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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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