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GGE 5013 Lab II – Tidal Analysis November 15 th , 2006 ian.church@unb

GGE 5013 Lab II – Tidal Analysis November 15 th , 2006 ian.church@unb.ca. Tidal Analysis Lab. Perform Analysis on 7 Tide Stations Extract the Harmonic Constituents (T_Tide) Compare Predicted Tides to the Original Tide Extract the Tidal Residuals

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GGE 5013 Lab II – Tidal Analysis November 15 th , 2006 ian.church@unb

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  1. GGE 5013Lab II – Tidal AnalysisNovember 15th, 2006ian.church@unb.ca

  2. Tidal Analysis Lab • Perform Analysis on 7 Tide Stations • Extract the Harmonic Constituents (T_Tide) • Compare Predicted Tides to the Original Tide • Extract the Tidal Residuals • Explain the Residuals using Meteorological Data • Compare the Residuals at each Station GGE5013 Lab2

  3. GGE5013 Lab2

  4. T_Tide • T_Tide Harmonic Analysis Toolbox for Matlab • Developed by Rich Pawlowicz at UBC from IOS Tidal Package by Mike Foreman Fortran  Matlab GGE5013 Lab2

  5. Literature • T_Tide Harmonic Analysis Toolbox for Matlab: • R. Pawlowicz, B. Beardsley, and S. Lentz, "Classical tidal harmonic analysis including error estimates in MATLAB using T_TIDE", Computers and Geosciences 28 (2002), 929-937. • IOS Tidal Package Manual: • Foreman, M.G.G., 1977. Manual for Tidal Heights Analysis and Prediction. Pacific Marine Science Report 77-10, Institute of Ocean Sciences, Patricia Bay, Sidney, B.C., 58 pp. (2004 revision). GGE5013 Lab2

  6. T_Tide Programs • t_tide.m • t_predic.m* • t_demo.m • t_readme.m Programs of Interest GGE5013 Lab2

  7. Optional: 'interval' 'start time' 'latitude' 'inference‘ ‘shallow’ ‘…’ Descriptions can be found in t_tide.m file help t_tide T_Tide Inputs • Required: • Array of Water Level Elevations [:,1] GGE5013 Lab2

  8. T_Tide Outputs • Structure: • Constituent Names • Frequency • Amplitude, Amp Error, Phase, Phase Error • New Predicted Time Series GGE5013 Lab2

  9. Example – Hydrocamp 2006 • St. Andrews, NB GGE5013 Lab2

  10. Matlab Example • Load Data into Matlab • Run t_tide • [Tide_Struct, Pred_Out] = t_tide(TideData,'interval',1/6, 'start time', StartTime,'latitude',44+38/60); • Above example for an array of 10 minute tide data • StartTime is the beginning time of the tidal time series in Matlab serial date format created using “datenum” in Matlab (type “help datenum” in Matlab for usage) • Latitude is the station latitude • Save Predicted Tide & Examine Residuals GGE5013 Lab2

  11. Questions? GGE5013 Lab2

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