Abstract
A series of scattering measurements from buried and proud spheres in the NRL shallow-water laboratory have been conducted in order to understand the scattering of sound from targets at and below the sandy-bottom interface. The water-saturated sandy bottom was a manufactured 212-μm washed and filtered sand. The initial measurements included scattering from two spheres, a solid aluminum sphere with a 15-cm diameter, and a hollow stainless steel sphere with a 60-cm diameter and an h/a of 0.05. For baseline measurements, free-field and proud measurements of both spheres were made. Buried measurements of the spheres ensonified below the critical angle were conducted with a smoothed interface to quantify contributions from the evanescent wave field. Also investigated is the enhancement due to a roughened sand–water interface. The results of these measurements will be discussed and a preliminary analysis will be presented. [Work supported by ONR.]
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