3.17.72d_bc Layers
Boundary conditions and links to 1D domains for 2D domains are defined using one or more 2d_bc GIS layers. Fixed field text inputs are also supported for backward compatibility. The different types of boundaries and links are described in Table 4 .24.
The GIS layers may contain points, lines, polylines and regions, noting that for regions only the centroid is used. Each object has several attributes as described in Table 4 .25.
Table 4.24 2D Boundary Condition Types and Links to 1D Nodes
Type
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Description
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Comments
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Water Level Boundaries
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HS
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Sinusoidal (Tidal) Water Level (m)
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A sinusoidal wave based on any number of constituents. Four columns of data are required in the source file if using .csv files. The four columns in order are the mean water level (m), amplitude (m), phase difference (°) and period (h). Each row of data represents the harmonics of one wave. Any number of harmonics can be specified within the one HS boundary.
Prior to Build 2003-05-AC, HS boundaries had to be entered using the fixed field approach (see Section E.3).
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