Visualize levee breach from water body outside project area use case (Water Overlay): Difference between revisions

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(Created page with "In this scenario we want to simulate a levee breach near an adjacent water body, ''but in this case, the water body is not fully in 3D in the project.'' For example, if your p...")
 
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In this scenario we want to simulate a levee breach near an adjacent water body, ''but in this case, the water body is not fully in 3D in the project.'' For example, if your project is of a part of Flevoland and you don't want to create a project of the whole IJsselmeer, you can simulate the flooding by the IJsselmeer.
When a levee breaks water is free to flow through the breach and onto otherwise dry land. There are multiple ways of simulating a breach in a levee.
In this scenario you would not want to have the breach connected to the water body, since we are not going to import the water level of this water body. This means the water body will not have a water level and thus the flooding will go to the lowest point which is probably to the water body and not the land.  


In the steps here, the breach area is drawn in the Editor. It is also possible to import a [[GeoJSON]] file with the location of the breach.
This scenario assumes the water body from which water will flow through the levee is either too large to fit in the project area, or is not present in the data of the project for other reasons.


{{Editor steps|title= set-up the breach area
==Steps==
|In the Editor go to GEO Data --> Areas
The use-case can be implemented/completed through the following steps.
|Add a new area by clicking in the bottom left corner.
{{Editor steps|title=visualize a breach
|Select the newly created area (named Area) and give it a fitting name on the right
|[[How to add and remove an Overlay|Add a Flooding Overlay]].
|Zoom in to the location where you want to have the breach and click on the Adjust area button
|Configure the Overlay with a [[Basic water model use case (Water Overlay)|basic hydrological system]].
|Select the location of your breach and click on Apply settings. Make sure the breach is not connected to the water body and ideally draw it on the inside of the dike.
|[[How to add and remove a Result type|Add a Result type]] of type '[[Surface last value result type (Water Overlay)|Surface last value]]' to the Overlay (if the result type was not yet present).
|Go to the tab attributes and add the [[Flooding_(Overlay)#Define_a_Breach_area|breach floor attribute]] and the [[Flooding_(Overlay)#Define_a_Breach_area|outlet capacity]]. The outlet capacity is the volume of the waterbody. Also add either the [[Flooding_(Overlay)#Define_a_Breach_area|outlet Q]] or the [[Flooding_(Overlay)#Define_a_Breach_area|outlet level]] to determine how much water will flow through the breach.  
|Either [[How to add a breach with external area manually|manually add a breach with external area attributes]] to the project, or [[How to import a breach with external area|import a breach with external area attributes]].
|Ensure the Overlay is [[Calculation_panel|(re)calculated]].
|Inspect the 'Surface last value' result.
|Select the 'play' option in the Overlay's legend. The animation will show the flow of the water from the breach.
}}
}}
<gallery mode=nolines>
File:Breach_scenario_2.JPG
</gallery>


{{Editor steps|title= configure the flooding
==Notes==
|Then follow the steps above to configure the flooding.
Multiple breaches can be added to the same project, by repeating the step for adding breaches to the project.
|In step 2.2 when you import the water level areas, don't import the water level area for the large water body near your breach area.
 
|Finish the Wizard and refresh the Overlay.  
{{WaterOverlay usecases nav}}
|After the flooding is calculated, check the [[Water_Overlay#Show_Water_Balance|Water Balance]] to get more insight in your scenario.
}}
<gallery mode=nolines>
File:Waterbalance_scenario2.JPG
</gallery>

Latest revision as of 11:57, 20 November 2019

When a levee breaks water is free to flow through the breach and onto otherwise dry land. There are multiple ways of simulating a breach in a levee.

This scenario assumes the water body from which water will flow through the levee is either too large to fit in the project area, or is not present in the data of the project for other reasons.

Steps

The use-case can be implemented/completed through the following steps.

How to visualize a breach:
  1. Add a Flooding Overlay.
  2. Configure the Overlay with a basic hydrological system.
  3. Add a Result type of type 'Surface last value' to the Overlay (if the result type was not yet present).
  4. Either manually add a breach with external area attributes to the project, or import a breach with external area attributes.
  5. Ensure the Overlay is (re)calculated.
  6. Inspect the 'Surface last value' result.
  7. Select the 'play' option in the Overlay's legend. The animation will show the flow of the water from the breach.

Notes

Multiple breaches can be added to the same project, by repeating the step for adding breaches to the project.

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Water system model
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Visualize levee breach from water body inside project area use case
Visualize levee breach from water body outside project area use case
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