GGE 5013 Lab II – Tidal Analysis November 15th, 2006

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Presentation transcript:

GGE 5013 Lab II – Tidal Analysis November 15th, 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 Explain the Residuals using Meteorological Data Compare the Residuals at each Station 4/12/2019 GGE5013 Lab2

4/12/2019 GGE5013 Lab2

T_Tide T_Tide Harmonic Analysis Toolbox for Matlab Developed by Rich Pawlowicz at UBC from IOS Tidal Package by Mike Foreman Fortran  Matlab 4/12/2019 GGE5013 Lab2

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). 4/12/2019 GGE5013 Lab2

T_Tide Programs t_tide.m t_predic.m* t_demo.m t_readme.m Programs of Interest 4/12/2019 GGE5013 Lab2

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 4/12/2019 GGE5013 Lab2

T_Tide Outputs Structure: New Predicted Time Series Constituent Names Frequency Amplitude, Amp Error, Phase, Phase Error New Predicted Time Series 4/12/2019 GGE5013 Lab2

Example – Hydrocamp 2006 St. Andrews, NB 4/12/2019 GGE5013 Lab2

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 4/12/2019 GGE5013 Lab2

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 4/12/2019 GGE5013 Lab2