Numerical modelling of hydrodynamics and sediment transport in the surf zone

A sensitivity study with different types of numerical models

Conference paper (2012)

Authors

Koen Trouw Fides Engineering

Nicolas Zimmermann IMDC

M. Mathys IMDC

Rosalia Delgado Flanders Hydraulics Research

D. Roelvink IHE Delft Institute for Water Education

Research Group

Coastal Engineering () (TU Delft)

Delft3D XBeach Beach dynamics Morphological modeling

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Published Date

2012

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Coastal Engineering

Abstract

A comparison between two very different numerical models is presented: Delft3D and XBeach. Delft3D (Deltares) calculates non-steady flow and transport phenomena that result from tidal and meteorological forcing. The wave propagation is calculated in the frequency domain. XBeach (Unesco-IHE, Delft University and Deltares) consists of formulations for short wave envelope propagation (time-dependent wave action balance), non-stationary shallow water equations, sediment transport and bed update. The model is able to resolve the time dependent long waves, which are important in the surf zone. A number of simplified cases are defined beforehand taking into account actual features and conditions existing in chosen problem areas. The examination of these simplified cases allows for the identification of driving processes and the assessment of the sensitivity to certain relevant parameters, with the advantage of working in scenarios of limited complexity and without excessive computational load.