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Deep Ocean Relocation Project Phase II: Sensors and System Architecture for Monitoring of Dredged Material Relocation to the Abyssal Seafloor (CD-ROM)
Authors: Philip J. Valent; David K. Young; Albert W. Green; Donald C. Rhoads; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS |
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Abstract: ELECTRONIC FILE CHARACTERISTICS: 25 Adobe Acrobat PDF files. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 63.5 MB. SYSTEMS DETAIL NOTE: Requires Adobe Acrobat Reader. ABSTRACT: This collection of reports documents a one year effort to identify sensors, sensor support platforms, sensor deployment strategies, and data recovery methods that could be used for monitoring potential contaminant leakage from dredged material placed on the deep ocean floor. A temporally tiered monitoring plan identifying salient physical, chemical, and biological parameters needed for assessing the effectiveness of containing contaminated dredged material is presented. The time/space scales of impacts are predicted by modeling the dispersion of sediment and contaminants during disposal operations and postdepositional transport of chemical species. Detailed descriptions are given of candidate sensors for measuring geosynthetic fabric container (GFC) descent and impact and the release of sediment plumes and pore waters. Laser line scan systems for mapping the dredged material footprint over time, using either monochromatic light or dual mode fluorescence imaging of pollutants or fluorescent tracers, are described. Sensors for measuring the physical and chemical signature of dredged material are presented. Two biosensors are described that show promise for making in situ measurements of benthic metabolism and fluxes of pollutants across the sediment-water interface. The use of special strains of barophilic, cold-adapted, luminous bacteria as in situ indicators of the presence of xenobiotic chemicals is outlined. Included is a global sensor search that resulted in a listing of over 40 sensors/samplers for meeting monitoring requirements. Lastly, an overall design of an integrated sensor system is presented including deployment platforms, baseline navigation nets, methods of tracking and controlling sensors, and the collection and transmission of data to surface vec
| Description: |
Memorandum rept. |
| Pages: |
1 |
| Report Date: |
08 FEB 2001 |
| Report Number: |
M242100 |
Report Unavailable |
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