Abstract
The form of sediment attenuation versus depth is varied to study its effects on the bottom reflection coefficient for sand and clay layers. 300 m thick, overlaying a basalt substrate. Constant, linear, modified exponential, and sound-speed-linked dependences of attenuation on depth are input to a plane wave reflection coefficient model and the resulting bottom loss versus grazing angle curves are compared. The form of attenuation versus depth is found to have significant effects (as much as 10 dB at 50 Hz) on bottom loss for sediments with small critical angles and moderate sound speed gradients. Mode attenuation coefficients for the same physical situations gave similar results. [Work supported by the Naval Electronic Systems Command.]
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