Teresa Garner Larry Atkinson. Introduction to HFRADAR Sites & Data Circulation in the Bay Tidal Sub-tidal Quality Control Efforts Instrument Comparisons.

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Presentation transcript:

Teresa Garner Larry Atkinson

Introduction to HFRADAR Sites & Data Circulation in the Bay Tidal Sub-tidal Quality Control Efforts Instrument Comparisons Pattern Measurements New Test Site in Bay New Visualization Software

RADAR Site Locations

Summer 90% Coverage shown in green. Winter RADAR Sites Missing times in blue. Gaps > 1 week Chesapeake Bay Data Coverage

Sunset Beach Test Site Provided by NOAA

Tides

2 hours: hours: hours: 67 5 hours: 38 6 hours: 11 Current Reversals Apr – Aug

Mean Sub-tidal Surface Circulation

Comparisons with NOAA PORTS Doppler Current Profilers CPHN York Spit (YS)Cape Henry (CH)Thimble Shoals (TS) RADARADCPRADARADCPRADARADCP

ADCP Along-Channel Comparisons RADAR cm/s ADCP cm/s RADAR cm/s ADCP cm/s Cape Henry StationThimble Shoals Station Cape HenryThimble Shoals R2R RADAR - CODAR Standard Deviation Aug :00 – Sep :00 UTC

What difference does it make? Antenna Pattern Smoothing CBBT July 2010VIEW May 2007 Loop1 red Loop2 blue Smoothing 0, 5 & 10 degrees

R1 Only: 96 count (red) R2 Only: 66 count (blue) Velocity Differences (R1-R2) for All Shared Radials: 783 count R1 slower (pink/red) R2 slower (cyan/blue) Darker shades > 30 cm/s Average Speed Difference = 10.3 cm/s Direction Changes (Subset of Shared Radials: 82 count) Average Speed Difference = 38.2 cm/s Bearing vs Speed Differences for All Shared Radials Speed Differences (cm/s) R1 = /Users/garner/RADAR_GUIS/RadialEdits/CBBT/Radials From July2010 APM52deg smooth5/RDLm CBBT ruv (879 count) R2 = /Users/garner/RADAR_GUIS/RadialEdits/CBBT/Radials From July2010 APM52deg smooth0/RDLm CBBT ruv (849 count) Bearing (deg CCWE) CBBT

R1 Only: 18 count (red) R2 Only: 31 count (blue) Velocity Differences (R1-R2) for All Shared Radials: 368 count R1 slower (pink/red) R2 slower (cyan/blue) Darker shades > 30 cm/s Average Speed Difference = 3.4 cm/s Direction Changes (Subset of Shared Radials: 15 count) Average Speed Difference = 8.0 cm/s Bearing vs Speed Differences for All Shared Radials Speed Differences (cm/s) R1 = /Users/garner/RADAR_GUIS/RadialEdits/VIEW/VIEW smooth00/RDLm VIEW ruv (386 count) R2 = /Users/garner/RADAR_GUIS/RadialEdits/VIEW/VIEW smooth05/RDLm VIEW ruv (399 count) Bearing (deg CCWE) VIEW

Antenna Patterns at CBBT

Matlab GUI Scripts for QA/QC Works with HFRADAR community toolbox HFR Progs Display radial and/or total maps (can overlay plots) Compute totals for a list of specifically chosen radials (LSQ method) Edit a radial map by clicking on vectors to remove Run a custom script that will edit radial files Plot only the radials that contributed to a specific total vector Compare two radial maps

Viewer

Radial Map Editor

Compute Totals (LSQ)

HFRADAR surface current data in the lower Chesapeake Bay (April 2007-present) are available through ODU and the data may be transferred in a variety of formats (i.e. text, MAT files, NetCDF). Teresa Garner Data Access Old Dominion University

CIT, MACOORA, NOAA CODAR support HFRADAR operators Acknowledgements

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

Baseline Comparisons

Mean Sub-tidal Surface Circulation