1. GGE 5013 Lab II – Tidal Analysis November 15th, 2006 ian.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
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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
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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),
IOS Tidal Package Manual:
Foreman, M.G.G., 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).
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6. T_Tide Programs t_tide.m t_predic.m* t_demo.m t_readme.m
Programs of Interest
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7. T_Tide Inputs Required: Array of Water Level Elevations [:,1]
Optional:
'interval'
'start time'
'latitude'
'inference‘
‘shallow’
‘…’
Descriptions can be found in t_tide.m file
help t_tide
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8. T_Tide Outputs Structure: New Predicted Time Series Constituent Names
Frequency
Amplitude, Amp Error, Phase, Phase Error
New Predicted Time Series
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9. Example – Hydrocamp 2006
St. Andrews, NB
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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
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11. Questions? Station Name St. John, NB Miguel Eastport, ME Andy
Cutler, ME
Blaine
Yarmouth, NS
Shawn
North Head, NB
Blair and Scott
Digby, NS
Aluizio
Brier Island, NS
Pim
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