## 2pUW2. Acoustic scattering by a partially buried three-dimensional elastic object.

### Session: Tuesday Afternoon, May 14

### Time: 1:35

**Author: Raymond Lim**

**Location: Coastal Systems Station, Code 130B, Panama City, FL 32407**

**Abstract:**

A formally exact transition-matrix solution for the spectral scattering
response of an elastic object that penetrates a plane-stratified fluid host is
formulated. The field scattered from the segment in each layer is expanded in a
global outgoing basis centered on that segment and these segment fields are
superimposed at the field point. A manageable structure for the transition
matrix is maintained by using the boundary conditions to couple these segment
fields to the interior field of the object via a single exterior surface field
expansion centered on the origin of the object. The standard set of regular
spherical eigenfunctions of the Helmholtz equation are used to expand the
exterior surface field. Numerical tests for an axisymmetric spheroid indicate
this choice yields a viable solution but convergence is better for flattened
shapes (oblate) than elongated shapes (prolate). Examples are presented to
illustrate environmental effects on the backscatter by a bubble and an elastic
spheroid that penetrate a water/sediment interface. [Work supported by ONR.]

from ASA 131st Meeting, Indianapolis, May 1996