Measuring Surface Currents off the Outer Banks of North Carolina Luke Stearns 1, Harvey Seim 1, Mike Muglia 2 1 UNC Chapel Hill 2 UNC Coastal Studies Institute.

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Presentation transcript:

Measuring Surface Currents off the Outer Banks of North Carolina Luke Stearns 1, Harvey Seim 1, Mike Muglia 2 1 UNC Chapel Hill 2 UNC Coastal Studies Institute National Park Service photo

Site Locations

Synopsis System Changes –Variations in Coverage –Antenna Pattern Measurement –Radio Frequency Noise ADCP Comparison Gulf Stream Position & Shelf Break Currents

Hatteras Radials and Events

Duck Radials and Events

Daily Medians Hurricane Isabel

Percent Coverage

Strange Vectors

Antenna Pattern Measurement

Duck Patterns 2004/12/ /12/122003/06/ /12/06

Antenna Pattern Measurement Hatteras Patterns 2003/06/242004/05/ /06/08

Noise in the Spectral Data 2004/12/12 00:00 18:00

Radio Frequency Noise 2004/12/12 Duck Tx 00:0018:00

Noise in the Spectral Data 2003/12/03 Duck Hatteras 02:0008:0014:00

Radio Frequency Noise 2003/12/03 02:0008:0014:00

ADCP Mooring Location ADCP Location

ADCP Comparison Measured Beam Patterns

ADCP Comparison Ideal Beam Patterns

Hovmoller Line Hovmoller Line: 35.5

Hovmoller Northward Velocity Diagram 2004/08

Hovmoller Northward Velocity Diagram 2004/11

Summary Coverage varies significantly Many factors may influence data quality: –Radio Frequency noise –Antenna Pattern Measurements –Antenna position and transmit frequency ADCP Comparison shows mediocre results APMs effect the data but quality may be similar Gulf Stream Front effects shelf currents

Future Work Compare Codar radials to ADCP’s directional components Frequency decomposition of both datasets Develop better outlier identification procedures Compare with ship-track ADCP from Gawarkiwecz and Savidge cruise (Fall 2004) Look at quantification of the Gulf Stream Front and its effects on shelf flow

Thanks Harvey Seim (Ideas, Money) Mike Muglia (Ideas, Upkeep) CodarOS (Great support) ROWG (Sharing of Ideas) SEACOOS (Funding, Ideas) You all for listening and sharing expertise!