Abstract
In this modeling study subsurface layering effects on the spatial coherence of bottom-interacting sound were investigated. The ocean bottom was modeled as alternating layers of clay and clayey silt. A silty clay bottom was used as a control. Complex reflection coefficients were calculated using a plane-wave multilayer model [G. J. Fryer, J. Acoust. Soc. Am. 63, 35–42 (1978)]. Using a frequency averaging technique, estimates of the spatial coherence were obtained as a function of grazing angle for fixed sensor separation. The results indicated that subsurface layering can seriously degrade the spatial coherence at frequencies above 100–200 Hz. The spatial coherence is considerably less affected by subsurface layering at very shallow grazing angles (10° or less) or very steep grazing angles (75° or greater). [Work supported by NORDA.]
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