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SeaSonde and Tide Gauge Tsunami Observations New Jersey June 13, 2013 PowerPoint PPT Presentation


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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

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Seasonde and tide gauge tsunami observations new jersey june 13 2013

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 and tide gauge tsunami observations new jersey june 13 2013

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


Seasonde and tide gauge tsunami observations new jersey june 13 2013

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


Seasonde and tide gauge tsunami observations new jersey june 13 2013

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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