seasonde and tide gauge tsunami observations new jersey june 13, 2013
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
Arrival time vs. distance from shore Tsunami observations 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
Distance from shore :Blue -7km Red -9km Black-11kmGreen-13km
Blue: SeaSondeRed: Tide Gauge
SeaSonde onshore velocity Tide gauge water level
Tsunami observations June 13, 2013 2100-2400
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
IOOS MARACOOS RegionalAssociation SeaSonde radar
network managed by Rutgers
Example of current maps from the 2011 Japan tsunami