Joseph Park     SLF     Physics     Publications     Ocean Engineering     Oceanography     Acoustics     1979

Acoustic Tracking & Monitoring of the Cape Sable Seaside Sparrow

The Cape Sable Seaside Sparrow is an endangered species whose known habitat is located with Everglades National Park. Since the latter part of the 19th Century an ambitious and widespread effort was undertaken to drain the swamps of South Florida and provide some measure of flood control for urban and agricultural interests. These changes fundamentally altered the natural flow of water to and within the Everglades. Subsequent changes in freshwater habitats and the influence of hurricanes have altered sparrow habitats.

The recent advent of self-contained, multi-channel, GPS-time-synchronized acoustic recorders has made passive acoustic localization feasible. We are using Wildlife Acoustics Songmeters in a 4-element acoustic array configuration to monitor and localize the Cape Sable Seaside Sparrow.

4-element acoustic array
CSSS song spectrogram Coherent cross-correlation processing app

Acoustic Tracking & Characterization of Tornadoes

Research using sensitive atmospheric infrasound sensors developed at the National Center for Physical Acoustics has demonstrated the ability to track and characterize tornadoes and the associated vortex turbulence aloft over distances of 100 km. Higher frequency analysis finds a quantitative link between the acoustic energy and dominant turbulence-eddy length scales, suggesting a method to remotely monitor the dynamics and strength of the storm.

Infrasonic tornado tracking and characterization:
  Journal of the Acoustical Society of America, 135

A 9MB pdf on Tornado Acoustics
Presented at the NOAA OneScience Seminar, May 30, 2012.  

GFPE Model of acoustic propagation at 3 Hz
Stillwater Tornado Acoustic Spectrum CEPG Tornado Acoustic Spectrum

The Rotary Subwoofer: a contollable infrasound source

Acoustic model and measurements:
  Journal of the Acoustical Society of America, 125(4)

IMS array insonification:
  Journal of the Acoustical Society of America, 125(4)

Model for source radiation:   Python code.

Building resonances when driven by the source:   Python Code.

Rotary Speaker, Acoustic Spectrum, Schematic Diagram

Bubble Dynamics and Acoustic Radiation of Plunging Waves

Collective Bubble Oscillations as a Component of Surf Infrasound
  Journal of the Acoustical Society of America 123(5)


Beamforming from a monolithic piezoelectric composite

Active-Control of Acoustic Beamforming with an Electrode Array on a Piezoelectric Rubber Composite
  Journal of the Acoustical Society of America 93(6)