ISSAMS: An In situ Sediment Acoustic Measurement System

摘要

An In Situ Sediment Acoustic Measurement System (ISSAMS) has been designed andtested for measurement of near surface sediment geoacoustic properties in water depths up to 200 m. Shear wave velocity is measured over pathlengths of 33 and 71 cm at a sediment depth of 30 cm. Compressional wave velocity and attenuation is measured over 58 and 1 00 cm pathlengths at sediment depths of 10, 20, and 30cm. Preliminary tests that have lead to the current design are described to justify the current measurement configuration. System characteristics are presented and a strategy for further development and improvement of the ISSAMS system is outlined. Representative data collected from the Adriatic Sea are presented and compared to laboratory and seismic measurements. These results demonstrate the accuracy and usefulness of ISSAMS.