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  1. 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: Z -2.0 -3.0 -4.0 -5.0 -6.0 -7.0 -8.0 -9.0 -10.0 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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