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In Situ Seabed Sediment Measurement System (SSMS)

ISSAMS (In Situ Sediment Geoacoustic Measurement System) was originally designed for ocean floor research conducted by the Naval Research Laboratory at Stennis SpaceCenter, MS. It was later used by OMNI Technologies in Kenner, LA for more ocean floor research. ISSAMS was used to rapidly measure the geotechnical and geoacoustic properties of the ocean floor by measuring compressional and shear wave velocity and attenuation, temperature, depth, and near bottom water conductivity. Ocean floor geotechnical and geoacoustic properties are needed for numerous scientific and military applications. SSMS (In Situ Subsea Measurement System) is an updated version of ISASAMS, but is functionally similar. Modifications include more efficient 'Inner Frame Guides', less complicated 'Lifting Frame', lighter weight, and smaller overall dimensions. FOLLOW THIS LINK TO SEE A VIDEO OF SSMS IN MOTION.

SSMS is first lowered to the ocean floor. A hydraulic cylinder is then activated which lowers an inner cage and inserts shear and compression wave sensing probes into the ocean floor. After the data has been recorded, the hydraulic cylinder is reversed, the inner cage raises and the shear and compression probes are retracted.



The image above shows the major components of the Suspended Sediment Measurement System (SSMS), which is a modified version of the original In Situ Sediment Geoacoustic Measurement System (ISSAMS). A Sea Technology article about ISSAMS is given on the right side of this page.

ISSAMS Construction

ISSAMS was constructed at Stennis Space Center, MS because the head of the Geo- Acoustics and Geo-Techniques section, Dr. Michael Richardson, needed it for his research project.

Dr. Richardson's research interests included the effects of biological and hydrodynamic processes on sediment structure, properties, and behavior. Recent research has been directed toward in situ measurement and predication of seaflor geo- acoustic properties.

Link to Sea Technology Article about ISSAMS

Click on the image below to view an article about ISSAMS, the precursor to SSMS, written by Sean R. Griffin and Dr. Francis B. Grosz Jr. at OMNI Technologies, and Dr. Michael E. Richardson at the Naval Research Lab

ISSAMS Article Link