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

Transcript of Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand...

Page 1: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

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

Page 2: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

Large Gorgonian Distribution

Coldwater Coral off Newfoundland and Labrador, WWF 2007

Page 3: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

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

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Boundary Layers

Idealized boundary layer

Bottom drag, sea floor roughness important factor

NASA 2008

Page 5: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

Methods

ROPOS/Hudson 2007 Cruise

Survey of deepwater coral

Multiple sites along slope of continental shelf

2008 Dr. Evan Edinger

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ADCP

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Profiler 1: Area without Coral

Dr. Len Zedel / Dr. Evan Edinger, ROPOS 2007

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Current Profiler 2: Coral Thicket

Dr. Len Zedel / Dr. Evan Edinger, ROPOS 2007

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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

Page 10: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

Location of ADCP in Coral Thicket (site 2)

Page 11: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

ROPOS Transact and location of coral

Page 12: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

Mean normalized velocity profile

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Comparison of Site 1 and 2

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Directional Velocity Profile: Inst. 1

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Coral Thicket varies relative to site 1

Page 16: Boundary Layer Velocity Structure in a Coldwater Coral Area of Haddock Channel, Southwest Grand Banks William Fowler MSc. Candidate Environmental Science.

Directional Velocity Profile w/ time series

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Directional subplots Inst. 1 shown (use inst. 2 plots in presentation)