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TUFLOW HR Output: Difference between revisions

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Please also note that it is not necessary to use these options for non-rainfall on grid models.
 
=Interpolation near Thin BreaklineBreaklines =
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.
 
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'''HR Thin Z Line Output Adjustment == OFF'''
 
A new HR output feature has been introduced to improve the water level interpolation along thin breaklinebreaklines.
AnyFor any further questions please email TUFLOW support: [mailto:support@tuflow.com?Subject=TUFLOW%201D%20gates%20help support@tuflow.com]
 
<font color="blue"><tt>HR Thin Z Line Output Adjustment </tt></font> <font color="red"><tt>== </tt></font> <font color="black"><tt>OFF | {ON CELL SIDES} | ON ALIGNMENT</tt></font>
 
* “OFF”OFF: does not apply any water level adjustment.
* “ONON CELL SIDES”SIDES (default): two water levels, rather than one, are stored at cell corners selected by thin breaklines. These water levels are used to interpolate HR water levels on either side of thin breaklines. This option produces a sudden drop in water level across the breakline as illustrated in the figure below, noting the sudden drop follows the 2D cell faces where the breakline is applied.
* “ONON ALIGNMENT”ALIGNMENT: As an extension to the “ON CELL SIDES” option, this method moves and aligns the 2D cell corner vertices to the original alignment of the breakline for producing HR water level and depth. The arrows in the figure below show how vertices of the TIN are moved to align with the breakline. This can produce substantially improved high-resolution mapping along thin breaklines with substantial drops in water levels, especially for larger 2D cell sizes. Note that the cell corners are NOT shifted for the hydraulic calculations.
 
[[File:HR_thin_brk_on.png|480px]] [[File:HR_thin_brk_on_adj.png|480px]]<br>
'''HR Thin Z Line Output Adjustment == ON CELL SIDES (left) and ON ALIGNMENT (right)'''
 
Note: this feature (at present) only works for thin breaklines in Z Shape (2d_zsh) layers. Thick/wide breaklines raise more than 1 rowsrow of cell centres and 2 rows of cell faces, and thus do not experience similarthis HR interpolation issue.
 
=Showing Face Elevations in _DEM_Z_HR Check File =
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