DocumentCode :
1515990
Title :
Analysis of an Event of “Parametric Rolling” Onboard RV “Polarstern” Based on Shipborne Wave Radar and Satellite Data
Author :
Bruns, Thomas ; Lehner, Susanne ; Li, Xiao-Ming ; Hessner, Katrin ; Rosenthal, Wolfgang
Author_Institution :
Deutscher Wetterdienst (DWD), Hamburg, Germany
Volume :
36
Issue :
2
fYear :
2011
fDate :
4/1/2011 12:00:00 AM
Firstpage :
364
Lastpage :
372
Abstract :
During the Antarctic summer season 2008/2009 the wave radar system WaMoS II was installed onboard of the German research vessel “Polarstern.” The purpose was to collect quasi-in situ data for the comparison with satellite-borne SAR and altimeter instruments (Envisat, TerraSAR-X, Jason). The experiment was part of the German research project DeMarine-Security. On 7 March 2009 in the central South Atlantic Ocean, “Polarstern” was heading towards Punta Arenas against a rough cross sea. In the night, a sudden event of heavy rolling, i.e., an oscillation about its length axis, hit the vessel and lasted for a few minutes. Using WaMoS II data, as well as ENVISAT and wave model data, we investigate the conditions under which the event occurred. It is shown that the rolling was caused by a “parametric” resonance when the period of encounter came close to one half of the vessels´s natural rolling period. We conclude that an onboard wave radar can be helpful in diagnosing and forecasting critical conditions.
Keywords :
ocean waves; oceanographic techniques; remote sensing by radar; ships; AD 2009 03 07; ENVISAT data; RV Polarstern; WaMoS II wave radar system; central south Atlantic Ocean; heavy ship rolling; parametric resonance; parametric rolling; satellite data; ship length axis oscillation; shipborne wave radar data; vessels natural rolling period; wave encounter period; wave model data; Marine vehicles; Radar imaging; Stability criteria; Wind; Ocean surface waves; parametric rolling; shipborne wave radar; synthetic aperture radar;
fLanguage :
English
Journal_Title :
Oceanic Engineering, IEEE Journal of
Publisher :
ieee
ISSN :
0364-9059
Type :
jour
DOI :
10.1109/JOE.2011.2129630
Filename :
5766770
Link To Document :
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