1. Low to Mid frequency propagation through Internal Waves during SW06 experiment M. Badiey B. Katsnelson J. Lynch

2. Objectives 3D effects of environment on the broadband propagation Establish different regimes of propagation, adiabatic, horizontal refraction, mode coupling Azimuthal dependency of the field due to IW propagation Geoacoustic inversion

3. Experimental Layout Sea floor Water depth ~80m ~1000 lb anchor WHOI VLA Thermistor string G 56 G 34 J15-3 SMH 0.3m 0.4m Variable range (5 to 40 km) Ship winch

4. Source: J15-3 –Freq. range: 20-600 Hz –Long range Source: Three G34s –Frequency range: 1-3 KHz –Short range Sound sources

6. Low freq. band (<600Hz) from J15-3 –LFM or chirps –Sinc pulse –CW at multiple freq. points –M-sequence Middle freq. band (1-3 KHz) with three sources G34s –LFM –BPSK Signals Tested

7. MSM, NRL 300Hz NRL 500Hz WHOI 224Hz WHOI 400Hz WHOI VLA/HLA SHARK 08021205 – 08021439 08040620 - 08041300 08050715 - 08051809 08060645 - 08061730 08062327 - 08070224 08030320 - 08030842 08092327 - 08100900 08080838 - 08090724 A1 B1A B1 B1B C5A B5A A5A A3 B3 C1D 08071715 - 08080600 C1A C1C 08120900 - 08121735 08131030 - 08140710 J15: 79.3m 08141030 - 08141830 J15: 75m 08161146 - 08170610 J15: 50m C3 08101320 - 08110913 08052210 - 08060710 J15: 40.3m 08052210 - 08060710 UD-L: 40m R/V HUGH R. SHARP ACOUSTIC RECEPTIONS C1B

9. Sample of received signal on the receiver array

10. Direction of dominant IW regimes observed during 21 days.

12. Tracks for Geoacoustic Inversion

14. Towed CTD data taken from the web for 8/9/06

16.  ww ss usus uwuw Surface Clutter NORTH VLA Source path IW “crests” Source

24. 145015001550160016501700 0 10 20 30 40 50 60 70 80 Depth (m) CTD#143CTD#144 Messured SSP Event#29 Geotime (Local)