Surface Current Mapping with High Frequency RADAR.

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Presentation transcript:

Surface Current Mapping with High Frequency RADAR

Applications Search and rescue Navigation Pollution Tracking (Oil spills, red tides, …) Recreational boating Fishing Assimilation into numerical circulation models to improve nowcast/forecast capabilities

Study Area & Antenna Sites Source: U.S. Geological Survey ( Source:

Chesapeake Bay Bridge Tunnel (CBBT) Ocean View Community Beach (VIEW) AT OUR FIELD SITES 25.4 MHz CODAR Standard Range Antennas with co-located Tx/Rx MiniMac Field Computers Cell phone/Cable modem connections

Operating Costs Equipment (antenna, computer, electronics enclosure, software) roughly 150K / site Power / network connections / access to the site –CBBT $220/ month –VIEW $100/ month Technician Additional costs: Pattern measurements

Data Products Updated Hourly Sub-tidal Flow Trajectories ( Time Series Hourly Velocity

Shipping Channels

HF RADAR National Network UCSD, Scripps Institute

½ λ f = 25MHz λ=12m Water speed is determined using the frequency shift, f s, in the return signal. f obs =25 + f s f=25 Ocean waves with strongest return signal Antenna

Radial Current Velocities… are combined on a grid Mapping requires at least two antennas! A single antenna measures only one component of the water velocity, the speed of the water moving directly towards or away from it. Radial vectors are output in range bins of 1.5 km and directional bins of 5 degrees. The grid is designed by the operator.

Grid for Total Current Vectors 2 km Grid courtesy of CORDC National Network Preserves orthogonality Red points fail stability angle requirements Baseline

Gridpoint 2.5 km Radial Current Velocities Total Current Velocities Around each grid point… Combine Radial Vectors (Least Squares Average) + Grid

Data Quality Calibration and Radial Coverage

Antenna PatternsRadial Coverage CBBT VIEW

Challenges At a 360° site, antenna pattern measurement is essential Antenna isolation Summertime heat Interference (Natural & Man-made)

Baseline (consistency) Tide Moored ADCP Towed ADCP Data Validation by Comparison Photo Source: NOAA OSTEP report

Baseline Comparisons Ideal antenna patternsMeasured antenna patterns

Tidal Analysis

Moored ADCP Comparison (CH) (TS) (YS) SiteMeanS.Dev Cape Henry Thimble Shoals York Spit Red line = CODAR Blue line = NOAA ADCP Black = |NOAA-CODAR| Difference Statistics

Bistatic system: enhance coverage by using precise timing so that Rx can receive sea scatter from another transmitter (e.g. on a buoy) RiverSonde Ship detection Shallow water waves CODAR Current Research & Development Source: CODAR Research & Development poster

Our Future Plans Incorporate data into GIS; map with other regional spatial data Continue to work with trajectories/ plume tracking Model comparisons Outreach (VA Aquarium, education) Web page & product development –Shipping channels –Ocean View beaches ChesROMS model output AVHRR SST Daily Composite, September 24, 2007 from NOAA Coastwatch

Acknowledgements Larry Atkinson and Jose Blanco CIT, MACOORA, NOAA CODAR support Advice and assistance from numerous other HF RADAR operators