Non-hydrostatic modelling of infragravity waves using SWASH

Conference paper (2012)

Authors

D.P. Rijnsdorp

P.B. Smit

M. Zijlema

Department

Hydraulic Engineering () (TU Delft)

SWASH Infragravity waves Non-hydrostatic modelling Nearshore wave transformation

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Published Date

01-07-2012

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Source:

ICCE 2012: Proceedings of the 33rd International Conference on Coastal Engineering, Santander, Spain, 1-6 July 2012

Faculty

Civil Engineering and Geosciences

Department

Hydraulic Engineering

Abstract

This paper presents numerical modelling of the nearshore transformation of infragravity waves induced by bichromatic wave groups over a horizontal and a sloping bottom. The non-hydrostatic model SWASH is assessed by comparing model predictions with analytical solutions over a horizontal bottom and with detailed laboratory observations for a sloping bottom. Good agreement between model predictions and data is found throughout the domain for bound infragravity waves. Furthermore the model predicts greater outgoing free infragravity wave-heights for steeper slope regimes which is consistent with the measurements. The model however tends to overestimate the magnitude of the outgoing infragravity waves.

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