Breach height (Water Overlay): Difference between revisions

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{{Overlay attribute
{{Overlay keys|<onlyinclude>
|attribute=[[Breach_height_(Water_Overlay)|BREACH_HEIGHT]]
{{Overlay keys|type=row|group=Water Overlay
|key=BREACH_HEIGHT
|unit={{mdatum}}
|unit={{mdatum}}
|description=The new [[terrain height (Water Overlay)|terrain height]] at the location of the breach.  
|description=The new [[terrain height (Water Overlay)|terrain height]] at the location of the breach.  
|defaultvalue=n/a
|defaultvalue=n/a
|icon=[[File:waterwizard_icon_breach_height.png]]
|icon=waterwizard_icon_breach_height.png
}}</onlyinclude>}}
 
==Array==
This attribute can be defined as [[time sequence (Water Overlay)|values over time]], using an array of values defining {{time sequence interpolated}}. This allows users to more dynamically define the height used in the [[Breach_flow_formula_(Water_Overlay)|Breach flow formula]].
 
=====Example=====
A levee with a datum height of 4 m is breached after 1800 seconds. It lowers down to -4.15 m in 900 seconds.
 
This can be simulated with the following array: 0 4 1800 4 2700 -4.15
 
The height value (h) used is:
* h = 4 between 0 and 1800 seconds;
* h = linearly interpolated between 4 and -4.15 based on time t within 1800 and 2700 seconds;
* h = -4,15 m after 2700 seconds.
 
{{article end
|notes=
* The initial surface height at the breach (both active and inactive) cells are lowered to the lowest value of the defined breach height array. This means that the elevation model immediately has a "hole" where the breach can potentially be. The breach height values of the array are only used for the computation of water flowing ''through'' the breach, not over its Area.
* The breach height as an array can also be used to stop a breach from flowing in water after x amount of seconds. However, as mentioned in the note above, it cannot be used to raise the actual surface height in the simulated area.
* When using a dynamic BREACH_HEIGHT, a maximum of {{array max|pairs}} can be defined.
|howtos=
*[[How to set dynamic breach height]]
|seealso=
* [[Elevation model (Water Overlay)]]
* [[Breach growth formula (Water Overlay)]]
}}
}}
==Notes==
* The Breach height attribute can be defined as values over time, using an [[attribute array]]. This allows users to more dynamically define the height used in the [[Breach_flow_formula_(Water_Overlay)|Breach flow formula]].
* The initial surface height at the breach (both active and inactive) cells are lowered to the lowest value of the defined breach height array.
==See also==
* [[Elevation model (Water Overlay)|Elevation model]]
* [[Breach growth formula (Water Overlay)|Breach growth formula]]


{{WaterOverlay hydrological features nav}}
{{WaterOverlay hydrological features nav}}

Latest revision as of 08:38, 23 June 2022

Icon Key Unit Range Description Default value
Waterwizard icon breach height.png BREACH_HEIGHT m + datum The new terrain height at the location of the breach. n/a

Array

This attribute can be defined as values over time, using an array of values defining interpolation-time. This allows users to more dynamically define the height used in the Breach flow formula.

Example

A levee with a datum height of 4 m is breached after 1800 seconds. It lowers down to -4.15 m in 900 seconds.

This can be simulated with the following array: 0 4 1800 4 2700 -4.15

The height value (h) used is:

  • h = 4 between 0 and 1800 seconds;
  • h = linearly interpolated between 4 and -4.15 based on time t within 1800 and 2700 seconds;
  • h = -4,15 m after 2700 seconds.

Notes

  • The initial surface height at the breach (both active and inactive) cells are lowered to the lowest value of the defined breach height array. This means that the elevation model immediately has a "hole" where the breach can potentially be. The breach height values of the array are only used for the computation of water flowing through the breach, not over its Area.
  • The breach height as an array can also be used to stop a breach from flowing in water after x amount of seconds. However, as mentioned in the note above, it cannot be used to raise the actual surface height in the simulated area.
  • When using a dynamic BREACH_HEIGHT, a maximum of 10.000 values (5.000 pairs) can be defined.

How-to's

See also

Water Module
Benchmarks button.png
Introduction button.png
Water Module
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
Benchmarks
Group
Water area
Water level • Water relative
Sewer area
Sewer storage • Sewer pump speed
Inundation area
Inundation level
Aquifer
Aquifer kd • Aquifer datum
Breach
Breach height • Breach width • Breach angle • Breach coefficient • Breach speed • Breach input area • Breach level area • External surface level • External water level • External area
Rain area
Rain m
Limitation area
Limit area
Output
Object flow output • Object height output • Object datum output a • Object datum output b • Object width output
Related
Building attributes • Hydraulic structures •  Terrain attributes • Model attributes • Results • Simulation data
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