BAMOS Sep 2020
15
Figure 6 . Time series of low pass filtered (> 36 hour ) water levels from coastal stations in Western Australia associated with the passage of tropical low 14U in January 2017 . The locations and the track of 14U are shown on Figure 2 . The vertical arrows indicate peaks in water level . was recorded at Port Hedland . The propagation speed of the CSW between Port Hedland and Onslow was 6.27 ms -1 , close to the propagation speed of 6.6 ms -1 for 14U indicating that resonance conditions may have occurred . This also highlights that the magnitude of the CSW is dependent more on the propagation speed and path of the storm system rather than the intensity ( see also Eliot and Pattiaratchi 2010 ).
This article has highlighted resonance phenomena between the atmosphere and the ocean that result in extraordinary response in the coastal ocean . If the propagation speeds of the atmospheric systems correspond to water depths on the continental shelf , extreme water levels can result due to meteotsunamis or continental shelf waves . The diurnal‐inertial response results in deeper penetration of wind action through the water column at critical latitudes .
Acknowledgements
Sea level data were obtained from Department of Transport , WA ( Onslow , Exmouth , Carnarvon , Jurien Bay and Fremantle ); Pilbara Port Authority ( Port Hedland ) and Bureau of Meteorology ( Broome , Hillary ’ s Boat Harbour ). Mooring data ( TR50 ) were collected through the Integrated Marine Observation System ( IMOS ), a national collaborative research infrastructure enabled by the National Collaborative Research Infrastructure Strategy ( NCRIS ).
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