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SeaSonde and Tide Gauge Tsunami Observations New Jersey June 13, 2013. Belinda Lipa, Hardik Parikh, Don Barrick Codar Ocean Sensors. Scott Glenn, Hugh Roarty Rutgers University. Synopsis • SeaSonde coastal HF radars see tsunami's orbital velocity

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SeaSonde and Tide Gauge Tsunami Observations

New Jersey June 13, 2013

Belinda Lipa, Hardik Parikh, Don Barrick

Codar Ocean Sensors

Scott Glenn, Hugh Roarty

Rutgers University

Synopsis

• SeaSonde coastal HF radars see tsunami's orbital velocity

• Single radar observes velocity pattern vs. distance offshore

• Flow was observed perpendicular to isobaths

• Arrival-time was obtained vs. distance from shore


SeaSonde onshore velocity vs time

Tide gauge water level vs time

Distance from shore :

Blue -7km Red -9km Black-11kmGreen-13km

Arrival time vs. distance from shore

Tsunamiobservations June 13, 2013 1700-1900

• First observations were offshore - velocity 'minimum' (wave trough)

• Observed 23 km out, 30 minutes before coastal arrival

• Velocity weakens at coast because semi-hard boundary stops flow

• Tide gauge (height) and radar (velocity) arrival times at coast agree

Blue: SeaSonde

Red: Tide Gauge


Tsunami observations June 13, 2013 2100-2400

SeaSonde onshore velocity

Tide gauge water level

Distance from shore :

Blue -7km Red -9km Black-11km Green-13km

• Velocity is first onshore 'maximum' (wave peak),

then offshore 'minimum' (wave trough)

• Radar peak/trough times precede tide-gauge’s by 30 minutes


Future Work: Multiple Radar Sites

• Detrend velocities

• Generate tsunami 2D current maps from

adjacent sites in area

• Interpret patterns in terms of bathymetry

and tsunami height

Example of current maps from the 2011 Japan tsunami

IOOS MARACOOS Regional

Association SeaSonde radar

network managed by Rutgers


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