
• Use same lag array for depth estimation
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NCEX Array, 09/03
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NCEX Array, 09/03 (blow-up)
Runup
“Old” Bathy Line
Vbar
Tess(alpha and bathy
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Longshore Currents(Chris Chickadel)
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Orientation for Next Slide
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10/31/03, 0700 Variance Image
Happy Halloween
Rip current
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Radiation Stress Gradients
cx
Sxy αε sin><=
∂∂
where:
Sxy = Radiation Stress
<ε> = mean dissipation due to wave breaking
α = local incident wave angle
c = celerity
•Components in both the longshore and cross-shore directions
•Concentration on diagonal component Sxy
•Optical techniques necessary for all parameters to allow remote sensing
Work of Jason Killian
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Fusion with Numerical Models
Based on:• Wave direction• Surf zone width
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California Fires, 10/28/03
Mid-afternoon view
Southern California
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Estimation of Swash Velocities
Runup transect from NCEX exp’t, 2004
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Two-minute Time Stack
NCEX stack, 2003
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Band-pass Isolation of Foam
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Consecutive Intensity Transects
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Analysis
•Band-pass to isolate foam
•Hilbert transform to extract phase and wavenumber
•U = d(phase)/dt * 1/k
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Example Sub-stack Results
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Example Sub-stack
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Example Sub-stack Overlay
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Two-minute Sub-stack Example
17 minute run takes 9 seconds
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Application of Hilbert Approach to Longshore Currents?(and rips?)
Longshore velocity = = 0.60 m/ secyt
Duck, NC
0
40
Tim
e (s
ec)
t =
18.
7 s
y =11.3 m
-20 20Longshore Distance (m)
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Questions?
Dr. AarninkhofDistinguished Argus Scientist
Costas Synolakis
Oregon State University Wave Tank, 2003