Breach (Water Overlay): Difference between revisions

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A Breach area can be used to simulate a breach in a levee.
A Breach area can be used to simulate a breach in a levee or dam. It is identified via the [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute. Water flowing through the breach originates from a body of water. This body of water can be defined as an input area in the project or a conceptual external water body existing outside the project area. Water can flow through the breach from the input water body to the defined Breach area, and vice versa.  
 
==Overview==
 
A breach area can be defined via the [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute. It can have an input area or external area with a water body outside of the hydrological model. Water can flow through the breach form the input (or external area) into the breach area just behind the levee and vise versa.
 
Below a simple schematic of the breach elements.
 
Top Down
[[File:breach-side.png|left]]
{{clear}}
Side View
[[File:breach-top.png|left]]
{{clear}}
 
==Features==
* The breach can grow over time, based on its initial [[Breach_width_(Water_Overlay)|width]], [[Breach_speed_(Water_Overlay)|critical speed]] and inner and outer water level, for more details see [[Breach_growth_formula_(Water_Overlay)|Breach growth formula]].  
 
* Instead of using an input area you can also define a fictitious external area, this can repersent a larger water body outside the project area, e.g. the entire sea. The external area also has it's own [[External_surface_level_(Water_Overlay)|Surface level]], [[External_water_level_(Water_Overlay)|Water level]] and [[External_area_(Water_Overlay)|Area]].
 
* If a [[Breach_width_(Water_Overlay)|BREACH_WIDTH]] attribute is defined, the breach's polygon is intersected with a circle emanating from the centerpoint of the polygon. It is only in that intersection, called "active", that water will flow in from the input area. The radius of the circle defining the intersection will expand as water flows.
 
* Water flowing through or across a breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. When no [[Breach_angle_(Water_Overlay)|BREACH_ANGLE]] is defined, water can flow in any direction. Adding this attribute with also convert the breach advection speed (m/s) into the 2D cell of the breach area. It is recommended to always use this attribute for optimal flow.
 
* If no [[Breach_speed_(Water_Overlay)|BREACH_SPEED]] attribute is defined, the active breach will never grow. If no width is defined, the width is assumed to be very large, creating an intersection exactly the size of the polygon.
 
* The [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute can also have multiple values over time, this allows you this simulate the breach vertical growth.
 
==Notes==
 
* The elevation map covered by the entire breach area is adjusted to at least the minimum height defined by its [[Breach_height_(Water_Overlay)|BREACH_HEIGHT]] attribute. This is to prevent the terrain height from interfering with the flow.
 
* When using breach growth the inner water level is computed from the average value in the active breach area. For optimal flow simulation it is therefor recommended to place the breach area just behind the levee on a flat space.
 
* Water on a breach area is automatically spread across the entire active breach area equally.
 
* The inner and outer water levels are visualized per timeframe on the breach object in the 3D map, these can be very useful to see how the breach is progressing.
 
* The [[Base_types_result_type_(Water_Overlay)]] can be used to see which part of entire the breach area is considered "active". Breach growth can be seen when checking multiple timeframes.
 


==Attributes==
{{Overlay keys|suppresscategory=true|
{{Overlay keys|suppresscategory=true|
{{:breach height (Water Overlay)}}
{{:breach height (Water Overlay)}}
{{:breach width (Water Overlay)}}
{{:breach width (Water Overlay)}}
{{:breach angle (Water Overlay)}}
{{:breach angle (Water Overlay)}}
{{:breach coefficient (Water Overlay)}}
{{:breach speed (Water Overlay)}}
{{:breach speed (Water Overlay)}}
{{:breach input area (Water Overlay)}}
{{:breach input area (Water Overlay)}}
{{:breach level area (Water Overlay)}}
{{:external surface level (Water Overlay)}}
{{:external surface level (Water Overlay)}}
{{:external water level (Water Overlay)}}
{{:external water level (Water Overlay)}}
{{:external area (Water Overlay)}}
{{:external area (Water Overlay)}}
}}
==Overlay attributes==
{{overlay attributes|suppresscategory=true|allowselflinks=true|
{{:breach measurement distance m (Water Overlay)}}
}}
}}


{{article end
{{article end
|notes=
* [[Breach (Water Overlay)|Breach]]es can only be configured for [[Flooding Overlay]]s.
|howtos=
|howtos=
*[[How to add a breach with external area manually]]
*[[How to add a breach with external area manually]]
*[[How to add a breach with input area manually]]
*[[How to add a breach with input area manually]]
*[[How to add a breach level area to a breach]]
*[[How to import a breach with input area]]
*[[How to import a breach with input area]]
*[[How to set dynamic breach height]]
*[[How to set dynamic breach height]]
*[[How to visualize multiple sequential breaches (Water Overlay)]]
*[[How to visualize multiple sequential breaches (Water Overlay)]]
*[[How to inspect breach output attributes of an overlay using the measurement tool]]
|seealso=
|seealso=
* [[Breach model (Water Overlay)]]
* [[Elevation model (Water Overlay)]]
* [[Elevation model (Water Overlay)]]
* [[Breach growth formula (Water Overlay)]]
* [[Breach growth formula (Water Overlay)]]
* [[Breach flow formula (Water Overlay)]]
* [[Breach flow formula (Water Overlay)]]
|videos=
* [[Object width output (Water Overlay)]]
{{video|link=G2DNGtdUOO8|lang=dutch|description=Modeling breach growth}}
}}
}}
{{WaterOverlay hydrological features nav}}
{{WaterOverlay hydrological features nav}}

Latest revision as of 15:22, 30 January 2024

A Breach area can be used to simulate a breach in a levee or dam. It is identified via the BREACH_HEIGHT attribute. Water flowing through the breach originates from a body of water. This body of water can be defined as an input area in the project or a conceptual external water body existing outside the project area. Water can flow through the breach from the input water body to the defined Breach area, and vice versa.

Attributes

Overlay attributes