Zpt Description - Revision history

Emilie Nielsen at 02:05, 8 January 2026

2026-01-08T02:05:48Z

← Older revision		Revision as of 12:05, 8 January 2026
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	[[File:Zpt Locations.png \| frame \| none]]		[[File:Zpt Locations.png \| frame \| none]]


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Emilie Nielsen: /* ZH Point */

2024-09-22T23:20:48Z

ZH Point

← Older revision		Revision as of 09:20, 23 September 2024
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	<br>		<br>

	The location of the four Zpt types are shown in the figure below. For more information, please refer to ~~Section~~ 4.~~4 of the 2010~~ TUFLOW ~~manual~~.		The location of the four Zpt types are shown in the figure below. For more information, please refer to the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>.

	[[File:Zpt Locations.png \| frame \| none]]		[[File:Zpt Locations.png \| frame \| none]]

Emilie Nielsen: /* ZC Point */

2024-09-22T23:20:37Z

ZC Point

← Older revision		Revision as of 09:20, 23 September 2024
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	* defines the volume of active water (storage). The cell volume is based on a flat square cell that wets and dries at the ZC height (plus the cell wet / dry depth);		* defines the volume of active water (storage). The cell volume is based on a flat square cell that wets and dries at the ZC height (plus the cell wet / dry depth);
	* controls when a cell becomes wet and dry (not cell sides can also wet and dry); and		* controls when a cell becomes wet and dry (not cell sides can also wet and dry); and
	* is used to determine the bed slope when testing for upstream controlled flow regime (refer to ~~TUFLOW~~ manual).		* is used to determine the bed slope when testing for upstream controlled flow regime (refer to the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>).

	== ZU and ZV Points==		== ZU and ZV Points==

Emilie Nielsen at 23:20, 22 September 2024

2024-09-22T23:20:23Z

← Older revision		Revision as of 09:20, 23 September 2024
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	This page gives a brief description of the Zpts. A more detailed description is contained in ~~section~~ 4.~~4 of the 2010~~ TUFLOW ~~manual~~.<br>		This page gives a brief description of the Zpts. A more detailed description is contained in the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>.<br>
	<br>		<br>
	The model topography is defined by elevations at the cell centres, mid-sides and cell corners. The TUFLOW Zpts are shown below as red points, the TUFLOW grid is shown as black squares. At each of these elevation points (Zpts) the elevation needs to be inputted into the TUFLOW model.		The model topography is defined by elevations at the cell centres, mid-sides and cell corners. The TUFLOW Zpts are shown below as red points, the TUFLOW grid is shown as black squares. At each of these elevation points (Zpts) the elevation needs to be inputted into the TUFLOW model.

tuflow>Par: Created page with "This page gives a brief description of the Zpts. A more detailed description is contained in section 4.4 of the 2010 TUFLOW manual.

The model topography is defined by el..."

2011-12-28T00:23:02Z

Created page with "This page gives a brief description of the Zpts. A more detailed description is contained in section 4.4 of the 2010 TUFLOW manual. The model topography is defined by el..."

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This page gives a brief description of the Zpts. A more detailed description is contained in section 4.4 of the 2010 TUFLOW manual. 
 
The model topography is defined by elevations at the cell centres, mid-sides and cell corners. The TUFLOW Zpts are shown below as red points, the TUFLOW grid is shown as black squares. At each of these elevation points (Zpts) the elevation needs to be inputted into the TUFLOW model.
 
[[File:Zpt Description1.png | Frame | None]]

The elevation points at locations around the TUFLOW cell are used for different purposes computationally. The following locations or types are of Zpts are referred to:
* ZC ("C" type), this is the cell centre or the middle of the cell;
* ZU ("U" type), this is the cell side in the x direction;
* ZV ("V" type), this is the cell side in the y direction; and
* ZH ("H" type), this is the cell corner.
 
One of the most important aspects of TUFLOW modelling is to understand the roles of the elevation points. A description of each of the zpt locations is given below, these locations a shown graphically in the figure at the end of the page.
== ZC Point ==
The ZC point:
* defines the volume of active water (storage). The cell volume is based on a flat square cell that wets and dries at the ZC height (plus the cell wet / dry depth);
* controls when a cell becomes wet and dry (not cell sides can also wet and dry); and
* is used to determine the bed slope when testing for upstream controlled flow regime (refer to TUFLOW manual).

== ZU and ZV Points==
The ZU and ZV points:
* control how much water is conveyed from one cell to another;
* are where the momentum equation terms are centred and where upstream controlled flow regimes are applied;
* are deactivated if the cell has dried (based on the ZC point) and cannot flow; and
* can wet and dry independently of the cell wetting and drying, which allows for modelling of "thin" obstructions such as fences. Such "thin" (relative to cell size) obstructions can be modelled by setting the cell side elevations, this does not change the storage in the model (calculated at ZC point).

== ZH Point ==
The ZH points:
* play no role hydraulically;
* are, by default, the only elevations written to the SMS .2dm (2D Mesh file). By default, all output is interpolated / extrapolated to the cell corners. This default can be overwritten, by using the .tcf command: 
<tt>Map Output Format == SMS High Res</tt>
 

The location of the four Zpt types are shown in the figure below. For more information, please refer to Section 4.4 of the 2010 TUFLOW manual.

[[File:Zpt Locations.png | frame | none]]

Zpt Description - Revision history

Emilie Nielsen at 02:05, 8 January 2026

Emilie Nielsen: /* ZH Point */

Emilie Nielsen: /* ZC Point */

Emilie Nielsen at 23:20, 22 September 2024

tuflow>Par: Created page with "This page gives a brief description of the Zpts. A more detailed description is contained in section 4.4 of the 2010 TUFLOW manual. The model topography is defined by el..."

tuflow>Par: Created page with "This page gives a brief description of the Zpts. A more detailed description is contained in section 4.4 of the 2010 TUFLOW manual.

The model topography is defined by el..."