Marine sediment acoustic measurement system |
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| Authors: | Kenneth C Baldwin Barbaros Celikkol Armand J Silva |
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| Institution: | 1. Department of Ocean Engineering, University of Rhode Island, Kingston, RI 02881, U.S.A.;2. Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, U.S.A.;3. Departments of Ocean and Civil Engineering, University of Rhode Island, Kingston, RI 02881, U.S.A. |
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| Abstract: | This paper describes a system that has been developed to measure compressional wave speed in cored marine sediments onboard ship. The structure enables one to secure an extruded core sample to its base and to move acoustic probes to a desired location, implant them to a specified depth into the sample and perform the measurement. The acoustic measurement system is a pulse-time delay system measuring time difference over a fixed path length and the temperature of the sediment. The time difference and temperature measurement systems are comprised of task oriented components and are housed in a single portable box. The system is adaptable to the various sample sizes obtained with the coring apparatus presently in use. Initial field tests indicate that ship motion has no effect on the system. Data collected from cores has been classified according to sediment type and displays good agreement with data presented by Hamilton (1970). The difference in compressional wave velocity, based on sediment type, for the two studies is 5 m per sec. |
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