ERDC/CHL CHETN-I-70
May 2005
The SI engineering units are used in BOUSS-2D calculations. Data in English units can be imported
into the SMS interface and converted to metric. For example, bathymetric data in latitude/longitude
can be converted in the model interface to UTM or State Plane coordinates. Likewise, model results
can be presented in English units using conversion tools and data calculator features available in
SMS. The interface of BOUSS-2D in SMS (Zundel et al. 1998; and Zundel 2005) facilitates grid
generation and specification of model parameters. Model input and output may be pre- and post-
processed in different formats, using two- and three-dimensional (2- and 3-D) display and
visualization options and a variety of animation types (see Demirbilek et al. 2004). The bathymetry,
wave data, and model parameters used in BOUSS-2D simulations are formatted into specific file
formats in the SMS interface. The users must assemble input bathymetry and wave data for a
BOUSS-2D simulation from appropriate data sources. Data sources are accessible from within SMS
for bathymetry and coastlines, and other commercial databases that may also be used to assemble the
requisite input for BOUSS-2D model
The emphasis of this CHETN is to provide description of a few typical examples for BOUSS-2D
simulations. The examples should be helpful to users in practical applications. In the first example,
step-by-step instructions are described in a complete BOUSS-2D simulation for prediction of the
wave climate in Barbers Point Harbor, HI. In this case, details of each step are presented for the
understanding of the modeling process used in BOUSS-2D. In the last two examples, the model's
features and capabilities for wave-structure interaction problems are demonstrated. The second
example shows application of the model to a jettied inlet, illustrating the use of porosity layers
around jetties or breakwaters. The third example demonstrates the use of a simplified 1-D version of
the Boussinesq model to estimate wave runup and overtopping of idealized sloping structures.
EXAMPLE 1 BARBERS POINT HARBOR, HI:
Images: It is often useful to have background images to help orient numerical grids in a simu-
lation, and to place coastlines and structures with precision that exist in the modeling region. These
images may be digital bathymetry charts or aerial photographs. In this example, two images were
downloaded from the TerraServer site http://terraserver.homeadvisor.msn.com. These digital
bathymetric charts cover a small portion of coast on southwest corner of the island of Oahu, HI. Use
File|Open and select the file topo1.jpg to read in the first image. The Internet-based resource also
provides a world file to geo-reference this image. Should SMS ask if image pyramids are desired,
select the toggle to not ask this question again and click Yes. Repeat the file opening procedure for
file topo2.jpg. SMS will piece together these two images (Figure 1).
After reading these images into SMS, tell it what coordinate system the data are referenced to. The
coordinate system is dependent on the data source. For the TerraServer site, all world files register
the images to UTM coordinates in NAD83. To pass this information to SMS, select Edit|Current
Coordinates, and specify UTM NAD 83 (US), select the horizontal and vertical units as "meters"
and the UTM Zone as Zone 4. Images may be used to define land boundaries of modeling domain
and structures.
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