Abstract
Guided mode propagation in a wedge bounded by the ocean surface and a sloped bottom is modeled in a 80‐kHz experiment conducted in an indoor tank, under controlled conditions. The bottom is simulated by a sand filled tray, 10 m long, 1 m wide, and 20 cm deep. The tray is suspended beneath the water surface, with one end pivoted so as to vary the angle of the wedge from 0°–10°. A vertical line array of seven elements is used as a source to preferentially excite low ordered modes in the waveguide. The field of propagating modes is studied with a probe hydrophone as a function of range and depth in both the water column and the sand sediment. Measurements on mode conversion in propagation out of the wedge are discussed and compared to theory. [Work supported by the Office of Naval Research.]
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