Changes between Version 2 and Version 3 of ModellingQuestions

Timestamp:

Oct 20, 2008, 1:41:26 PM (15 years ago)

Author:

rwilson

Comment:

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ModellingQuestions

@@ -68 +68 @@
 without exceeding available memory. One tool available on the net is called 'decimate'. (Need reference?).
 
+== What sort of mesh resolution should I use? ==
+
+The mesh resolution should be commensurate with your DEM - it does not make sense to put in place a mesh which is finer than your DEM. As an example,
+if your DEM is on a 25m grid, then the cell resolution should be of the order of 315 square metres (this represents half the area of the square grid).
+Ideally, you need a fine mesh over regions where the DEM changes rapidly, and other areas of significant interest, such as the coast.
+If meshes are too coarse, discretisation errors in both stage and momentum may lead to unrealistic results. All studies should include sensitivity and convergence studies based on different resolutions.