Task Overview

Contacts:

Industry Challenge: Pilot testing for tidal turbine developers has been costly and time-consuming, often due to the burdens imposed by regulatory monitoring. This has partly resulted from gaps in knowledge and understanding between developers and regulatory agencies and has contributed to delays, unrealistic expectations on both sides, and costly measurements that impair the economics of demonstration and commercial systems. Conversations between UW, device and site developers, and regulatory agencies indicate that this is a global concern and is not locale-specific.

Approach: The Center proposes to develop a modular and scalable instrumentation package for cost-effective environmental and performance monitoring for in-stream turbines. This package will be developed through in-water testing and will be aligned with international standards. The relatively deep water and high velocities at tidal energy sites represent a distinct departure from traditional oceanography and will require new approaches and new thinking. The primary goal is to address environmental and performance concerns in a cost-effective manner that meets the needs of developers, regulators, and researchers. The Center will test instrumentation options for:

  • Measuring device performance in sheared, turbulent flows.
  • Quantifying the structure of flow around turbines including turbulence, shear, and device wake.
  • Measuring noise, both ambient and device generated.
  • Monitoring of fish and marine mammals.

A key goal during the first few years will be to establish guidelines for efficient measurement protocols which package multiple, complimentary diagnostics into a single ship-mounted or bottom-mounted platform.

This task will engage the technical and creative capabilities of the Applied Physics Laboratory, Oceanography, and Mechanical Engineering. APL's involvement brings to bear significant equipment and measurement capabilities (e.g. ADCP and ADV), as well as the potential to exploit overlap with other concurrent projects. An example of this is airborne infrared measurements to characterize estuarine dynamics. Center personnel will be involved in the creation of standards for device testing. Development of the tidal energy instrumentation package at UW will leverage the experience of the Center's industrial partners and be trialed in conjunction with industry-led device testing in the Puget Sound.

The guiding principle is to allow site and device developers to build-out wherever they find compelling reasons to do so. This will allow developers to test devices and collect high quality data where there is long-term potential for commercial facilities.

Outcomes and Impacts:

  • Research: Evaluation of physical and biological characteristics of sites with naturally occurring high speed flows.
  • Industry: Guidelines for cost-effective monitoring of operations for tidal turbines; Guidance on siting in turbulent flows with respect to performance and fatigue life.
  • Regulatory: Guidance for statutory monitoring programs.

Instrumentation Development

The Center and its partners are involved in the testing and development of instrumentation packages for site and device characterization.

Instrumentation Tripod

NNMREC has integrated a number of instruments into a single package to collect data that serve to characterize the physical and biological environment at tidal energy sites. Instruments are mounted to a Sea Spider fiberglass tripod, which has been ballasted with over 600 pounds of lead. This has been sufficient to hold the tripod in place in Admiralty Inlet, WA, where it is being trialed as part of Snohomish PUD's tidal energy project. The tripod is deployed using a weight bearing acoustic release and recovered by one of two redundant acoustic releases connected to floats and retrieval lines.

In addition to data collection the tripod has also led to productive collaborations with WA Dept. of Ecology and NOAA Fisheries, whereby their instrumentation has been deployed on the tripod by NNMREC.

The current tripod instrumentation consists of:

  • Acoustic Doppler Current Profiler - measurements of velocity
  • CTDO - measurements of conductivity, temperature, depth, and dissolved oxygen (provided by WA Dept. of Ecology)
  • Recording hydrophone - measurements of underwater noise
  • Fish tag receiver
  • Chelonia TPOD and CPOD - measurements of cetacean echolocation (primarily porpoise and dolphin)
  • Sediment trap

The first generation tripod was deployed in Admiralty Inlet, WA from April, 2009 until August 2010. During this time there have been several useful lessons learned:

  • Individual deployments should not exceed 3 months, due to corrosion concerns and fouling of instrumentation.
  • Single batch 316 stainless steel fastners are preferred. The use of nylock nuts in lieu of a nut and lock washer is not recommended. During the initial deployment, approximately 50% of nylock hardware coroded to the point of near-failure after a single month in the water. During instrumentation turn-around, changing out any fastner which is beginning to develop corrosion is recommended.
  • Instrumentation should be secured redundantly (e.g., bolts + seine twine) - mounting points will fail occasionally in high current environments during extended deployments.


The second generation tripods have been deployed in Admiralty Inlet, WA since August 2010 and have been performing well. Refinements to the second generation tripods include>
  • Reinforced fiberglass frame capable of support additional ballast (800 lbs total);
  • Transmit and receive acoustic releases; and
  • Modular instrumentation mounts.

Infrared Detection of Marine Mammals

As part of DOE-funded project to characterize the physical and biological environment in Admiralty Inlet, WA, the efficacy of a land-based infrared (IR) camera to detect marine mammals is being tested. The primary advantage of an IR camera over a conventional camera is the potential ability to detect marine mammals on the surface during the night. Because water vapor is opaque to both the visual and infrared spectrum, the IR camera will not perform better than a conventional camera during periods of fog or rain. Additionally, for sea states greater than 3 of the Beaufort scale, wave crests create many false detections.

An initial test of the IR camera was conducted at Lime Kiln State Park in cooperation with the Whale Museum and Beam Reach. The videos below demonstrate the effectiveness of the IR cameras under ideal conditions and are visually striking. Both were obtained during the middle of the night when a conventional camera would be ineffective.

Publications:

Resource Characterization

UW-NNMREC has developed a characterization toolbox to interpret and analyze Doppler profiler data. This toolbox may be used to evaluate resource characteristics and generate a preliminary estimate for turbine performance given design specifications and a particular site.

Release Notes:

  • November 20, 2011 - Initial public release
  • November 1, 2012 - Modified effect of off-axis flows on turbine performance to match revisions to Polagye and Thomson (in press).

Performance between a fixed and passive/active yaw turbine at a site in Admiralty Inlet

Automatic Identification System (AIS)

UW-NNMREC maintains an Automatic Identification System (AIS) receiver at the historic lighthouse on Admiralty Head (Fort Casey State Park). AIS transponders are required on all vessels over 300 tons gross weight and passenger vessels, but a number of recreational and research vessels carry transponders, as well. These are principally used by the US Coast Guard for real-time collision avoidance and traffic control, but the signals can be logged and used to provide context for other measurements (e.g., background noise). AIS operates on VHF side bands and the receiver has a line of sight effective range of greater than 30 miles. While vessels are underway, they broadcast their MMSI number, location, speed, and heading. They also periodically transmit description information (e.g., flag, draft, length).


AIS ship tracks from northern Admiralty Inlet (June 2010). Blue tracks are the passenger ferry. The red triangle is the proposed locations for Snohomish Public Utility District's tidal energy pilot project.

A receiver and logging system is relatively inexpensive and easy to assemble. The entire system consists of:

  • AIS receiver (class A and B signals, e.g., Comar AIS-2-USB ~$400)
  • AIS antenna (e.g., Shakespeare 5250-AIS ~$100)
  • Low-cost desk top computer with upgraded hard disk storage (~$600)
  • Misc. cables (e.g., USB, ethernet ~$30)

The receiver logs approximately 5 MB of ship traffic each day. To access the UW-NNMREC AIS archive for Admiralty Inlet, please contact Chris Bassett.

Tidal Micropower for Instrumentation

Stand-alone oceanographic measurements at tidal energy sites are typically constrained by either the power available from battery systems or storage space for recorded data. As a practical matter, the storage constraint also comes back to available power since battery constraints drive the use of low-power, limited storage media (e.g., compact flash cards). UW-NNMREC has been developing a compact (<1 m2 swept area) vertical axis tidal turbine intended to supply 10-20 W continuously through a rechargeable battery bank. The micropower turbine could be integrated with a Sea Spider package, as shown conceptually in the figure below.

Figure - Conceptual Sea Spider with integrated energy harvesting

This concept has been advanced by graduate student research and an undergraduate Capstone design team. Rotor design and characterization has been completed and emphasis is now turning towards the implementation of the power train and control system.

Publications:

  • Brian Polagye, Rob Cavagnaro, and Adam Niblick, Micropower from Tidal Turbines, ASME Fluids Division Summer Meeting, July 8-11, 2013, Incline Village, NV.
  • Brian Polagye, Rob Cavagnaro, Adam Niblick, Taylor Hall, Jim Thomson, and Alberto Aliseda, Cross-flow Turbine Performance and Wake Characterization, Proceedings of the 1st Marine Energy Technology Symposium, April 10-11, 2013, Washington, DC.
  • Josh Anderson, Bronwny Hughes, Celestine Johnson, Nick Stelzenmuller, Leonardo Suntanto, and Brett Taylor, Design and Manufacture of a Cross-Flow Helical Tidal Turbine, Undergraduate Capstone Project Report, 2011


Site Data

Data and analysis generated by these activities may be found on task subpages accessed through navigational panel. Due to intellectual property considerations, the release of some project data may require consultation with Center partners.

Admiralty Inlet, Washington

The goal of this project is presently to collect baseline data required for permitting of a pilot scale tidal energy array in Admiralty Inlet.

Surveys conducted to date - click on links to view full survey information and data

Shipboard Surveys Bottom Deployments

April 2009 (Shipboard)

This was the initial survey of Admiralty Inlet aboard the R/V Jack Robertson. Many pieces of equipment were evaluated and the Sea Spider was deployed for two days as a test deployment, recovered successfully, and re-redeployed for extended measurements.

Readying Sea Spider for initial deployment

  • Duration: April 6-9, 2009
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, background noise, water quality, hydroacoustics, ROV video
  • Summary Report: Forthcoming
  • Cruise Pictures (1): Picasa Web Album
  • Cruise Pictures (2): Picasa Web Album
  • Cruise Pictures (3): Picasa Web Album
Study Type Download Link Description
Velocity April 6-9, 2009 (28 tracks) .zip archive (44 MB)
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
Hydroacoustics Contact Brian Polagye for access to data Hydroacoustic measurements for fish and marine mammal abundance
Water Quality Casts April 7, 2009 (2 casts) .mat file (1.3 MB)
File header (.txt)

Quantities measured:
  • Salinity
  • Temperature
  • Dissolved oxygen
  • pH
  • Turbidity
  • Chlorophyll
Background Noise Recording 1: ambient noise .wav (8 MB)
Recording 2: shipping traffic .wav (8 MB)
Contact Chris Bassett for access to raw data
Study of background noise levels at various locations in Admiralty Inlet
ROV Video
Video collected during ROV survey at two sites of different depths within the survey area.
  • The depth of the survey is indicated by the number in the bottom middle of the display (e.g., 077.0MS = 77 meters).
  • The shallower site (60m) has a relatively uniform, cobbled seabed.

    Near the end of the survey, the ROV is being pulled along the seabed by its umbilical (power and coms) as the R/V Jack Robertson is being pulled by the current.
  • The deeper site (80m) has a more irregular seabed, with cobbles, shells, and larger rock outcrops

    The green cable seen near the end of the footage is the ROV umbilical line (power and coms).

    The yellow object is a pencil in the ROV grab arm for scale.
Surface Conditions Conditions on the surface in Admiralty Inlet during the cruise.
  • At times, the surface gives no indication of the speed of the currents.
  • In other cases, the action of the currents around the headland are pronounced.

May 2009 (Shipboard)

This survey was primarily structured to recover the Sea Spider, add new instrumentation, and redeploy it within the project area. During this time, shipboard ADCP measurements and water quality samples were also obtained.

  • Duration: May 19-20, 2009
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity and water quality
  • Summary Report: Forthcoming
  • Cruise Pictures (1): Picasa Web Album
  • Cruise Pictures (2): Picasa Web Album
Study Type Download Link Description
Velocity May 19-20, 2009 (16 tracks) .zip archive (22 MB)
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
Water Quality Casts May 19, 2009 (2 casts) .mat file (0.8 MB)
File header (.txt)

Quantities measured:
  • Salinity
  • Temperature

August 2009 (Shipboard)

This survey repeated most of the measurements made during April, recovered the Sea Spider, further upgraded the instrumentation package, and redeployed the package.

  • Duration: August 3-5, 2009
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water quality, background noise, ROV video
  • Summary Report: Forthcoming
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity August 3-5, 2009 (30 tracks) .zip archive (34 MB)
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
Water Quality Casts August 3-5, 2009 (4 casts) .mat file (1.6 MB)
File header (.txt)

Quantities measured:
  • Salinity
  • Temperature
  • Dissolved oxygen
  • pH
  • Chlrophyll
  • Turbidity
Background Noise Contact Chris Bassett for access to data Study of background noise levels at various locations in Admiralty Inlet
ROV Survey Video collected during ROV survey in approximated 60m of water.
  • The depth of the survey is indicated by the number in the bottom middle of the display (e.g., 077.0MS = 77 meters).
  • In general, the site is relatively flat and dominated by small cobbles.

    A spiny crab and shrimp are visible. There is also an old power cable associated with Fort Casey briefly visible near the end of the clip.

November 2009 (Shipboard)

This survey repeated the standard suite of measurements, recovered the Sea Spider, serviced instrumentation, and redeployed the package. A drifting spar buoy was also deployed to assist in measurements of ambient noise.

  • Duration: November 10-12, 2009
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water quality, background noise
  • Summary Report (.pdf 200 kB)
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity Contact Brian Polagye for access to data Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
Water Quality Casts November 10-11, 2009 (9 casts) .mat file (3.7 MB)
File header (.txt)

Quantities measured over entire water column:
  • Salinity
  • Temperature
  • Dissolved oxygen
  • pH
  • Chlrophyll
  • Turbidity
Background Noise Contact Chris Bassett for access to data Study of background noise levels at various locations in Admiralty Inlet

February 2010 (Shipboard)

This survey repeated the standard suite of measurements, recovered the Sea Spider, serviced instrumentation, and redeployed the package. A drifting spar buoy was also deployed to assist in measurements of ambient noise. Due to corrosion on the titanium arms on the tripod releases, instrumentation package was delayed by approximated 12 hours while the currents worked the recovery line shackles free of the release arms.

  • Duration: February 9-11, 2010
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water quality, background noise
  • Summary Report (.pdf 200 kB)
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity Contact Brian Polagye for access to data Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
Water Quality Casts February 9, 2010 (2 casts) .mat file (400 kB)
File header (.txt)

Quantities measured over entire water column:
  • Salinity
  • Temperature
  • Dissolved oxygen
  • pH
  • Chlrophyll
Background Noise Contact Chris Bassett for access to data Study of background noise levels at various locations in Admiralty Inlet

May 2010 (Shipboard)

This survey involved minimal shipboard operations, the primary purpose being the retrieval and redeployment of the sea spider instrumentation package. A number of racetrack velocity surveys were conducted to further resolve ebb amplitude variations. A larger tripod to characterize turbulence was also deployed off Marrowstone Island.

  • Duration: May 3-6, 2010
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Measurements: Velocity
  • Summary Report (.pdf 200 kB)
  • Cruise Pictures: Forthcoming
Study Type Download Link Description
Velocity Contact Brian Polagye for access to data Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity

August 2010 (Shipboard)

The cruise was dedicated to the retrieval of the existing Sea Spider and deployment of two 2nd generation Sea Spiders with upgraded instrumentation and infrastructure.

  • Duration: August 17-18, 2010
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report (.pdf 150 kB)
  • Cruise Pictures: Picasa Web Album


November 2010 (Shipboard)

The cruise was dedicated to the retrieval and redeployment of the two Sea Spiders in northern Admiralty Inlet.

  • Duration: November 8-10, 2010
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report (.pdf 150 kB)
  • Cruise Pictures: Picasa Web Album
  • Cruise Videos

Study Type Download Link Description
Water Quality Casts November 8, 2010 (1 cast) .mat file (0.2 MB)
File header (.txt)

Quantities measured:
  • Salinity
  • Temperature
  • Dissolved oxygen
Background Noise Contact Chris Bassett for access to raw data Test of "hairy rope" faring to reduce flow noise

February 2011 (Shipboard)

During this cruise, two Sea Spiders were recovered and redeployed in northern Admiralty Inlet. Additionally, a third Sea Spider was deployed for a shorter duration at same location, a turbulence moorig was deployed at Marrowstone Island, and acoustic surveys were conducting in collaboration with Pacific Northwest National Laboratory.

  • Duration: February 10-13,21 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report (.pdf 1.1 MB)
Study Type Download Link Description
Acoustic Survey Contact Chris Bassett for access to raw data Study of background noise levels in general project area

May 2011 (Shipboard)

During this cruise, two Sea Spiders were recovered and redeployed in northern Admiralty Inlet. Additionally, four instrumentation packages were deployed in northern Admiralty Inlet to evaluate the effectiveness with which various hydroacoustic sonars detect, classify, and identify fish species. During this cruise, velocity surveys were conducted to better resolve spatial gradients in the project area and acoustic surveys were undertaken in collaboration with Pacific Northwest National Laboratory.

  • Duration: May 8-11 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report (.pdf 0.8 MB)
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity Survey Contact Michael Palodichuk for access to raw data Figure 8 pattern passing over Doppler profilers on Sea Spiders. Subsequent analysis concluded that this is not an effective survey strategy due to the presence of turbulence in survey tracks.
Acoustic Survey Contact Chris Bassett for access to raw data Study of background noise levels in general project area

June 2011 (Shipboard)

During this cruise, the four instrumentation packages used to evaluate the effectiveness with which various hydroacoustic sonars detect, classify, and identify fish species were recovered. Additionally, velocity surveys were conducted to better resolve spatial gradients in the project area and acoustic surveys were undertaken in collaboration with Pacific Northwest National Laboratory.

  • Duration: June 8-9 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report (.pdf 0.8 MB)
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity Survey Contact Michael Palodichuk for access to raw data Sequential station-keeping over Doppler profilers on Sea Spiders
Acoustic Survey Contact Chris Bassett for access to raw data Study of background noise levels in general project area

August 2011 (Shipboard)

During this survey, three Sea Spiders (SS #02-#04) were recovered and SS #02 and SS #03 were redeployed at alternative turbine sites, further from a communications cable. Additionally, a sound propagation test was conducted to evaluate the directivity of sound propagation at this location. This will help to establish the context for measurements of post-installation turbine noise.

  • Duration: August 9-11 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report: Forthcoming
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Velocity Survey Contact Michael Palodichuk for access to raw data Sequential station-keeping over Doppler profilers on Sea Spiders
Acoustic Survey Contact Chris Bassett for access to raw data Study of sound propagation in the vicinity of proposed turbines

November 2011 (Shipboard)

During this survey, two Sea Spiders were recovered and one was redeployed to continue long term data collection in the project area. A sound velocity profiler was also benchmarked against a Seabird SBE 37 CTD.

  • Duration: November 14-15 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Summary Report: forthcoming
  • Cruise Pictures: Picasa Web Album
Study Type Download Link Description
Sound Profiles SVP data (.mat 50 kB)
SBE37 data (.mat 4kB)
Sound speed profiler casts with a Valeport MiniSVP and SeaBird SBE37

May 2012 (Shipboard)

During this survey, one Sea Spider was recovered and redeployed for continued, long-term monitoring of the project area. This Sea Spider had been deployed for seven months at the time of recovery and was encrusted with an impressive degree of biofouling.

  • Duration: May 29, 2011
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Cruise Pictures: Picasa Web Album

August 2012 (Shipboard)

The primary purpose of this survey was the field testing of the stereo camera system developed to characterize fisheries interactions with tidal turbines. The camera system was positioned on a tow frame with targets at 2.5, 3.5, or 4.5 m distance from the cameras and lowered to approximate turbine hub height in Admiralty Inlet. In addition, the frame was towed at up to 2 m/s to simulate operating conditions as part of a tidal energy project.

In addition, vessel-based resource characterization surveys were conducted on four ebb and flood tides (greater tides on two days) to characterize alternative locations for turbine deployment. Alternative sites were closer to shore and, while high-resolution numerical modeling indicated that they would be as energetic as the currently proposed locations, they fall within the extent of the flood eddy that forms to the lee of Admiralty Head. The surveys were, however, able to identify a region with potentially higher power density at the intersection of the ebb and flood eddies. A Sea Spider was deployed at this location to characterize the tidal resource, including collecting information about turbulence.

  • Duration: August 13-16, 2012
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)

September 2012 (Shipboard)

This cruise recovered two Sea Spiders and redeployed one. One recovered Sea Spider (SS #02) showed signs of damage upon recover, primarily the destruction of the flow shields on the recording hydrophones. In addition, the tripod was recovered ~70 m away from its as deployed location. Analysis of ADCP gyro and backscatter data supports the hypothesis that a kelp ball became lodged on the tripod for approximately 4 days in late July.

In addition, a turbulence mooring was deployed for a two day test. Blow down angles were higher than during similar tests in weaker currents during June 2012, but the mooring performed well and was deployed and recovered without incident.

  • Duration: September 19-20, 2012
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)
  • Cruise Pictures: Picasa Web Album

December 2012 (Shipboard)

This cruise recovered and redeployed one Sea Spider. The recording hydrophone was damaged upon recovery (metal fatigue at bulkhead connector), but the system recorded sound for the entire deployment. Minimal biofouling, excepting a colony of 30+ snails in a cluster on the inner surface of one tripod leg.

  • Duration: December 17-18, 2012
  • Survey Type: Shipboard survey
  • Survey Platform: R/V Jack Robertson (University of Washington, Applied Physics Lab)

April 2009 (Test Deployment)


Sea Spider outfitted with ADCP, recording hydrophone, and CTD sensor

  • Duration: April 6-8, 2009
  • Survey Type: Stationary survey (test deployment)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, background noise, water depth, temperature
  • Sea Spider Construction and Testing: Picasa Web Album

Study Type Download Link Description
Velocity ADCP data (.mat 8.4 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Recordings of background noise at Sea Spider deployment depth
Pressure and Temperature Logger data (.mat 40 kB)
Header information
Time series of water pressure and temperature

April - May 2009 (Stationary Deployment)

  • Duration: April 9-May 18, 2009
  • Survey Type: Stationary survey (40 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature
Study Type Download Link Description
Velocity ADCP data (.mat 8.6 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise No data Hydrophone not enabled during deployment
Pressure, Salinity, and Temperature Logger data (.mat 80 kB)
Header information
Times series of temperature, salinity, and pressure
Pressure and Temperature Logger data (.mat 100 kB)
Header information
Time series of water pressure and temperature

May - August 2009 (Stationary Deployment)

  • Duration: May 20-August 3, 2009
  • Survey Type: Stationary survey (75 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data (.zip 271 MB)
ADCP data (velocity only) (.mat 200 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Pressure, Salinity, and Temperature Logger data (.mat 560 kB)
Header information
Times series of temperature, salinity, and pressure
Pressure and Temperature Logger data (.mat 100 kB)
Header information
Time series of water pressure and temperature
Echolocations Contact Jim Thomson or Brian Polagye for access to data Chelonia TPod recording porpoise echolocation events
Fish Tags Detection data (.txt 3 kB) VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

August - November 2009 (Stationary Deployment)

  • Duration: August 5-November 11, 2009
  • Survey Type: Stationary survey (98 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags

Study Type Download Link Description
Velocity ADCP data (.mat 87 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Pressure, Salinity, and Temperature Logger data (.mat 600 kB)
Header information
Times series of temperature, salinity, and pressure
Pressure, Salinity, Temperature, and Dissolved Oxygen Logger data (.mat 637 kB)
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen
Echolocations Contact Jim Thomson or Brian Polagye for access to data Chelonia CPod (digital) and TPod (analog) recording porpoise echolocation events
Fish Tags Detection data (.txt 1 kB) VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

November - February 2010 (Stationary Deployment)

  • Duration: November 12, 2009 - February 9, 2010
  • Survey Type: Stationary survey (89 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags

Study Type Download Link Description
Velocity ADCP data (.zip 189 MB)
ADCP data (velocity only) (.mat 132 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data

Orca vocalization at 1450 on 1/2/10
(.wav format, vocalization at end of clip)
Hydrophone recording background noise at 80 kHz sampling rate
Pressure, Salinity, and Temperature Logger data (.mat 400 kB)
Header information
Times series of temperature, salinity, and pressure
Pressure, Salinity, Temperature, and Dissolved Oxygen Logger data (.mat 466 kB)
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen
Echolocations Contact Jim Thomson or Brian Polagye for access to data Chelonia CPOD (digital) and TPOD (analog) recording porpoise echolocation events
Fish Tags No detections during this deployment VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

February - May 2010 (Stationary Deployment)

  • Duration: February 12, 2010 - May 4, 2010
  • Survey Type: Stationary survey (82 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags

Study Type Download Link Description
Velocity ADCP data (.zip 124 MB)
ADCP data (velocity only) (.mat 104 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Pressure, Salinity, and Temperature Logger data (.mat 237 kB)
Header information
Times series of temperature, salinity, and pressure
Pressure, Salinity, Temperature, and Dissolved Oxygen Logger data (.mat 536 kB)
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen
Echolocations Contact Jim Thomson or Brian Polagye for access to data Chelonia CPOD (digital) and TPOD (analog) recording porpoise echolocation events
Fish Tags No detections during this deployment VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

May - August 2010 (Stationary Deployment)

  • Duration: May 6, 2010 - August 17, 2010
  • Survey Type: Stationary survey (103 days)
  • Survey Platform: Sea Spider (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - Site A (.mat 147 MB)
ADCP data - Site B (.mat 70 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Beam correlation
  • Backscatter intensity
  • Instrument configuration
  • Tripod moved ~90m to NW from original deployment location on day 64 of deployment during a turbulent burst which elevated near seabed velocities to greater than 2.8 m/s. "Site A" is all data up to this movement. "Site B" is all data after this movement.
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Pressure, Salinity, and Temperature Instrument did not deploy correctly Times series of temperature, salinity, and pressure
Pressure, Salinity, Temperature, and Dissolved Oxygen Logger data (.mat 512 kB)
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen
Echolocations Contact Jim Thomson or Brian Polagye for access to data Chelonia CPOD (digital) and TPOD (analog) recording porpoise echolocation events
Fish Tags Detection data (.txt 3 kB) VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

August - November 2010 (Stationary Deployment)

  • Duration: August 18, 2010 - November 8, 2010
  • Survey Type: Stationary survey (82 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Primary deployment - 55m water depth at probable turbine deployment location
    Secondary deployment - 30m water to the northwest of Admiralty Head
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - Primary deployment (.mat 253 MB)
Header information


ADCP data - Secondary deployment (.mat 104 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
  • Primary deployment - 2 hydrophones (coherent)
  • Secondary deployment - 1 hydrophone
Pressure, Salinity, Temperature, and Dissolved Oxygen Pending analysis by WA Dept. of Ecology
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen (primary deployment)
Echolocations Contact Jim Thomson or Brian Polagye for access to data Echolocation events from marine mammals
  • Primary deployment - CPOD (digital) and TPOD (analog - porpoise only)
  • Secondary deployment - CPOD (digital)
Fish Tags No detections on either primary or secondary deployment VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

November 2010 - February 2011 (Stationary Deployment)

  • Duration: November 10, 2010 - February 10, 2011
  • Survey Type: Stationary survey (83 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 55m water depth at probable turbine deployment location
    Sea Spider #03 - 47m water depth directly beneath ferry lanes
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags, photosynthetically active radiation (PAR)
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 145 MB)
Header information


ADCP data - SS #02 (3 second ensembles) (.mat 349 MB)
Header information


ADCP data - SS #03 (1 minute ensembles) (.mat 167 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
  • SS #02 - 2 hydrophones (coherent)
  • SS #03 - 1 hydrophone
Pressure, Salinity, Temperature, and Dissolved Oxygen Pending analysis by WA Dept. of Ecology
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen (primary deployment)
Echolocations Contact Jim Thomson or Brian Polagye for access to data Echolocation events from marine mammals
  • SS #02 - CPOD (digital) and TPOD (analog - porpoise only)
  • SS #03 - CPOD (digital)
Fish Tags VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment
PAR Very, very dark. Contact Brian Polagye for access to data Photosynthetically active radiation sensor (Wetlabs PARSB)

February 2011 (Stationary Deployment)

  • Duration: February 11, 2011 - February 21, 2011
  • Survey Type: Stationary survey (10 days)
  • Survey Platform: Sea Spider #04 (55m water depth) (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, underwater noise, sediment size distribution, echolocations, fish tags
Study Type Download Link Description
Velocity Contact Jim Thomson for access to data
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Bottom Velocity Contact Jim Thomson for access to data S4 electromagnetic current meter measuring velocity within 1 m of seabed
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate with and without flow shields
Echolocations Contact Brian Polagye for access to data Test various instrument configurations for four CPODs
Fish Tags No detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment
Sediment size distribution Sediment data (.zip 14 MB) Sediment size distributions measured by Sequoia Instruments LISST (provided by Sandia National Laboratory)

February - May 2011 (Stationary Deployment)

  • Duration: February 13, 2011 - May 9, 2011
  • Survey Type: Stationary survey (85 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 55m water depth at probable turbine deployment location
    Sea Spider #03 - 50m water depth in traffic separation zone between northbound and southbound traffic lanes
  • Measurements: Velocity, water depth, salinity, temperature, underwater noise, echolocations, fish tags, photosynthetically active radiation (PAR)
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 280 MB)
Header information


ADCP data - SS #03 (1 minute ensembles) (.mat 210 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
  • SS #02 - 2 hydrophones (coherent)
  • SS #03 - 1 hydrophone
Pressure, Salinity, Temperature, and Dissolved Oxygen Pending analysis by WA Dept. of Ecology
Header information
Times series of temperature, salinity, pressure, and dissolved oxygen (primary deployment)
Echolocations Contact Jim Thomson or Brian Polagye for access to data Echolocation events from marine mammals
  • SS #02 - CPOD (digital) and TPOD (analog - porpoise only)
  • SS #03 - CPOD (digital)
Fish Tags No detections on either SS #02 and SS #03 VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment
PAR Very, very dark. Contact Brian Polagye for access to data Photosynthetically active radiation sensor (Wetlabs PARSB)

May-June 2011 (Stationary Deployment)

  • Duration: May 9, 2011 - June 8, 2011
  • Survey Type: Stationary survey (30 days)
  • Survey Platform: Sea Spider #04 (55m water depth) (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity Contact Jim Thomson for access to data
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
Fish Tags No detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

May-August 2011 (Stationary Deployment)

  • Duration: May 11, 2011 - August 9, 2011
  • Survey Type: Stationary survey (90 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 59m water depth at turbine site 1
    Sea Spider #03 - 61m water depth at turbine site 2
    Sea Spider #04 - 61m water depth at backup turbine site
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 275 MB)
Header information


ADCP data - SS #03 (1 minute ensembles) (.mat 220 MB)
Header information


ADCP data - SS #04 (1 s ensembles) Contact
Jim Thomson for access to data
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 1516 and TPOD (analog - porpoise only)
  • SS #03 - CPOD S/N 1148
  • SS #04 - CPOD S/N 1295, 1517, 1518
Fish Tags Contact Joe Talbert for access to data VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

August-November 2011 (Stationary Deployment)

  • Duration: August 11, 2011 - November 14, 2011
  • Survey Type: Stationary survey (96 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
    Sea Spider #03 - 58m water depth at turbine site 2a
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 275 MB)
Header information


ADCP data - SS #03 (1 minute ensembles) (.mat 230 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718 and TPOD (analog - porpoise only)
  • SS #03 - CPOD S/N 1148
Fish Tags No detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

November 2011-May 2012 (Stationary Deployment)

  • Duration: November 15, 2011 - May 29, 2012
  • Survey Type: Stationary survey (196 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 540 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718 and TPOD (analog - porpoise only)
Fish Tags No detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

June-September 2012 (Stationary Deployment)

  • Duration: June 12, 2012 - September 19, 2012
  • Survey Type: Stationary survey (99 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
    Sea Spider #03 - 58m water depth at alternative turbine site (30 days)
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 300 MB)
Header information


ADCP data - SS #03 (1 minute ensembles) (.mat 53 MB)
Header information

Raw data sampled at 1 Hz - contact Jim Thomson or Brian Polagye for access to data.
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718 and TPOD (analog - porpoise only)
  • SS #03 - CPOD S/N 1148
Fish Tags SS #02 - multiple detections - Contact Joe Talbert for access to data VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

September-December 2012 (Stationary Deployment)

  • Duration: September 20, 2012 - December 17, 2012
  • Survey Type: Stationary survey (88 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 267 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 80 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718 and 1148 and TPOD (analog - porpoise only)
Fish Tags SS #02 - multiple detections Vemco data (1 kB) VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

December 2012-April 2013 (Stationary Deployment)

  • Duration: December 18, 2012 - April 1, 2013
  • Survey Type: Stationary survey (104 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 308 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 60 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718
Fish Tags SS #02 - multiple detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

April-July 2013 (Stationary Deployment)

  • Duration: April 2, 2013 - July 1, 2013
  • Survey Type: Stationary survey (90 days)
  • Survey Platform: Sea Spiders (University of Washington, Applied Physics Lab)
    Sea Spider #02 - 54m water depth at turbine site 1a
  • Measurements: Velocity, water depth, underwater noise, echolocations, fish tags
Study Type Download Link Description
Velocity ADCP data - SS #02 (1 minute ensembles) (.mat 201 MB)
Header information
Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity
  • Velocity (u, v, w)
  • Free surface elevation
  • Backscatter intensity
  • Instrument configuration
  • Instrument failed in early June due to battery connector damage
Background Noise Contact Chris Bassett for access to data Hydrophone recording background noise at 60 kHz sampling rate
Echolocations Contact Brian Polagye for access to data Echolocation events from marine mammals (CPOD)
  • SS #02 - CPOD S/N 718
Fish Tags SS #02 - multiple detections VEMCO fish tag hydrophone recording unique fish tags in close proximity to deployment

Marrowstone Island, Washington

The waters off Nodule Point on Marrowstone Island (southern Admiralty Inlet) are relatively shallow (20 m depth) with moderate currents (peak velocities of around 2 m/s). While the site is not of commercial interest for first generation tidal energy devices, conditions are similar to those at more energetic sites. This provides an at-sea location to test various instrumentation systems before committing them to the higher energy environments in northern Admiralty Inlet.

The location has been proposed for a demonstration of a small array of Verdant Power turbines by the US Navy and Verdant Power, but that project is currently on-hold pending availability of funding. Similarly, UW-NNMREC has suggested this location might be suitable as an at-sea tidal energy test platform, but that effort is also on-hold pending availability of funding.

  • Location: Puget Sound, Washington Map of Project Area
  • Site Developer: None
  • Device Developer: None
  • Dates: May 2010 - Present

Surveys conducted to date - click on links to view full survey information and data

Shipboard Surveys Bottom Deployments

May 4-22, 2010

  • Duration: May 4-22, 2010
  • Survey Type: Stationary survey (18 days)
  • Survey Platform: Tidal Turbulence Tripod (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, salinity, temperature

The purpose of this deployment, a collaboration between UW-NNMREC and PNNL, was to collect data suitable for quantification of turbulence at tidal energy sites. This is not possible with the relatively long ensembles (1 minute) typically used for site characterization activities. A Doppler velocimeter (ADV) and Doppler profiler (ADCP) were deployed simultaneously to assess the capabilities of each type of instrument for turbulence measurements. Both pieces of instrumentation were deployed by divers on a 4.5 m tall tripod ballasted by 1.5 tons of steel.

Figure - Tidal Turbulence Tripod Figure - Comparison between ADCP and ADV turbulence metrics ( higher res)
Study Type Download Link Description
Velocity (Doppler velocimeter) Contact Jim Thomson for access to data
Acoustic Doppler Velocimeter (ADV) measurements of three dimensional velocity at a point
  • 6 MHz Nortek Vector
  • Velocity (u, v, w)
  • 4.6 m above seabed
  • 32 Hz (64 seconds every 10 minutes)
Velocity (Doppler profiler) Contact Jim Thomson for access to data Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity throughout the water column
  • 600 kHz RDI Workhorse
  • Velocity (u, v, w)
  • 2 Hz (64 seconds every 30 minutes)
Pressure, Salinity and Temperature Contact Jim Thomson for access to data Times series of temperature, salinity, and pressure

February 10-27, 2011

  • Duration: February 10-27, 2011
  • Survey Type: Stationary survey (14 days)
  • Survey Platform: Tidal Turbulence Tripod (University of Washington, Applied Physics Lab)
  • Measurements: Velocity, salinity, temperature

The purpose of this deployment, a collaboration between UW-NNMREC and PNNL, was to collect data suitable for quantification of turbulence at tidal energy sites. A Doppler velocimeter (ADV) and Doppler profiler (ADCP) were deployed simultaneously to assess the capabilities of each type of instrument for turbulence measurements. Both pieces of instrumentation were deployed on a 4.5 m tall tripod ballasted by 1.5 tons of steel and equiped with an acoustic release.

Study Type Download Link Description
Velocity (Doppler velocimeter) Contact Jim Thomson for access to data
Acoustic Doppler Velocimeter (ADV) measurements of three dimensional velocity at a point
  • 6 MHz Nortek Vector
  • Velocity (u, v, w)
  • 4.6 m above seabed
  • 32 Hz
Velocity (Doppler profiler) Contact Jim Thomson for access to data Acoustic Doppler Current Profiler (ADCP) measurements of three dimensional velocity throughout the water column
  • 600 kHz RDI Workhorse
  • Velocity (u, v, w)
  • 2 Hz
Pressure, Salinity and Temperature Contact Jim Thomson for access to data Times series of temperature, salinity, and pressure


Site Modeling

After learning about and analyzing significant flow features through idealized modeling of a headland and a double-silled channel for tidal turbine siting, research has moved forward into simulation and analysis of a realistic model of Admiralty Inlet. This model is run using ROMS and is nested in a large, regional model of the Salish Sea operated out of the UW School of Oceanography. Using the output from this model, researchers are investigating what areas of the Inlet are best suited for tidal turbine placement and why.

Thyng, K. (2012) Numerical Simulation of Admiralty Inlet, WA, with Tidal Hydrokinetic Turbine Siting Application, PhD Dissertation, University of Washington, Seattle, WA.

Figure - Eddies during ebb

Figure - Eddies during flood



Simulation Videos