Here you need to input the breaking wave height and wave angle to determine Q, the longshore sediment transport. To also determine G, the shoreline diffusivity, you need to input some geometry of the beach profile--the berm height and the depth of closure (the depth beyond which the profile does not change with time).

Assumed values: sand porosity = 0.3, specific gravity of sand= 2.65, breaking index = 0.78. To change the output values of Q and G for a different value of porosity (p), multiply the output values by (1-0.3)/(1-p). For a different specific gravity (s), multiply the output by (2.65 - 1)/(s-1).

Comments: Robert A. Dalrymple