Mr. Robert Forney Dr. Hugh Roarty Dr. Scott Glenn Measuring Waves with a Compact HF Radar MTS/IEEE...
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Transcript of Mr. Robert Forney Dr. Hugh Roarty Dr. Scott Glenn Measuring Waves with a Compact HF Radar MTS/IEEE...
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Mr. Robert ForneyDr. Hugh RoartyDr. Scott Glenn
Measuring Waves with a Compact HF Radar
MTS/IEEE OCEANS15October 2015
Washington DC
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MARACOOS HF RADAR NETWORK
5 MHz 13 MHz 25 MHz
U Mass
WHOI
U Conn
URI
Stevens
Rutgers
Delaware
ODU/CIT
UNC
9 17 8 17
42 Stations in Total
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Radial Velocity Measurement
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Combine Radial Velocity Measurements
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Total Vector Surface Current Measurements
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Spectra From the Radar
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National Waves Plan
Location New Sensors
Total Acquisition
Cost
Unit Acquisition
CostOffshore 13 $3.9M $300,000
Outer Shelf 17 $3.9M $229,000
Inner Shelf 19 $2.3M $120,000
Coastal 66 $7.9M $120,000
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West Coast HF Radar Measurements
Average correlation with wave buoys: 0.88Root mean square difference:
0.53 mStandard Deviation of difference:
0.48 m
2011 Journal of Sensors
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West Coast Bathymetry
30 meter isobath
Long (2011) used five 13 MHz HF Radars along
California coast
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Second Order - Waves
First Order - Currents
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New Jersey Study Area 13 MHz
30 meter isobathBRAD
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Range Cell 2 for all HF radar measurements
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Bragg Period at 13.5 MHz is XX
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Temporal Coverage Feb-Jun 2015
Averaging Time (minutes)
Temporal Coverage
30 32%60 40%
100 43%120 45%180 49%
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Frequency (MHz)
Sweep Rate (Hz)
Doppler Bins
Time FFT CSSAvg/Out
RadialAvg/Out
CSS per Radial
File
5 1 1024 17m 04s 60/30 180/60 5
13 2 512 04m 16s 15/10 75/60 7
25 2 512 04m 16s 15/10 75/30 7
SeaSonde Acquisition CSPro Analyze Spectra
Existing SeaSonde Settings
15
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Radio Frequency
(MHz)
Radio Wavelength
(m)
Bragg Wavelength
(m)Ocean Wave
Period (s)Deep Water Depth (m)
Wave Height Saturation
(m)
5 60 30 4.4 15 2013 23 12 2.7 6 725 12 6 2.0 3 4
Radio Frequency
(MHz)
Radio Wavelength
(ft)
Bragg Wavelength
(ft)Ocean Wave
Period (s)Deep Water
Depth (ft)Wave Height
Saturation (ft)
5 200 100 4.4 50 66
13 75 38 2.7 19 23
25 40 20 2.0 10 13
16
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October 4, 2015
Nor’easter
Hurricane Joaquin
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SILD 25 MHz
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SILD 25 MHz
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Wav
e H
eigh
tW
ave
Perio
d
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Wav
e H
eigh
tW
ave
Perio
d
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SILD 25 MHz
Current
Wind
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RESULTS
• HF Radars are operating throughout Mid Atlantic and other regions of the US
• Main focus is for measuring surface currents• Secondary application can be for measuring
near shore waves