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In the Harmonic Coefficient Forcing Type frame the user has three options; constant, linear variation and quadratic variation. It is generally recommended to use a constant forcing. With the other two options the user must specify additional one or two amplitude and phase for each tidal constituent, respectively. EFDC will then vary the final (i.e. applied) phase and amplitude for each tidal constituent using the specified method and values.

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EFDC_Explorer provides a Tide Generator Tool for generating a pressure time series computed as astronomical tidal forcing.
The basic formula for the oscillation of water level due to astronomical tides is based on the combination of the tidal constituents as follows:

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In which

η = tide level (m)

z₀ = mean sea level above the datum (m)

f_i = nodal coefficient to adjust amplitude for the i^th component

H_i = amplitude of the i^th component (m)

ω_i = speed or angular velocity of the  i^th component (radians per second)

t = time (s)

(V₀ + u)_i = astronomical arguments of the i^th component

g_i = phase lag of the i^th component from Greenwich longitude

It should be noted that the units used in EE can be changed so that they are convenient for the users.

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Each series can have its own name, and the user may apply a datum shift (z_o) in meters or time shift in hours to the series. A row may be deleted by selecting Shift and RMC. An example of the data structure is provided in Appendix B.  

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