Abstract
A rapid in-situ bottom survey technique is needed to provide information about sedimentary structures, boundary roughness and macrofaunal distributions in estuarine, continental shelf and deep sea sediments. We have made preliminary studies using ultrasound imaging as a possible means of providing this kind of information. Our laboratory studies have shown that a high-frequency acoustic backscattering system operated at 1.6 mHz can image the distribution of laminations and tubes in muddy sediments. We compare the acoustic images with radiographs taken from the same sections of the test sediment to demonstrate the accuracy and resolution of the acoustic record. This acoustic technique could be adapted to a towed sled vehicle to provide in-situ high-resolution (⩾ 1 cm) subbottom (0–10 cm) profiles of sedimentary fabrics and possibly biological structures.
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