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Wave-tracking Experiment to Assess NLIW Generation, Structure, Evolution and Dissipation Detection of NLIW by Seafloor Pressure Measurement bottom landers.

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Presentation on theme: "Wave-tracking Experiment to Assess NLIW Generation, Structure, Evolution and Dissipation Detection of NLIW by Seafloor Pressure Measurement bottom landers."— Presentation transcript:

1 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 Moum

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 MoumOSU Alexander PerlinOSU Greg AvicolaOSU Emily ShroyerOSU Sam KellyOSU Mike Neeley-BrownOSU Ray KrethOSU Karen FisherLos Alamos Dezhang ChuWHOI Doris LeongDalhousie Paul HeslingaFalmouth Academy

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

4 Mika

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

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

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

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

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

16 Wave Florence

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22 Florence time/position diagram mean propagation speed 0.90 ms -1 Florence’s speed projected backward in time 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 pre-wave state Wave Florence

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

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