ON THE ACCURACY OF PARABOLIC WAVE MODELS

Hakeem K. Johnson, Sanne Poulin

Abstract


Errors in parabolic equation models (PEM) for wave refraction and diffraction are investigated by examining the case of waves propagating over a planar bathymetry for which the analytical solution is well known. The models investigated are: i) lowest order parabolic approximation (Simple method), ii) Fade approximation and Hi) Minimax approximation models. Errors in wave heights, wave directions, radiation stresses and resulting longshore currents are investigated analytically and by numerical tests using the parabolic equation model MIKE 21 PMS. The results indicate that, while the predicted wave directions are generally accurate, the wave heights, radiation stresses and longshore currents can contain significant errors depending on the parabolic approximation used.

Keywords


wave model; parabolic wave model; model accuracy

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