HR: 1330h
AN: OS52A-0895    [PDF]
TI: Comparison of Floc Sizes From a LISST-100 and a Digital Floc Camera
AU: * Mikkelsen, O A
EM: mikkelseno@mar.dfo-mpo.gc.ca
AF: Department of Fisheries and Oceans, Bedford Institute of Oceanography, Dartmouth, NS B3A 2T6 Canada
AU: * Mikkelsen, O A
EM: mikkelseno@mar.dfo-mpo.gc.ca
AF: Dalhousie University, Department of Oceanography, Halifax, NS B3H 4J1 Canada
AU: Chant, R
EM: chant@imcs.rutgers.edu
AF: Rutgers University, Institute of Marine and Coastal Sciences, New Brunswick, NJ 08901 United States
AU: Hill, P S
EM: Paul.Hill@dal.ca
AF: Dalhousie University, Department of Oceanography, Halifax, NS B3H 4J1 Canada
AU: Milligan, T G
EM: milligant@mar.dfo-mpo.gc.ca
AF: Department of Fisheries and Oceans, Bedford Institute of Oceanography, Dartmouth, NS B3A 2T6 Canada
AB: A LISST-100 in situ laser particle sizer was deployed together with a digital floc camera (DFC) in estuarine and continental shelf settings on several occasions. The LISST-100 can measure particle sizes in the range 2.5-500$\mu$m, whereas the DFC can detect particles larger than 125$\mu$m; the two instruments thus overlap in the 125-500$\mu$m size range. The particle sizes from the two instruments are compared. At a first glance, the LISST-100 underestimates the floc median diameter (D$_{50}$) by a factor of 2-4 when compared to the DFC. However, when the data from the two instruments are "trimmed", so that only particles in the overlapping size ranges are considered, the two instruments yield nearly identical values for D$_{50}$. Thus, the LISST-100 and the DFC both appear to detect particles in their overlapping size ranges correctly. Since the DFC only detects particles larger than 125$\mu$m, it will usually overestimate D$_{50}$, whereas the LISST-100 will usually underestimate D$_{50}$. Using the two instruments in conjunction, floc size spectra from 2.5$\mu$m and up can be measured, hence better estimates of the D$_{50}$ can be obtained.
DE: 3022 Marine sediments--processes and transport
DE: 3094 Instruments and techniques
DE: 4219 Continental shelf processes
DE: 4235 Estuarine processes
DE: 4558 Sediment transport
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting