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Small steep ISIS channels and TUFLOW

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We have an ISIS TUFLOW model that is proving a little problematic and any pearls of wisdom would be gratefully received. The 1D network represents a small, narrow, steep channel with many closely spaced structures. We have rationalised the set up and simplfied the system so that the ISIS model works ok, but when coupled with the TUFLOW model it is taking longer than "normal" to stabilise the coupled model.

Before we seriously consider alternative modelling options, does anyone have any tips for such models? Will modification of any of the ISIS or TUFLOW parameters aid stability for small steep channels embedded into a fine TUFLOW grid??

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