SMS:CGWAVE Boundary Conditions Dialog

File:CGWAVE BC.jpg

CGWAVE Boundary Condition dialog

In the CGWAVE model, a wave direction, amplitude and frequency must be specified at open boundaries and reflection coefficients are defined for all closed boundaries. In addition to these exterior boundaries, the model also includes the capability to simulate interior islands, and floating barriers.

Assign Boundary Condition

The CGWAVE Boundary Conditions dialog is used to assign boundary conditions to individual nodestrings. This dialog is invoked with the Assign BC command in the CGWAVE menu. Before assigning boundary conditions to nodestrings, at least one nodestring must be selected using the File:SelectMeshNodestring.JPG Select Nodestring tool. To assign boundary conditions to the selected nodestring(s), select one of the boundary condition options.

Boundary Types

• Open Ocean – Delineate the region where waves will enter the domain. The attributes of the waves that enter the domain are defined as incident wave characteristics in the CGWAVE Model Control dialog. These values are propagated from an offshore location to the open ocean boundaries.
• Coastline – Represent a region where the wave is obstructed. At these locations, the Reflection coefficient should be set. The coastline reflection term defines to what degree a section of coastline reflects incoming waves. Legal values vary from 0.0 for a gradual sandy incline to 1.0 for solid vertical rock wall. This boundary condition may be assigned to either exterior regions of the domain, or interior holes which represent islands.

The CGWAVE Boundary Conditions dialog is used to set the attributes for feature nodestrings. Attributes that can be specified for each nodestring include:

• Boundary Type
  • None
  • Open ocean
  • Coastline
    • Reflection coefficient
  • Floating Barrier

Related Topics

• CGWAVE
• CGWAVE Graphical Interface
• CGWAVE Boundary Conditions
• Feature Objects Menu