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SUMMARY:Experiments on the collision of mode-1 and mode-2 internal-solitar
 y-like waves - Magda Carr (Newcastle University)
DTSTART:20221205T143000Z
DTEND:20221205T150000Z
UID:TALK183755@talks.cam.ac.uk
DESCRIPTION:Magda Carr (Newcastle University)\, Marek Stastna (University 
 of Waterloo) & Peter. A. Davies (University of Dundee)\nInternal solitary-
 like waves (ISWs) propagate along density interfaces and are a common feat
 ure in stratified flows. In the ocean\, the majority of ISWs observed are 
 of the first baroclinic mode (mode-1). ISWs of mode-1 displace isopycnals 
 in one direction only. Mode-2 ISWs\, on the other hand\, displace isopycna
 ls in opposite directions and most typically are convex (upper isopcynals 
 are displaced upward and lower isopycnals are displaced downward). Recent 
 observations (Magalhaes & da Silva 2018) suggest that mode-2 ISWs may be m
 ore prevalent than previously thought but still the number of observations
  of them are far fewer than their mode-1 counterparts.\nStastna et al.\, (
 2015) numerically investigated head-on and overtaking collisions between m
 ode-1 and mode-2 ISWs. They showed that there is strong modal coupling bet
 ween mode-1 and mode-2 ISWs during collision. The mode-2 ISWs were signifi
 cantly deformed by the mode-1 wave-induced currents and in most cases lost
  coherence altogether. Stastna et al.\, (2015) attributed the destruction 
 of the mode-2 wave to the mode-1 wave-induced shear across the pycnocline 
 centre and hypothesised that this could be the reason why fewer mode-2 wav
 es are observed in the ocean than mode-1. In this study\, a laboratory inv
 estigation is made of the head-on collision between mode-1 and mode-2 ISWs
 . Excellent agreement is found with the findings of Stastna et al.\, (2015
 ) when the mode-2 wave amplitude is relatively small compared to that of t
 he mode-1 wave. However\, it is shown that if the mode-2 wave is of large 
 enough amplitude it can retain a mode-2 structure after collision albeit s
 omewhat altered. It is shown that the ratio between the two wave amplitude
 s is crucial in determining the fate of the mode-2 wave after collision.\n
 References \nMagalhaes\, J. M. & da Silva\, J. C. B. 2018 Internal solitar
 y waves in the Andaman Sea: New insights from SAR imagery. Remote Sensing.
  10\, 861\; doi:10.3390/rs10060861\nStastna\, M.\, Olsthoorn\, J.\, Bagala
 enko\, A.\, & Coutino\, A. 2015 Strong mode-mode interactions in internal 
 solitary-like waves. Phys. Fluids. 27\, 046604
LOCATION:Seminar Room 1\, Newton Institute
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