8.1General Comments
Problems in the input data are effectively identified by using Write Check Files (.tcf file) and/or Write Check Files (.ecf file) to generate GIS check files. These files represent the final combination of the 2D and 1D data inputs and are excellent for identifying data input problems.
If the model becomes unstable, TUFLOW writes output data for the last timestep. The location of stability is easily found by viewing the results in SMS for the last timestep. Very large velocity vectors and/or excessively high or low water levels occur in the vicinity of the instability.
Always search the .elf and .tlf files for “UNSTABLE”, “WARNING”, “CHECK” and “ERROR” and use the _messages.mif files (see Section 6.2.1).
ERRORs stop the simulation, while WARNINGs and CHECKs do not. TUFLOW and ESTRY attempt to trap as many errors as possible before stopping to minimise the number of start-ups whilst setting up a model. It is possible that latter errors are caused by earlier errors, therefore, search through the .elf and .tlf files, or start at the beginning of the .mif attributes to find the first errors.
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