HF radar detection of tsunamis |
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| Authors: | Belinda J Lipa Donald E Barrick John Bourg Bruce B Nyden |
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| Institution: | (1) Codar Ocean Sensors, 125 La Sandra Way, Portola Valley, CA 94028, USA |
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| Abstract: | This paper demonstrates that HF radar systems can be used to detect tsunamis well before their arrival at a coastline. We
solve the equations of motion and continuity on the ocean surface using models to simulate the signals produced by a tsunami
approaching the east U.S. coast. Height and velocity profiles are derived along with expressions for the radar-observed current
velocities in terms of bathymetry and tsunami height and period. Simulated tsunami-generated radial current velocities are
superimposed on typical maps of radial velocity generated by a Rutgers University HF radar system. A detection parameter is
defined and plotted to quantify the progress of the tsunami, which is shown to be detectable well before its arrival at the
coast. We describe observations/warnings that would have been provided by HF radar systems at locations in the path of the
2004 Indian Ocean tsunami. |
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| Keywords: | Remote sensing modeling HF radar oceanography |
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