Tutorial M06: Difference between revisions
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Surface roughness or bed resistance values (e.g. Manning’s n) are assigned to material IDs. Depth varying roughness values are used in direct rainfall models to reflect the bed roughness at shallow depths. <br>
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<li>Copy the '''materials_M06_001.csv''' file from the '''Module_06\Tutorial_Data''' folder into the '''Module_06\TUFLOW\model''' folder. Depth
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[[File:M06 Materials 001.png]]<br>
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<li>For Material ID 1, 3 and 5, four numbers (y1, n1, y2, n2) are added to each row separated by commas and are applied as follows: <br>
:*Below depth y1 (m), a Manning’s n value of n1 is applied
:*Above depth y2 (m), a Manning’s n value n2 is applied
:*Between y1 and y2, the Manning’s n value is interpolated between n1 and n2. The default interpolation method uses a curved fit so that the n values transition gradually.
<li>For example, for Material ID 1, for depths of water below 0.03m a Manning's n value of 0.10 is applied. For depths of water greater than 0.1m, a Manning's n value of 0.06 is applied. Between 0.03 to 0.1m, a Manning's n value is interpolated between 0.1 and 0.06.
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