Data I have : Significant wave height, Wave period, and beach face slope.
The deep water wave height Ho' can be computed by dividing the shallow water wave height by the shoaling coefficient and refraction coefficient. An approximation is to use linear wave theory to compute the shoaling coefficient (function of wave period and depth) and use snell's law to compute the refraction coefficient (need wave period, depth and wave approach angle (direction) at the shallow water location. These equations are available on line and in coastal engineering text books.
If your wave is in very shallow water (breaking) the linear shoaling coefficient calculation could be replaced with an empirical or non-linear equation - there are many to chose from - if not comfortable selecting the best method, use several and get a range of results.
The shallow water direction may not be known - typically refraction causes the wave approach angle become smaller with shallower depth. So again you could assume a range of wave approach angles.
I neglected diffraction - you can find diffraction diagrams in coastal engineering text books and manuals.
Many practitioners would prefer to apply a wave transformation model to compute the wave transformations; typically using a 2-dimensional depth averaged computer model. You might check if such a model has already been applied at your location and ask for the wave transformation coefficients and use them.
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