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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, bu is functionally similar. Modifications include more efficient 'Inner Frame Guides', less complicated 'Lifting Frame', lighter weight, and smaller overall dimensions.

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.

Slide 1.Inner Instrument Frame Up

Slide 2.Inner Instrument Frame Down

Slide 3.SSMS Major Components

Slide 4.ISSAMS Ready for Deployment

Slide Show Explanation

The slide show presentation shows the basic steps in the operation of the SSMS system.

Slide 1. SSMS in its landed position on the ocean floor with instrument frame up.
Slide 2. A hydraulic cylinder is activated, and the instrument cage is lowered.
Slide 3. Major components of the SSMS system.
Slide 4. A view of ISSAMS ready to be deployed.

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

CLICK ON THIS LINK TO VIEW AN ARTICAL ABOUT ISSAMS WRITTEN BY SEAN R. GRIFFIN, DR. FRANCIS B. GROSZ JR., AT ONMI TECHNOLOGIES, and DR. MICHAEL E.RICHARDSON AT NAVAL RESEARCH LAB.