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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

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

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  1. 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

  2. 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

  3. 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

  4. 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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