TUFLOW 2D2D BC Advice: Difference between revisions
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'''<u>2D BC Line Orientation'''</u>'''<br>
* The 2d_bc “2D” link line should be orientated perpendicular to the flow direction in areas of moderate to high velocity (>1m/s), such as across a river or creek.<br>
[[File: 2D2D_Guidance_004.JPG |400px]]<br>
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[[File: 2D2D_Guidance_005.JPG |400px]]<br>
* The 2d_bc “2D” link line can be orientated in any direction within floodplain areas with low velocity (<1m/s). The 2d_bc “2D” link line “d” attribute should be used in this situation. This is discussed in the following section. <br>
'''<u>Line Vertex Location'''</u>'''<br>
2d_bc “2D” link line vertices are best located on ridges or embankments, particularly if the features become inundated and drowned out during a simulation. 2d_bc “2D” link line “d” attribute can be used to insert additional “hidden” vertices (storage nodes) between the manually specified vertices location.<br>
* In regions of low velocity (<1m/s), the “d” value should be no less than three times the distance of the larger cell resolution associated with the 2D/2D boundary. For example, if the model adopts a 2.5m and 5m resolution, the “d” attribute should be set no smaller than 15m.<br>
* In regions of high velocity (>1m/s), greater or no “d” value is common. Not specifying a “d” value will create a hidden 1D node at each vertex along the 2d_bc “2D” link line.<br>
'''<u>Storage Multiplier'''</u>'''<br>
2d_bc “2D” link line “a” attribute defines the storage allocation to each of the hidden 1D nodes. The default value is 2. Increasing the value may improve stability, though but may unacceptably attenuate results. Sensitivity testing has identified the following recommended maximum values:<br>
* Low velocity area (<1m/s): “a” <=3<br>
*
'''<u>Separate “2D” Link Lines'''</u>'''<br>
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