Generate coastline

[ole]

If ANUGA could output its coastline (0 < stage <= epsilon) as a polyline, it could be used to define buffered polygons for use with mesh refinement.

This was requested by Rudy van Drie and Petar Milevski 16 June 2008 and would make for a very useful feature.

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By the way... both Petar & I are convinced that when it comes to flood modelling ANUGA could be incredibly productive if we can some how get the extent of flow depth plotted and use that to initiate a refined mesh..

So the concept is ( I have spoken to you before about this...) 1. Just run rainfall over a catchment with any arbitrary mesh size. 2. ANUGA will provide a very rough extent of flooding 3. Create a function that will plot the extent of inundation to a defined depth say 300mm for now and create a polygon 4. This polygon is then used to refine the mesh, 5. Rerun ANUGA 6. Iterate Steps 2 - 5 to continue to refine the mesh !!!

This will eliminate a very tedious and time consuming procedure every has to use to refine the model around a watercourse !!!

This will really provide a big push in terms of productivity and accuracy !!!

It is also apparently very do-able...

The alpha-shape function could be manipulated to wrap a polygon around where depth exceeds 0.3m for instance....

Note this will reduce the need to have a terrain tool to identify the watercourse....

NOTE: would still be very useful to have terrain tools that can identify both RIDGE LINES (Locus of High Points) and WATERCOURSE LINES (locus of low points)

Just food for thought.... Where we need to go to get ANUGA truly productive....

Regards Rudy