Field Feasibility Study on the Use of Existing Commercially Available Instrumentation to Detect Fine-Scale (< or = 1 mm) Bottom Elevation Changes: Currituck Sound, North Carolina
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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This is the second in a series of two technical notes that evaluate the capability of the Lindorm Inc. SediMetertrademark. The SediMeter utilizes infrared optical backscatter OBS detectors to determine the location of the seariverlake bottom. The previous technical note ERDC TN-DOER T11, Perkey and Wadman 2013 presented results of laboratory tests performed to assess the instrument s accuracy. That technical note concluded that the SediMeter was not able to reliably record bed elevation changes on the scale of 1mm. However, that technical note further stated that in areas where dredged material may be impacting bottom elevations on larger scales such as beneficial use of dredged material to build marsh land, the SediMeter might serve as a useful monitoring instrument. This document will present results from field deployment and testing of the SediMeter performed on the USACE Field Research Facility FRF property in Currituck Sound, North Carolina. In addition to the SediMeter, the SeaTek Multiple Transducer Array MTA and the Nortek Vectrino II Acoustic Doppler Velocimeter ADV were also deployed and tested in Currituck Sound. Both of these instruments utilize high-frequency acoustic signals to determine the location of the bottom with an advertised resolution of 1 mm or less. Results of the tests conducted with these instruments will also be presented to assess their feasibility for monitoring fine-scale sedimentation that might occur as a result of particles settling out of dredge plumes.
- Hydrology, Limnology and Potamology
- Test Facilities, Equipment and Methods