240 likes | 353 Views
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. Named Waves Tracked Alfred Betty Carlton Debby Elvin Florence George Holly
E N D
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
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
approaching wave train – < 5 kt winds view from flying bridge
group-group interactions wave-wave interactions Tonya / wave group interaction
SW37 SW38 SW39 SW40
Oops! accidental sound source 02 August 2006 23:04:54
high turbulence at interface interfacial jets?
Varicose wave Jasmine
Seafloor pressure measurements of nonlinear internal waves, submitted to J.Phys.Oceanogr., December 2006 (Moum & Nash)
Emily Shroyer Knorr Shoaling nonlinear internal waves: transition from depression to elevation waves. in prep, J.Phys.Oceanogr. (Shroyer, Moum & Nash) Knorr
Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter
Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter pre-wave state
Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 1200 kHz backscatter
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.
Wave Florence pre-wave state
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