Future Contribution of HF Radar WERA to Tsunami Early Warning Systems
A. DZVONKOVSKAYA, K.-W. GURGEL (2009),
European Journal of Navigation, Vol. 7 No. 2, pp. 17-23, August 2009.
Abstract - -
High-frequency (HF) surface wave radars provide a unique capability to detect targets far beyond the conventional microwave
radar coverage but also could contribute to the development and improvement of Tsunami Early Warning Systems. The HF radar
system WERA is an oceanographic radar placed at the coast and providing simultaneous wide area measurements of ocean surface
current fields and sea state parameters. This paper describes the simulation of tsunami related signatures observed by
HF radar at long ranges in case of a tsunami travelling towards the coast. A tsunami event is modeled using the oceanographic
HAMburg Shelf Ocean Model (HAMSOM), which has high spatial and temporal resolution and gives the ocean surface currents
induced by an approaching tsunami. The tsunami current velocity is converted into modulating signals and superimposed on
measured antenna signals of the WERA radar. The possible ocean surface current changes due to a tsunami event are evaluated
using fast update of the radar backscattered spectra. The proposed tsunami detection technique is based on the ordered-statistics
constant false alarm rate (CFAR) detection algorithm applied to the entropy filed of surface currents. It gives an opportunity
to issue an automated tsunami alert during the real-time monitoring by the WERA radar.
Last update: Wednesday, 25-Nov-2015 15:30:57 CET