Marine and Physical Acoustics Division Overview David L. Bradley 30 April 2013 Center for Acoustics and Vibration
ORGANIZATION AND STAFFING Acoustics Division Ocean Acoustics Department Marine Bioacoustics Department Physical Acoustics Department 8 Research Faculty (Ph.D.) 5 Office Administrators 4 Research Scientist & Assists. 8 Graduate and 1 Undergraduate Students
ACOUSTICS DIVISION How we function 9 Faculty Researchers (Ph.D.) joint faculty Graduate Program of Acoustics 1 Research Scientist (Ph.D.) 2 Research Asst (M.S.) 5 Office Administrator 8 Graduate and 1 Undergrad Students Primary: Individual researchers, PI s for sponsor direct funded programs Secondary: Often combine in 1-3 person teams for joint proposals/tasks frequently, team with external colleagues for similar, larger tasks
ACOUSTICS DIVISION Acoustics Research Areas/Core Competencies ($4M) Ocean Acoustics Seafloor characterization ONR, NSF, SPAWAR Water column characterization ONR Acoustic modeling and simulation ONR Underwater threat neutralization ONR, NUWC Weapon Countermeasures ONR Ocean array experiments ONR, NRL Radiated/self noise ONR, NAWC Marine Bioacoustics Marine mammal/fish studies ONR, Woods Hole Oceanographic Institution Joint Industry Program on the Effects of Industry Sounds on Marine Animals, Int l Oil and Gas Ambient Noise Physical Acoustics Atmospheric infrasonic monitoring arrays Univ. of Miss. (Army) Thermoacoustics ONR, DoE
International Ocean Acoustics - At-Sea Experiments Change Detection and Seafloor Complexity Experiment, HU Sverdrup II Larvik, Norway, 2011 (student: Derek Olson) The ONR FIVE OCTAVE RESEARCH AMiCa-10 (Autonomous Mine Clearance), 2010, Italy ARRAY (FORA) at Penn State (student: Dan Brown) Clutter09 April June 2009, Italy QPE Geoacoustic Uncertainty, June/August 2009, Taiwan TAVEX, 2008, Korea (student: Chad Smith) Clutter07 May-June 2007, Italy Philippine Sea Eng Test 2009 (students: Colin Jemmott, Alex Sell) Boundary 04, May 2004, Italy (student: Tom Weber) National Bering Sea, Acoustic Moorings, 2008-Present (student: Sam Denes) TREX13, May 2013, Panama City, FL Gulf-Ex, Active Sonar Reverberation, May 2012, Panama City, FL Long Range Acoustic Comms Sept 2010, Off San Diego SW06, 2006, New Jersey Shelf (students: Megan Ballard, Joy Lyons, John Camin, Tom Weber) Gulf of Maine Sept 2006, Georges Bank 2006: Scattering Statistics Study, Seneca Lake OREX05, July 2006, Oregon coast CTD Chain
ACOUSTICS DIVISION International Collaboration In addition to PSU and other US Academic & Lab ties, the Division maintains ongoing collaborative efforts internationally: Australia Visiting Scientist AUV G&C Studies Canada Visiting Scientists Geophysical Inversion/ Modeling Germany Visiting Scientist Signal Processing Denmark Visiting Scientist, at-sea exp. Harbor Defense, SAS New Zealand Visiting Scientist Synth. Apert. Sonar (SAS) NURC (NATO Undersea Research Centre) Exchange Scientists, at-sea exp. S/W Propagation, reverberation AUV Studies, Seafloor Scattering Korea At-sea Experiments Shallow Water Propagation France Visiting scientist/students Seafloor Characterization
The Division National Ties
Characterizing Acoustic Backscatter in the Bering Sea during a Temporary Ice Retreat February 17 March 4 March 11 March 20 St. Matthew Island St. Matthew Island St. Matthew Island St. Matthew Island
Ice and Marine Mammals 100 90 80 70 60 50 40 30 20 10 Percent Cover (%) Ice Thickness (cm) Bowhead presence Walrus presence Bearded seal presence Ribbon seal presence 0-20 0 20 40 60 80 100 120 140 160 180 200 Year Day 2009
Seabed Structure at the Meso-scale AUV Results expected to shed light on reverberation and clutter in bottom-limited areas Design: ARL-PSU/NURC Built: NURC with Un. Victoria Sources: 800 1400 Hz 1600-3500 Hz xducers in flooded towbody Receiver 1m spacing, 32 phones, first phone ~10 aft of source
Fairbanks, Support AK Army s Comprehensive Test Ban Treaty Monitoring Stations Completed: July 2009 INFRASONICS Infrasound Monitoring Station Calibrations: Sites Completed: May 2009 Newport, WA Winnipeg, MB Scheduled: September 2009 TBG
TBG Infrasound Monitoring Station Calibrations: Portable Wind-Noise Reduction Array
OCEAN ENVIRONMENT CHARACTERIZATION Synthetic Aperture SONAR Forward Modeling and Inversion 2D to 3D Synthetic Aperture Sonar Knowledge of how scattering strength varies as a function of angle allows one to go from a Synthetic Aperture SONAR intensity image to a seafloor height map Height (m) Distance (m)