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Exploring Puget Sound Tides & Currents with the . Acoustic Doppler Current Profiler (ADCP) Paul A. McWilliams. Presentation Outline. Tides (Sat & Fri) Predicted Currents The ADCP Data Samples Contours Profiles Questions. Saturday May 8 Spring Ebb Range=13.3ft Low 2:07 AM 7.2

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exploring puget sound tides currents with the

Exploring Puget Sound Tides & Currentswith the

Acoustic Doppler Current Profiler (ADCP)

Paul A. McWilliams

Paul McWilliams – Ocean 101

Spring 2004

presentation outline
Presentation Outline
  • Tides (Sat & Fri)
  • Predicted Currents
  • The ADCP
  • Data Samples
    • Contours
    • Profiles
  • Questions

Paul McWilliams – Ocean 101

Spring 2004

tides for 8 14 may 2004
Saturday May 8

Spring Ebb

Range=13.3ft

Low 2:07 AM 7.2

High 6:53 AM 10.4

Low 2:17 PM -2.9

High 10:04 PM 11.5

Maximum Ebb ~10:36AM

Friday May 14

Neap Flood & LHW

Tidal Range=5.2ft

High 2:33 AM 11.1

Low 9:10 AM 2.8

High 3:10 PM 8.0

Low 8:33 PM 3.5

Max Flood ~12:13pm

Tides for 8 &14 May, 2004

Paul McWilliams – Ocean 101

Spring 2004

ebb tide sat
Ebb Tide (Sat)

Expected Flow

  • North in central Puget Sound
  • South from Possession Sound
  • West Through Admiralty Inlet

Paul McWilliams – Ocean 101

Spring 2004

flood tide fri
Flood Tide (Fri)

Expected Currents

  • East through Admiralty Inlet
  • South in Central Sound
  • North in Possession Sound

Paul McWilliams – Ocean 101

Spring 2004

current predictions
Saturday May 8

Stronger Currents

Northward Flow during Ebb Tide

Westward Flow in the near Edmonds

Friday May 14

Weaker Currents

Southward flow during Flood Tide

Current Predictions

Paul McWilliams – Ocean 101

Spring 2004

acoustic doppler current profiler adcp
Acoustic Doppler Current Profiler (ADCP)
  • Uses compression and expansion of reflected sound-waves to measure the movement of particles in the water
  • Requires significant Processing power-Microprocessors Make Possible
  • Must take Ship’s Motion into account (GPS)

Paul McWilliams – Ocean 101

Spring 2004

adcp limitations
ADCP Limitations
  • Cannot “see” bottom 15% of Water Depth or Near Surface
    • Backscatter
    • Surface Noise
  • GPS Precision—Ship’s Pitch and Roll not Accounted For

Paul McWilliams – Ocean 101

Spring 2004

three types of displays
Three Types of Displays
  • Contour
  • Detail Contour
  • Profile

Paul McWilliams – Ocean 101

Spring 2004

6 types of data
6 Types of Data
  • Direction
  • Magnitude
  • North Velocity
  • East Velocity
  • Error
  • Vertical

Paul McWilliams – Ocean 101

Spring 2004

gps navigation processing
GPS Navigation Processing

Friday PM leg Contours without and with (bottom) Navigation Processing

Paul McWilliams – Ocean 101

Spring 2004

direction contours
Direction Contours

Sat (Top)

versus

Fri (Bottom)

Color Code:

Magenta=North

Blue=East

Green=South

Orange=West

Paul McWilliams – Ocean 101

Spring 2004

magnitude contours
Magnitude Contours

Saturday (top)

Versus

Friday (bottom)

Color Code:

Magnitude (mm/s)

Red=700

Blue=0

Paul McWilliams – Ocean 101

Spring 2004

north velocity
North Velocity

Saturday (top)

Versus

Friday (Bottom)

Color Code:

Warm=“+”or N

Cool=“–”or S

+/-700mm/s

Paul McWilliams – Ocean 101

Spring 2004

east velocity
East Velocity

Saturday (top)

Versus

Friday (Bottom)

Color Code:

Warm=“+”or E

Cool=“–”or W

+/-700mm/s

Paul McWilliams – Ocean 101

Spring 2004

profile examples max ebb
Profile Examples-Max Ebb
  • Saturday
  • Taken @ West Point
  • 10:36am

Velocity

Green”+”=N

Red”+”=East

Paul McWilliams – Ocean 101

Spring 2004

profile examples max flood
Profile Examples-Max Flood
  • Friday
  • Taken @ Edmonds
  • 12:13pm

Velocity

Green”+”=N

Red”+”=East

Paul McWilliams – Ocean 101

Spring 2004

profile examples friday cast 3
Profile Examples-Friday Cast 3
  • Friday
  • Taken @

ORCA 2

  • 3:40pm

(high slack)

Velocity

Green”+”=N

Red”+”=East

Paul McWilliams – Ocean 101

Spring 2004

questions
Questions?

For More Information:

http://students.washington.edu/paulmcqm/ocean_cruise.htm

Paul McWilliams – Ocean 101

Spring 2004

conclusions
Conclusions
  • Predictions seems accurate
    • ADCP seems to work
    • Currents are strongly tide based
  • Point Wells seems okay for discharge
  • Need to look at
    • full range of tides
    • Storm conditions

Paul McWilliams – Ocean 101

Spring 2004

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