Measurement and Modeling of Low Frequency Acoustic Wave Propagation and Scattering in Shallow Water with Comprehensive Subbottom Structure Measurements.
Final rept. 1 Oct 92-30 Sep 95,
MIAMI UNIV FL INST OF MARINE AND ATMOSPHERIC SCIENCES
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A high resolution acoustic crosswell tomography technique was developed for accurate measurements of variabilities of density, velocity, shear strength and permeability within the sediments. An analytical expression for the three dimensional wave number spectra of these sediment properties has been obtained. Acoustics scattering from sediment volume has been obtained as a function of the three dimensional spectra of velocity and density variabilities. Work continues to quantify the relation between the variabilities of sediment properties and acoustic bottom scattering. A method to measure the ocean wave directional spectra using a single buried ocean bottom seismometer and a pressure senser has been developed and sea tested successfully.