Abstract
A 1:7500 scale underwater acoustic propagation experiment was conducted in a laboratory tank to investigate three-dimensional (3D) propagation effects, with the objective of providing benchmark quality data for comparison with numerical models. A computer controlled positioning system accurately moves the receiving hydrophone in 3D space while a stationary source hydrophone emits band-limited pulse waveforms between 200 kHz and 1 MHz. The received time series can be post-processed to estimate travel time, transmission loss, and vertical and horizontal arrival angle. Experimental results are shown for a 1.22 × 2.13 m bathymetric part possessing both a flat bottom bathymetry and a translationally invariant wedge with a 10° slope. Comparisons between the experimental data and numerical models are also shown. [Work supported by ONR.]
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