Surface Current Mapping in the Lower Chesapeake Bay
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Surface Current Mapping in the Lower Chesapeake Bay
Larry Atkinson
Teresa Garner
Jose Blanco
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Two sites - one at Norfolk City beach and one at Bay Bridge Tunnel Island #4
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The whole lower Bay is covered. Addition of a NOAA site at CPHN will provide coverage offshore and redunancy inside The whole lower Bay is covered. An additional NOAA site at CPHN will provide coverage offshore and redundancy inshore
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Average for Time period:May 24 22:00 – Aug 23 19:00 (2007)
CBBT VIEW
Range (km) 29.5 34.2
Noise Floor, Monopole (dBm)
-130.2 -143.1
Signal To Noise, Monopole (dB)
32.4 39.5
Radial Vector Count (measured pattern)
686 417
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S/N varies diurnally
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Current and Future Data Coverage
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Initial Products - Hourly vectors, 50 hour subtidal means, tidal ellipses, 6 hour trajectory
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Data Quality and Validation
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Measured and Ideal Beam Patterns
View – On Beach CBBT – on Island Ideal
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Baseline comparisons improved significantly using the measured beam patterns
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The radial speed should be the same from each antenna at the middle of the baseline.
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NOAA PORTS has 3 ADCP’s on Coast Guard ATON buoys in the area
CPHN
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Time series of absolute speed for hourly averaged NOAA ADCP data (blue) and CODAR data (red) and their difference (black line).
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Means and standard deviations of the speed differences (absolute value of ADCP data – CODAR data).
Site Mean (cm/s)
Standard Deviation
(cm/s)
Search Radius (km)
Cape Henry 16.2 14.0 2
Thimble Shoals 13.2 11.2 1
York Spit 13.9 10.0 1.25
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Product development for specific users – Navigation channels, sewage effluent, Navy special ops.
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Wave and wave steepness – NWS and
Weatherflow.
CODAR wave product to betested with NOAA/NWS and Weatherflow.
Probably only good during southward winds.
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Trajectory mapping and optimal interpolation for hazmat
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Future work
• We plan to tow an ADCP for further data comparisons focusing on key areas where we will collect data within a few radial footprints for at least four hours to compare with radials.
• Other comparisons will be possible using ADCP transects from routine monthly Bay Mouth cruises.
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Comments
• ROW-G is critical to success of this RESEARCH to OPERATIONS program
• Creating products users can use is critical – this is usually not a vector map.
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Contacts and Information
Project website: www.lions.odu.edu/org/cbc
National HFRADAR Network Gateway: http://cordc.ucsd.edu/projects/mapping
Center for Coastal Physical Oceanography, Old Dominion University, Norfolk, VA 23529
Teresa Garner ([email protected])
Jose Blanco ([email protected])
Larry Atkinson ([email protected])
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References
• Lipa, B.J., B.Nyden, D.S. Ullman, and E. Terrill, “SeaSonde Radial Velocities: Derivation and Internal Consistency,” IEEE J. Ocean. Eng.,vol. 31, no.4, pp. 850-861, Oct. 2006.
• NOAA Ocean Systems Test and Evaluation Program (OSTEP), "Test, Evaluation, and Implementation of Current Measurement Systems on Aids-To-Navigation", NOAA Technical Report NOS CO-OPS 043, Silver Spring, MD, 2005.
• Yoshikawa,Y., A. Masuda, K. Marubayashi, M. Ishibashi, and A Okuno, “On the accuracy of HF radar measurement in the Tsushima Strait,” J. Geophys. Res., 111, C04009, doi:10.1029/2005JC003232.