1 / 24

Investigating Nonlinear Internal Wave Dynamics Through Seafloor Pressure Measurements

This research explores the generation, structure, evolution, and dissipation of nonlinear internal waves (NLIW) through a comprehensive wave-tracking experiment aboard R/V Oceanus. Utilizing high-resolution pressure sensors deployed on the seafloor, various waves including those named Mika, Jasmine, and Florence were tracked. The study aims to understand wave interactions, energetics, and pressure signatures while focusing on the transition of wave states. Results contribute to advancing oceanographic knowledge and enhancing predictions regarding internal wave behavior.

lotte
Télécharger la présentation

Investigating Nonlinear Internal Wave Dynamics Through Seafloor Pressure Measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Moum • Wave-tracking Experiment to Assess NLIW • Generation, Structure, Evolution and Dissipation • Detection of NLIW by Seafloor Pressure Measurement bottom landers with high-res pressure sensors

  2. Named Waves Tracked • Alfred • Betty • Carlton • Debby • Elvin • Florence • George • Holly • Isaac • Jasmine • Kevin • Lola • Mika • Natalie • Oscar • … • Anya NLIWI/SW06 R/V Oceanus 30 July – 26 Aug 2006 Science Party Jim Moum OSU Alexander Perlin OSU Greg Avicola OSU Emily ShroyerOSU Sam Kelly OSU Mike Neeley-Brown OSU Ray Kreth OSU Karen Fisher Los Alamos Dezhang Chu WHOI Doris Leong Dalhousie Paul Heslinga Falmouth Academy

  3. approaching wave train – < 5 kt winds view from flying bridge

  4. Mika

  5. group-group interactions wave-wave interactions Tonya / wave group interaction

  6. SW37 SW38 SW39 SW40

  7. Oops! accidental sound source 02 August 2006 23:04:54

  8. high turbulence at interface interfacial jets?

  9. Shipboard profiling measurements

  10. Varicose wave Jasmine

  11. Seafloor pressure measurements of nonlinear internal waves, submitted to J.Phys.Oceanogr., December 2006 (Moum & Nash)

  12. Emily Shroyer Knorr Shoaling nonlinear internal waves: transition from depression to elevation waves. in prep, J.Phys.Oceanogr. (Shroyer, Moum & Nash) Knorr

  13. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter

  14. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter pre-wave state

  15. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 1200 kHz backscatter

  16. Wave Florence

  17. Wave Florence

  18. Wave Florence

  19. Wave Florence

  20. Wave Florence

  21. Wave Florence

  22. Florence time/position diagram mean propagation speed 0.90 ms-1 Florence’s speed projected backward in time Wave Florence We project the measured locations of the wave backward in space/time using the wave speed determined from the slope of the wave’s x-t plot to get an idea of what/where the wave was before it was clearly a wave. The result is the pre-wave state indicated several slides previous to this. This is helping us to decide what to look for in the generation region.

  23. Wave Florence pre-wave state

  24. Summary Topics of Interest • wave pressure signature – submitted (Moum/Nash) • shoaling / sign change – in prep. (Shroyer/Moum/Nash) • physical structure – interfacial jets? • energetics: evolution / transport / dissipation • generation: bore / wave transition • varicose waves • wave-wave / group-group interactions

More Related