Tutorial Module13 Archive: Difference between revisions

==Introduction==

In this module a variable geometry layer will be setup. The layer used for this will be the 2D variable Z shape ('''2d_vzsh'''). These layers can be used to alter Zpts over the course of a simulation, to model, for example, breaching of embankments or even the filling of river due to a landslide. This layer is an advanced version of the 2D Z Shape ('''2d_zsh''') used in previous modules (3 and 5). The variable Z shape has all the functionality of the Z shape layer and topography modifiers can be a mix of polygons, lines and points.<br>

In this tutorial, the 2d_vzsh will be used to trigger a breach of the northern road embankment. The breach will be set to occur when the water level upstream of the just exceeds the road crest. Other options vzsh triggers can include a specific time or when the water level difference between two triggers exceeds a specified amount.<br>

The 2d_vzsh layer is used to define the final topographic shape at the end of the breach and/or fill period.

==Alternatives==

If you would like to trigger the breach on the water level in the 1D (as opposed to the 2D), in the 2d_vzsh layer the trigger point must be snapped to the 1D node or channel end. For the "Shape_Options" attribute the entry must be '''Trigger 1D''' (not just “Trigger”), so TUFLOW knows to search for a snapped 1D node. Use the 2d_ vzsh_zpt_check layer to cross-check that the 1D node trigger has been correctly selected.

 

==Conclusions==