TUFLOW HR Output: Difference between revisions

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Revision as of 10:47, 21 August 2025 view source ShuangGao (talk \| contribs) Bureaucrats, Administrators 1,087 edits →Interpolation near Thin Breakline ← Older edit		Latest revision as of 13:07, 21 August 2025 view source Emilie Nielsen (talk \| contribs) Administrators 6,125 edits →Showing Face Elevations in _DEM_Z_HR Check File
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Line 95: Note the this feature (at present) only works for thin breaklines in Z Shape (2d_zsh) layers. Thick/wide breaklines raises more than 1 rows of cell centres and 2 rows of cell faces, and thus do not experience similar HR interpolation issue. =Showing Face ~~Elevation~~Elevations in ~~HR_Z~~_DEM_Z_HR Check File = When modelling breaklines in TUFLOW, thin breaklines modify the cell face elevations but do not modify the cell storages. When outputting the high-resolution outputs, the user can choose whether the cell face elevations are included using the following .tcf command. Thin breaklines are often used to define hydraulic controls, such as levees and road embankments. These controls often experience upstream controlled weir flow, where the water levels on the two sides of the breakline can be considerably different. Retaining just one water level (upstream, downstream or average) at output points along the breakline may result in unsatisfactory water level map output as illustrated in the two figures below. This issue becomes more profound the larger the 2D cell size. <font color="blue"><tt>HR Grid Output Use Face Elevations </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>{ON} \| OFF</tt></font> * “ON” (default): use face elevations in [[Check_Files_2d_DEM_Z_HR \| _DEM_Z_HR]] check file. This option accurately shows the cell faces where water can be hydraulically blocked. However, when cell faces are angled with the thin breakline, this can create 'pockets' of lower elevations in the check file that does not exist in reality. * “OFF”: Face elevations are not used in [[Check_Files_2d_DEM_Z_HR \| _DEM_Z_HR]] check file. This is an useful option for report writing, as 'clean' high resolution DEM images can be generated reflecting all geometry updates except for the Thin Breakline updates at cell faces. [[File:HR_Z_Use_Face_Elevations_ON.PNG\|480px]] [[File:HR_Z_Use_Face_Elevations_OFF.PNG\|480px]]<br> '''HR Grid Output Use Face Elevations == ON (left) and OFF (right)''' <br><br> {{Tips Navigation