boundary layer velocity structure in a coldwater coral area of haddock channel, southwest grand...
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Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks
William Fowler
MSc. Candidate Environmental Science
Memorial University of Newfoundland
Large Gorgonian Distribution
Coldwater Coral off Newfoundland and Labrador, WWF 2007
Characterization of Local Current Regime Corals occurring on the
bottom in deep water are located in the benthic boundary layer
Layer extends above seafloor anywhere from 5-20 meters
Dr. Len Zedel / Dr. Evan Edinger, ROPOS 2007
Boundary Layers
Idealized boundary layer
Bottom drag, sea floor roughness important factor
NASA 2008
Methods
ROPOS/Hudson 2007 Cruise
Survey of deepwater coral
Multiple sites along slope of continental shelf
2008 Dr. Evan Edinger
ADCP
Profiler 1: Area without Coral
Dr. Len Zedel / Dr. Evan Edinger, ROPOS 2007
Current Profiler 2: Coral Thicket
Dr. Len Zedel / Dr. Evan Edinger, ROPOS 2007
Deployment Parameters
Depth 700 meters 1 profile every 30 seconds Uncertainty in velocity time series ~ 0.5 cm/s Profiling over 4 meters 1 meter cell size
Location of ADCP in Coral Thicket (site 2)
ROPOS Transact and location of coral
Mean normalized velocity profile
Comparison of Site 1 and 2
Directional Velocity Profile: Inst. 1
Coral Thicket varies relative to site 1
Directional Velocity Profile w/ time series
Directional subplots Inst. 1 shown (use inst. 2 plots in presentation)