Acoustic boundary wave generation and shadowing at a seamount.
Abstract
The interaction of a sound field and a seamount has been
studied by physically modeling the ocean surface over 2
dimensional and 3 dimensional models of Dickens Seamount.
By using a smooth ocean surface, and one with a surface of
scaled Rayleigh roughness to model a 35 knot wind, the
relative contributions are determined for off-axis scattering
elements, multiple reflection from the ocean surface, and
diffraction over the crest of the seamount.
Boundary wave generation over a randomly rough plane surface
is studied experimentally. The ratio of boundary wave
amplitude to volume wave amplitude is found to be proportional to (frequency) ³/² and (range) ¹/² and the ratio of the empirical
scattering parameter to the rms height of the roughness
elements is found to be approximately 0.3. The spatial correlation
length of the randomly rough surface takes the place
of the center-to-center separation of the hemispherical bosses
used in Tolstoy's theoretical treatment.
Rights
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