A PARABOLIC REFRACTION-DIFFRACTION EQUATION IN THE RAT-FRONT COORDINATE SYSTEM

Masahiko Isobe

doi:10.9753/icce.v20.24

No. 20 (1986), Conference Proceedings

No. 20 (1986)

A PARABOLIC REFRACTION-DIFFRACTION EQUATION IN THE RAT-FRONT COORDINATE SYSTEM

Conference Proceedings

https://doi.org/10.9753/icce.v20.24

Published 1986-01-29

Masahiko Isobe⁺⁻

Masahiko Isobe

Department of Civil Engineering, Yokohama National University

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Keywords

refraction
diffraction
parabolic refraction-diffraction equation
ray-front coordinates

How to Cite

Isobe, M. (1986). A PARABOLIC REFRACTION-DIFFRACTION EQUATION IN THE RAT-FRONT COORDINATE SYSTEM. Coastal Engineering Proceedings, 1(20), 24. https://doi.org/10.9753/icce.v20.24

Abstract

The parabolic equation method has been extensively used for combined refraction and diffraction problems of water waves. However, a parabolic equation is valid only when the direction of wave propagation nearly coincides with that of a coordinate; therefore, the validity ranges of the parabolic equations developed so far are restricted. In order to achieve a wide range of validity, a parabolic equation is derived in this paper by employing a curvilinear coordinate system which has a pattern similar to that of wave rays and fronts. A computer program which is applicable to an arbitrary arrangement of coastal structures is then developed. Results of numerical calculations are compared with available analytical solutions and laboratory data. It is proved that the present parabolic equation has a high accuracy for a wide range of incident wave direction and structure arrangement.

https://doi.org/10.9753/icce.v20.24

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A PARABOLIC REFRACTION-DIFFRACTION EQUATION IN THE RAT-FRONT COORDINATE SYSTEM

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