Modelling Accuracy Uncertainties Impact Mapping: Difference between revisions
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Chris Huxley (talk | contribs) Created page with "=What are the reasons why models vary widely in their accuracy?= * The level of uncertainty/inaccuracy in the input data, especially uncertainties in hydrological inflows (whi..." |
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=I am running existing and developed case and see differences away from the model changes. Why?=
Any geometry changes between models, no matter how small, will affect results, sometimes to a greater degree than that occurring in the area of change. For example, a few millimetres increase in water level can determine whether or not overtopping of an embankment occurs, and this can consequently cause even larger impacts on the downstream side of the embankment. Furthermore, these changes can be compounded by subsequent changes in timestepping when using the adaptive timestepping option (the default in TUFLOW HPC), especially at fringes of the flood extent, where cells are constantly wetting and drying. Modellers and reviewers should be judicious and pragmatic when assessing which impacts are real and which are numerical noise.<br>
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