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FRICTION SOUND PROBE |
The sediment friction-sound-probe (SED-FSP) tool is used to provide direct, in-situ measures of in the field of the horizontal and vertical extent of grain size. Developed by US Navy scientists under SERDP Project ER-200919, this tool is especially effective for conformational sampling for placement and long-term resiliency of AC remedies that include a sand cover, or for other remedies such as Enhanced Monitored Natural Recovery or conventional sand covers.
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The microphone signal is processed through an on-board electronics interface package and transmitted to recording software. A pneumatic drive unit mounted on an aluminum frame assembly is used to drive the probe into the sediment bed at a controlled speed. Grain size is determined by comparing the acoustic response to responses of prepared sediments of known grain sizes, the calibrations are performed prior to the field deployment.
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SED-FSP profiles from the ER-201368 post-placement monitoring at the Quantico Enhanced Monitored Natural Recovery project. Blue lines and diamonds are the SED-FSP data; orange square symbols (and green for one station duplicate) are measured grain size D50s from the cores collected at these stations. Blue colors indicate native material, green tones indicated mixed zones, and yellow color indicates predominate sand. |
Additional Resources |