Sector-Scanning Sonar Imagery of Laboratory Bedforms

Thursday, 18 December 2014
Kyle O'donnell Olejniczak1, Joseph Calantoni2, Allison Penko2, Margaret L Palmsten2, Alexandru Sheremet3, James Michael Kaihatu4 and Robert Weiss5, (1)California State University Monterey Bay, Seaside, CA, United States, (2)Naval Research Laboratory, Stennis Space Center, MS, United States, (3)University of Florida, Engineering School for Sustainable Infrastructure and Environment, Gainesville, FL, United States, (4)Texas A&M University, College Station, TX, United States, (5)Virginia Tech, Blacksburg, VA, United States
High-frequency (2.25 MHz) Sector-Scanning Sonar (SSS) provides low-cost imagery for observing bedform morphology. SSS data can be used to improve upon bedform morphology models and correct for acoustic scattering and absorption of the seafloor. We collected SSS data at a 3.0 m range over six days in the large wave flume at the O.H. Hinsdale Wave Research Laboratory at Oregon State University. SSS data were averaged over the number of scan passes for each experiment. Experiments were conducted using solitons, as well as cnoidal and random waves with varying wave heights and periods from 0.25 m to 1.0 m and 2.0 to 5.0 seconds, respectively. Waves propagated over an 8 m long sediment test section containing Oregon beach sand with D50 = 0.23 mm. Ripple wavelengths were estimated using Fourier analysis and ranged from 0.41 m to 1.2 m.