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Rutgers ADCP Waves Array Data Review

Rutgers ADCP Waves Array Data Review. December 2005 Deployment. Overview. Deployment captures evolution of waves from a passing coastal storm. Redundant acoustic surface track derived spectra allow quality checking of directional array.

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Rutgers ADCP Waves Array Data Review

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  1. Rutgers ADCP Waves Array Data Review December 2005 Deployment

  2. Overview • Deployment captures evolution of waves from a passing coastal storm. • Redundant acoustic surface track derived spectra allow quality checking of directional array. • Deployment with “full profile” allowed flexibility to observe velocity oscillations from near surface to near bottom • 4-Beam “error velocity” quantifies error in the instantaneous near surface velocities. • Setup to optimize processing is detailed

  3. Waves Data QACheck List • Use WaveView to verify data quality ( *.wvs file) • Check for reasonable parameters in the time series (Hs, Tp, Dp) • Check error log • Check for agreement in 1-D spectra • Check for reasonable high frequency cutoff • Check for reasonable directional spectra

  4. Event Summary - 8192

  5. Early Storm Primary Energy = 9.1 sec. Secondary Energy = 5.5 sec.

  6. Early Storm • Vertical Velocity Time Series

  7. Early Storm • Direction Time Series

  8. Early Storm • Magnitude Time Series

  9. Early Storm • Error Time Series

  10. Early Storm – Time Series • Error Time Series • Speed • Direction • Vertical

  11. Peak of Storm Primary Energy = 10.7 sec. Secondary Energy = 3.0 sec.

  12. Peak of Storm • Vertical Velocity Time Series

  13. Peak of Storm • Direction Time Series

  14. Peak of Storm • Magnitude Time Series

  15. Peak of Storm • Error Time Series

  16. Peak of Storm Time Series • Error Time Series • Speed • Direction • Vertical

  17. Solution for Processing • Expert Options Required because of 75 cm “offset” in the pressure sensor. • Use Acoustic Surface Tracking for water level + primary non-directional estimate • Manually set bins for directional waves processing (#9-14) • Manually set High Frequency cutoff for velocity directional spectra to 0.36 hz • Set Processing FFT Length to 8192 points, post process to generate “hourly” average

  18. WavesMon Processing #1

  19. WavesMon Processing #2

  20. Comparing Spectra • Why issue with velocity spectra when using pressure sensor to define tide? • Pressure For Water Level • Surface Tracking for Water Level

  21. Why Error In Spectra? • Issue with Pressure Sensor, error of ~751 mm. • Range of Error 1209 to 584 mm

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