Abstract
A major sediment acoustics experiment (SAX04) was conducted near the coast of northwestern Florida, USA during September–November 2004. In addition to our laboratory, a number of other institutions participated, principally from the USA and Canada. SAX04 addressed sound penetration into, propagation within, and scattering from the shallow-water seafloor, as well as scattering from proud and buried targets. The sandy sediment at the experiment site has a critical angle of nearly 30 deg, convenient for study of acoustic penetration into sediments at grazing angles below the critical angle. A shallow-water depth of about 17 m allowed divers to be utilized in many aspects of the experimental work. In particular, divers deployed a 30-m rail system on the bottom for synthetic aperture sonar and other acoustic measurements. SAX99, conducted at a site nearby, showed the importance of scattering from ripples on high-frequency acoustic penetration at subcritical grazing angles. In part because of these findings, a new research initiative on sediment ripple formation, evolution, and decay was begun by ONR, and investigators from this program carried out studies at the SAX04 site. An overview will be given of the SAX04 measurement program. [Work supported by ONR.]
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