Eric Thorsos         Principal Physicist         Ocean Acoustics Dept.         Applied Physics Laboratory         University of Washington      Kevin Williams         Principal Physicist         Ocean Acoustics Dept.         Applied Physics Laboratory         University of Washington      DJ Tang         Senior Oceanographer         Ocean Acoustics Dept.         Applied Physics Laboratory         University of Washington      Steve Kargl         Senior Physicist         CIMU         Applied Physics Laboratory         University of Washington      Office of Naval Research      CDR Robert Headrick, Code 321OA      Ellen S. Livingston, Code 321OA      Nicholas P. Chotiros, Code 321OA      Kerry W. Commander, Code 321MS      Douglas A. Abraham, Code 321US	One of four 2000-lb clump anchors being deployed at the SAX04 site. There is a clump anchor at each corner of the 60 m by 60 m buried target field. The overall objective of SAX04 is to better understand the acoustic detection at low grazing angles of objects, such as mines, buried in sandy marine sediments. One component of the SAX04 work is designed to collect data and gain a greater understanding of high-frequency sound penetration into, propagation within, and scattering from the shallow water seafloor at a basic research level. A second component is designed to provide data directly on acoustic detections of buried mine-like objects at low grazing angles. Diver beginning burial of large cylindrical target. The diver is using a venturi dredge powered by a high pressure water stream. The sediment is sucked from beneath the target, allowing the target to settle in. One set of targets was buried to a depth of 30 cm below the mean sediment interface; the second set was buried flush with the mean interface. A third set was deployed on the sediment ("proud") during SAX04. Previous work has shown that sound penetration into sandy sediments at low grazing angles is greatly enhanced when ripples are present on the seafloor. This has led to the companion Ripples DRI Experiment. The goal of this work is to better understand the growth, evolution, and decay of ripples on sandy seafloors at shallow water sites. The experiment site for SAX04 is about 1 km offshore in water about 17 m (55 ft) deep south of Fort Walton Beach, Florida. The smaller town of West Destin, Florida, stretches along the beach just south of Fort Walton Beach and the experiment site is just to the south of West Destin. A set of mine-like targets were buried at the experiment site in early May 2004. They were contained within a 60 m by 60 m region, bounded by 30 deg 23.221 min N, 30 deg 23.189 min N, 86 deg 38.660 min W, and 86 deg 38.622 min W. (See the Chirp Sonar Survey, May 2004 for a discussion of the target field site selection.) The SAX04 work extended about 100 m south of the target field, and about 200 m north, east, and west of the target field. Much of the Ripples DRI work was done within the SAX04 area just defined, but some was done outside of it. Instrumentation was deployed for examining ripple evolution in a wider region, including closer to shore. The experimental work began in early September 2004 and extended to the middle of November. Todd Hefner (APL-UW) next to six small cylindrical targets supplied by Ray Lim (NSWC-PC)