ERDC/CHL CHETN-I-70
May 2005
BOUSS-2D Wave Model in SMS:
2. Tutorial with Examples
by Zeki Demirbilek, Alan Zundel, and Okey Nwogu
demonstrate the use of BOUSS-2D in three example applications. The BOUSS-2D is a Boussinesq
wave model that is now part of the U.S. Army Corps of Engineers (USACE) Surface-Water
Modeling System (SMS). Demirbilek et al. (2004) gives a detailed description of the SMS interface
of BOUSS-2D. This second technical note in BOUSS-2D series is a step-by-step tutorial that shows
the usage of the model through illustrative examples. The next CHETN in the series will describe the
time-series and frequency-domain analysis utilities and techniques developed for post-processing
BOUSS-2D model results. Details of the BOUSS-2D model theory, numerical implementation, and
example applications are presented in a technical report (Nwogu and Demirbilek 2001).
BACKGROUND: As a phase-resolving nonlinear wave model, BOUSS-2D can be used in the
modeling of various wave phenomena including shoaling, refraction, diffraction, full/partial
reflection and transmission, bottom friction, nonlinear wave-wave interactions, wave breaking and
dissipation, wave runup and overtopping of structures, wave-current interaction, and wave-induced
currents. A comprehensive understanding of the BOUSS-2D interface in SMS is necessary for
maximizing the benefits of this tutorial. This CHETN will also prepare users for the third follow-up
note in this series about analysis utilities developed for BOUSS-2D model.
Wave estimates in navigation design, maintenance and operation studies, channel sedimentation,
inlets, and harbors are affected by the seabed topography, tidal currents and coastal structures
present in the areas of interest. These features cause temporal and spatial changes in the wave field
that can be estimated using an advanced nearshore wave propagation model such as the BOUSS-2D.
The model employs a time-domain solution of fully nonlinear Boussinesq-type equations, valid from
deep to shallow water, representing the depth-integrated equations of conservation of mass and
momentum for waves propagating in water of variable depth. Input waves to BOUSS-2D may be
periodic (regular) or nonperiodic (irregular), and both unidirectional or multidirectional sea states
may be simulated.
The governing equations in BOUSS-2D are solved in the time domain with a finite-difference
method, from which water-surface elevation and horizontal velocities are calculated at the grid nodes
in a staggered manner. Waves propagating out of the computational domain are absorbed in damping
layers placed around the perimeter of the domain. Damping and porosity layers can also be used to
simulate the reflection and transmission characteristics of jetties, breakwaters, and other structures
existing in the modeling domain. These and other details about BOUSS-2D model are provided in
the model report, containing six examples that illustrate model's versatility and features (Nwogu and
Demirbilek 2001).
Previous Page
