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COASTAL DATA INFORMATION PROGRAM 1975 - present Quality Assurance of Real-Time Data February 2004 Real-Time Web Products Southern California Summary Map Nowcast Model Products 1995: Wave Data Standards Analysis – US Army Corps of Engineers “… provide specifications on the analysis techniques that must be applied to wave data ….to ensure quality and uniformity of the final product. … The standard has evolved through a consensual approach involving the principal organizations which are responsible for the vast majority of wave measurements for this country. “ 2003: Handbook of Automated Data Quality Control Checks and Procedure of the National Data Buoy Center QUALITY ASSURANCE Pressure Sensor Calibration COLD BOX •Constant Temperature •Standard Paros •Battery of statistical test of dynamic pressure responses over several weeks to establish noise floor. DEEP TANK Soak complete package (sensors & cable) – Establish noise floor Generated from Aceh, Indonesia earthquake on Dec 26, 2005 @ 00:59UTC. Quality Control Specifications Pressure Sensors: Time Domain • • • • • • • • • • Max Wave Height Test Flat episodes Test Spike Test Max value Test: successive trough to crest Min Value Test: successive trough to crest Mean Shift Test Equal Peaks Test Acceleration Test Mean crossing Test Period Distribution Test Quality Control Specifications Wave Buoys: Frequency Domain • Check Factors Test – ratio of vertical to horizontal displacement • Inclination Test • Period exceedence Test Quality of Telemetery: • Discontinuities in transmission • Data Corruption Central Computer Automated Real-Time Processing Time Domain Time Series Quality Control Frequency Domain PRODUCTS STORAGE raw spectral parameters WEB UPDATE Real-Time/Historical NWS/NDBC Transmission Pub/Non-Public Station Specific Requests Error/Diagnostic Statistics Post Processing Inter-comparison of last 24 hours Waimea Buoy, HA – Frequency Domain QC 106: First indicated bad by TP errors > 30s -106 01 07/11/2003 20:19:30 hrs UTC code=551: (bdd_editor.f) Tp out of bounds: Flagged as NON-PUB 7/11/03 33.33 BAD – Energy in Low Frequency for all records Scripps Canyon NorthWest Buoy Frequency Domain QC Check factor values 114 01 08/16/2003 00:39:30 hrs UTC code=500: (bdd_editor.f) Abnormally high check factors (relationship between vertical and horizontal cross-spectra) Calibration Test – Bad displacement Direction & Period erratic. Retrieved buoy and performed calibration tests. Wave Data Torrey Pines Inner – 20m deep Torrey Pines Outer – 549m deep Buoys approximately 6 miles apart Dana Point Buoy, CA First indicated bad by inclination errors (> 5°) • 096 01 09/13/2003 18:59:30 hrs UTC code=702: (buoy_stats.f) Inclination off, arch: 58.52 file: 52.73 GOOD DISPLACEMENT PLOT BAD – Exagerrated Horizontal Amplitude Modeling Waves Across the Basin Headland shadowing Refractive effects Directional wave buoy to initiate model Island shadowing Diffraction effects Amplification over shoals Pacific Gas & Electric Company Diablo Canyon Nuclear Power Plant 2004 CDIP In-House Diagnostics • Paged: – off site (GPS & ARGOS) – data is > 1 hr old, – computer system is down, – computer partitions are > 90% full. • Programmers emailed : – Offsite – Data > 1 hr old, power outages, data transfer failedSystem messages CDIP Diagnostics 2004- Data Collection Coverage Percentages --------------------------------La Jolla – 99.89% Torrey Pines O – 95.29% San Pedro – 95.24 Santa Monica – 99.64% Pt Dume – 95.88% Goleta – 97.06% Harvest – 94.70% Pt. Reyes – 91.88% Grays Harbor – 99.31% Guam – 99.72% http://cdip.ucsd.edu