Defence Research and Development Canada Recherche et développement pour la défense Canada Canada DRDC Aspects of SW06 – 2007 Workshop Sean Pecknold, Paul Hines, John Osler, Victor Young, and Dale Ellis Maritime Environmental Awareness Group, DRDC Atlantic 31 January, 2007

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Outline Data acquired –Propagation loss –Swath bathymetry –FFCPt –WBS and WARBL Data needed Anticipated output/collaborative efforts Other results

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Propagation loss Sources –MSM –Shipboard projector CWs, 200 Hz 1.2 and 3 kHz Receivers –2 GPS enabled SBs –Moored UAT – 8 h/p between 22 m and 51 m depth – 24kHz sampling rate

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Propagation loss runs

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Local measurements Next Figure 2000 m Reson kHz, 120 metre range 240 cross-track beams (0.5º) 1º along-track beam width 6 mm depth resolution DGPS, Gyro, pitch-roll-heave Pole mount on Quest Hull mounted EdgeTech X-Star Chirp Profiler (2-16 kHz)

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique

Multiple drop FFCPT transects seabed and water column measurements

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Initial scattering results from SW06 SW06 Energy Time Series – in process of calibration Strataform Scattering Strength Result Hines et al., (2005)

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Wide Angle Reflection and Bottom Loss Bottom loss is the angle-fitted source level, calculated from direct arrival, minus received level minus theoretical transmission loss from a perfectly reflecting bottom (technique of Holland and Osler, 2000). BL = SL - RL - TL RECEIVER  DIRECT SOURCE  BOTTOM REFLECTED Range Time 1-12 kHz source

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Data needed Sensor data from moorings (23 July – 2 August) Shipboard met data, CTDs/XBTs (available on DVD) Other acoustic data from 25 July – 2 August; ambient noise and propagation (available from WHOI) MSM source levels Sediment acoustic properties –Chirp runs along propagation paths/WBS area (Turgut) –Sediment mapping (Miller) Roughness measurements (IMP) in APL-UW area (Tang) Core data from FFCPt drop areas for comparison

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Anticipated output/collaborative efforts Scattering strengths and roughness, with Tang Analysis of WARBL data for bottom loss at varying angles and comparison w. Dahl Comparison of FFCPt measurements to inversion results (Chapman and others) Propagation sensitivity to oceanographic and geoacoustic parameters, with Dosso (UVic) Improvement of model predictions based on REA – 2007 Maritime Acoustic Symposium (CFMWC/METOc)

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique Other results Successful REA operation with reachback to DRDC Auralization data from BBN targets In-air vs. in-water sound levels for Convair flyover Ship noise levels

Defence R&D Canada – Atlantic R & D pour la défense Canada – Atlantique The Defence Research and Development Branch provides Science and Technology leadership in the advancement and maintenance of Canada’s defence capabilities.