ADCP: White ADCP: White Point SwashPoint Swash

Amanda BettingerAmanda BettingerLindsay KarpinskiLindsay Karpinski

John Henry FrancisJohn Henry FrancisMatt DunsmoreMatt Dunsmore

Nick FischerNick FischerMSCI 311MSCI 311

December 7, 2007December 7, 2007

What is an ADCPWhat is an ADCP Acoustic Doppler Acoustic Doppler

Current ProfilerCurrent Profiler Measures wave and Measures wave and

current velocities current velocities and direction and direction through the through the specified water specified water column using an column using an acoustic signal.acoustic signal.

Eularian system Eularian system (measures at one (measures at one point over time)point over time)

Workhorse Sentinel ADCP

Study Site: White Point Study Site: White Point SwashSwash

ADCP Location

Study Site: White Point Study Site: White Point SwashSwash

ADCP Location

ADCP Set upADCP Set up

Prior to the deployment the ADCP Prior to the deployment the ADCP had to be configured in the set up had to be configured in the set up software and loaded onto the software and loaded onto the machine.machine.

The ADCP had to be tested prior to The ADCP had to be tested prior to deployment to ensure that all deployment to ensure that all function are working properly.function are working properly.

ADCP configurationADCP configuration

Blanking distance: 0.15 m (15 cm)Blanking distance: 0.15 m (15 cm) Bin size: 0.05 m (5 cm)Bin size: 0.05 m (5 cm) Sampling Frequency: 1 Hz, every 5 Sampling Frequency: 1 Hz, every 5

minsmins Deployed: 10/18/07 12:54 pm for 31 Deployed: 10/18/07 12:54 pm for 31

daysdays Pulse Coherent Mode (mode 11)Pulse Coherent Mode (mode 11)

ADCP Deployment ADCP Deployment InformationInformation

The ADCP was deployed in an The ADCP was deployed in an aluminum frame approximately 0.5 aluminum frame approximately 0.5 m x 0.5 m held down by 2 lead m x 0.5 m held down by 2 lead weights approx 50 lbs each.weights approx 50 lbs each.

The frame was buried in slightly The frame was buried in slightly under 0.5 m of sediment, under 0.5 m of sediment, approximately ¾ of the frame was approximately ¾ of the frame was buried.buried.

TroubleshootingTroubleshooting

The ADCP was originally deployed for a The ADCP was originally deployed for a 3 day period for testing purposes.3 day period for testing purposes.

Problems that were encountered Problems that were encountered include:include: It was not in the proper modeIt was not in the proper mode

Bottom Tracking was needed to recognize the Bottom Tracking was needed to recognize the surfacesurface

The surface was not being recognized by The surface was not being recognized by the instrumentthe instrument

Rods were bend/ broken that may have Rods were bend/ broken that may have caused movementcaused movement

Data ProcessingData Processing

The WinADCP program was used to The WinADCP program was used to export the data from the binary file export the data from the binary file to a convenient text file that can be to a convenient text file that can be loaded into Matlab.loaded into Matlab.

ProfilesProfiles

Data Analysis: Temperature Data Analysis: Temperature and Depthand Depth

Data Analysis: Magnitude Data Analysis: Magnitude and Direction of Velocitiesand Direction of Velocities

Data Analysis: Velocity Data Analysis: Velocity DirectionDirection

Further AnalysisFurther Analysis

Discharge rates can be calculated Discharge rates can be calculated using the magnitude and direction of using the magnitude and direction of the velocity.the velocity.

A similar procedure can be done to A similar procedure can be done to look at seasonal variability of the look at seasonal variability of the tidal influence and discharge rates.tidal influence and discharge rates.