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3D modelling of tidal environments - robust vertical discretisation

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A robust method for 3D modelling of tidal environments using TUFLOW FV is to adopt a hybrid z-coordinate vertical mesh (i.e. the vertical discretisation). Following this approach, fixed z-level coordinates are specified for water levels below the tidal range (i.e. the always wet levels) and sigma coordinates are used within the tidal range.


Example syntax for applying a hybrid z-coordinate vertical mesh is as follows:


vertical mesh type == z

layer faces == ..\geo\zfaces\zlayer_001.csv

sigma layers == 3


Where the zlayer_001.csv file contains the following z-levels:













In this example, the TUFLOW FV model would apply three (3) sigma layers between z = -2m and the tidally varying free surface. Note that the highest z-level should always be below the lowest expected water level.

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