Changeset 2729
- Timestamp:
- Apr 19, 2006, 6:15:06 PM (19 years ago)
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documentation/user_manual/anuga_user_manual.tex
r2727 r2729 1834 1834 \subsubsection{Which diagnostics are available to troubleshoot a simulation?} 1835 1835 1836 \subsubsection{How do I use a DEM in my simulation?} 1837 You use \code{dem2pts} to convert your DEM to the required .pts format. This .pts file is then called When setting the elevation data to the mesh 1838 in \code{domain.set_quantity} 1839 1840 \subsubsection{What sort of DEM resolution should I use?} 1841 Try and work with the "best" you have available. Onshore DEMs are typically available in 25m, 100m and 250m grids. Note, offshore data is often sparse, 1842 or non-existant. 1843 1844 \subsubsection{What sort of mesh resolution should I use?} 1845 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, 1846 if your DEM is on a 25m grid, then the cell resolution should be of the order of 315$m^2$ (this represents half the area of the square grid). Ideally, 1847 you need a fine mesh over regions where the DEM changes rapidly, and other areas of significant interest, such as the coast. 1848 1849 \subsubsection{How often should I store the output?} 1850 This will depend on what you are trying to answer with your model and how much memory you have available on your machine. If you need 1851 to look in detail at the evolution, then you will need to balance against your storage requirements and the duration of the simulation. 1852 If the sww file exceeds 1Gb, another sww file will be created until the end of the simulation. As an example, to store all the conserved 1853 quantities on a mesh with approximately 300000 triangles on a 2 min interval for 5 hours will result in approximately 350Mb sww file. 1854 1836 1855 \subsection{Boundary Conditions} 1837 1856
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