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Open-File Report 20141159


Coastal Change Processes Project Data Report for Observations Near Fire Island, New York, January to April 2012


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Tidal Analysis

Amplitude and phase of principal tidal constituents were computed by using the tidal analysis program T_TIDE (Pawlowicz and others 2002). The principal constituents are K1, O1, M2, N2, and S2. This report includes the full output from T_TIDE for each data record. The duration of time series used to compute the harmonics is different for each instrument, depending on instrument deployment and recovery times (see Appendix - Instrument Log), and data availability.

Table headings for T_TIDE output:

  • tide: tidal constituent freq: frequency (cycles/hour)
  • major: major axis of tidal ellipse (for current observations) (centimeters per second [cm/s])
  • emaj: error estimate for major axis (cm/s)
  • minor: minor axis of tidal ellipse (cm/s)
  • emin: error estimate for minor axis (cm/s)
  • inc: inclination of major axis (counter clockwise from east) (degrees)
  • einc: error estimate for inclination (degrees)
  • phase: phase of major axis (degrees)
  • ephase: error estimate of phase (degrees)
  • snr: signal-to-noise ratio
Site Pressure
1 mab
Current velocity
Surface Bottom
1 Output Output Output
2 Output Output Output
3 Output Output Output
4 Output Output Output
5 Output none none
6 Output Output Output


Significant constituents (those with signal-to-noise ratio in the last column greater than 1) are indicated with an asterisk.

mab= meters above bottom

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