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Acoustic-Microwave Water Level Sensor Comparisons in an Estuarine Environment

Acoustic-Microwave Water Level Sensor Comparisons in an Estuarine Environment. John D. Boon John M. Brubaker Virginia Institute of Marine Science College of William and Mary Gloucester Point, VA 23062. OCEANS’08 MTS/IEEE MEETING, QUEBEC, CANADA. Acoustic Sensor Aquatrak 3000 Series

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Acoustic-Microwave Water Level Sensor Comparisons in an Estuarine Environment

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  1. Acoustic-Microwave Water Level Sensor Comparisons in an Estuarine Environment John D. Boon John M. Brubaker Virginia Institute of Marine Science College of William and Mary Gloucester Point, VA 23062 OCEANS’08 MTS/IEEE MEETING, QUEBEC, CANADA

  2. Acoustic Sensor Aquatrak 3000 Series Primary Sensor NOAA/NOS National Water Level Observation Network (NWLON)

  3. Selected Microwave Sensors 2 signal types: pulse and frequency modulated continuous wave Design Analysis Ohmart/Vega Sutron Miros Heitsenrether et al., OCEANS’08 MTS/IEEE QUEBEC

  4. Test Setup Heitsenrether et al., OCEANS’08 MTS/IEEE QUEBEC

  5. Microwave Sensor Design Analysis Associates (DAA) Model H-3611 Virginia Institute of Marine Science (www.vims.edu/tidewatch)

  6. Acoustic Microwave

  7. STORM TIDE EMERGENCYMANAGEMENT (STEM) (www.vims.edu/tidewatch) Storm Surge Tidal Water Levels Subtidal Water Levels 6-minute data in near real-time

  8. STORM TIDE EMERGENCYMANAGEMENT (STEM) (www.vims.edu/tidewatch) Storm Surge Tidal Water Levels Subtidal Water Levels 6-minute data in near real-time Tsunami Warning Systems 1-minute data in near-real time

  9. JAMESTOWN FERRY PIER, VA HANNA

  10. Hurricane IKE

  11. Water Level Measurements Fixed Sampling Interval Noise (Gaussian) + Signal (periodic)

  12. Water Level Measurements Fixed Sampling Interval Noise (Gaussian) + Signal (periodic) • Standard error = σ/√n (moving average)

  13. Water Level Measurements Fixed Sampling Interval Noise (Gaussian) + Signal (periodic) • Standard error = σ/√n (moving average) • More is better • Interval doesn’t matter

  14. Water Level Measurements Fixed Sampling Interval Noise (Gaussian) + Signal (periodic) • Standard error = σ/√n (moving average) • More is better • Interval doesn’t matter • Energy-Frequency distribution (numerical filter)

  15. Water Level Measurements Fixed Sampling Interval Noise (Gaussian) + Signal (periodic) • Standard error = σ/√n (moving average) • More is better • Interval doesn’t matter • Energy-Frequency distribution (numerical filter) • Longer is better • Interval matters

  16. Acoustic Water Level (AWL)Aquatrak 3000 NOAA/NOS • Data Collection Rate: 1 sample/sec (1Hz)

  17. Acoustic Water Level (AWL)Aquatrak 3000 NOAA/NOS • Data Collection Rate: 1 sample/sec (1Hz) • Filtering: 181-second Moving Average

  18. Acoustic Water Level (AWL)Aquatrak 3000 NOAA/NOS • Data Collection Rate: 1 sample/sec (1Hz) • Filtering: 181-second Moving Average • Outliers: Values>3σ eliminated

  19. Acoustic Water Level (AWL)Aquatrak 3000 NOAA/NOS • Data Collection Rate: 1 sample/sec (1Hz) • Filtering: 181-second Moving Average • Outliers: Values>3σ eliminated • Reporting Interval: 6 minutes

  20. Microwave Water Level (mwwl)Design Analysis Associates H-3611 • Data Collection Rate: 1 sample/minute

  21. Microwave Water Level (mwwl)Design Analysis Associates H-3611 • Data Collection Rate: 1 sample/minute • Filtering: Finite Impulse Response (FIR)

  22. Microwave Water Level (mwwl)Design Analysis Associates H-3611 • Data Collection Rate: 1 sample/minute • Filtering: Finite Impulse Response (FIR) • Outliers: None removed

  23. Microwave Water Level (mwwl)Design Analysis Associates H-3611 • Data Collection Rate: 1 sample/minute • Filtering: Finite Impulse Response (FIR) • Outliers: None removed • Reporting Interval: 6 minutes

  24. VIMS DATA BLOCK: 12 one-minute water levels

  25. VIMS DATA BLOCK: 12 one-minute water levels

  26. VIMS DATA BLOCK: 12 one-minute water levels

  27. VIMS DATA BLOCK: 12 one-minute water levels 11 minute series

  28. VIMS DATA BLOCK: 12 one-minute water levels 11-point Moving Average ?

  29. VIMS DATA BLOCK: 12 one-minute water levels 11-point Moving Average ? Finite Impulse Response (FIR) Filter with weights

  30. VIMS DATA BLOCK: 12 one-minute water levels 11-point Moving Average Finite Impulse Response (FIR) Filter with weights Symmetric filter

  31. VIMS DATA BLOCK: 12 one-minute water levels FIR Frequency Response Function* *Fitted using Bloomfield’s least squares approximation

  32. 27 minute pass 6 minute stop

  33. 88 minute pass 21 minute stop

  34. RMSD = ± 6.7 mm

  35. Findings • Microwave, acoustic sensors in agreement

  36. Findings • Microwave, acoustic sensors in agreement • No indication of wave-induced “offset”

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