Flooding Overlay: Difference between revisions

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==What is the Inundation overlay==
[[File:FloodingOverlay2.png|right|thumb|200px|Flooding overlay]]
The inundation is developed for the computation of surface (water) flow in a wide range of applications. These applications include large scale inundations due to dike breaches and inundations at the bottom of hill-slopes. Therefore the commonly applied 2D Saint Venant Equations are implemented on a highly parallel applicable explicit numerical scheme suitable for Tygron GPU clusters.
The Flooding Overlay is a variant of the [[Water Overlay]], which in turn is a [[Grid overlay|grid overlay]]. Water overlays are connected to the [[Water Module]], a complex hydrological calculation module within the {{software}}.  


==2D Saint Venant equations==
The Flooding Overlay calculates and visualizes the movement of water over land, due to a [[Breach_(Water_Overlay)|breach]] or other [[Inlet_(Water_Overlay)|inflow]] of water in the project area.
The 2D Saint Venant equations describe the conservation of mass in a gridcell and the conservation of momentum in both x and y, direction:


[[File:Inundation_overlay_01.PNG]]
In order to get more familiar with the different components of the Flooding Overlay check out Quadrant 1 of the [[Testbed_water_module|Water Module Testbed]]. This Testbed is available to you as a project in the {{software}}.


The Saint Venant equations describe the following processes:
==Flooding overlay results==
* friction
The Flooding Overlay is a Water Overlay that is connected to the Water Module. This Water Module performs two dimensional grid based water simulations for a large set of input data and parameters, configured mostly through a related [[Water_Overlay_Wizard|Water Overlay Wizard]]. When a simulation finishes, the module stores the result in the Flooding overlay based on the selected result type. Only one result type can be stored per Flooding overlay.
* bed slope
* water pressure
* convection (changes in bathemetry over space)
* inertia (increase or decrease of velocity over time)


==Numerical scheme==
The Water Module however, is not restricted to generating only one type of result. Instead it can produce multiple unique result types for one single simulation.  
The Tygron Engine Inundation module relies on an explicit finit volume method, taken from Kurganov and Petrova (2007). This scheme relies on a reconstruction of cell bottom, water level and velocity at the interfaces between computational cells as proposed by Lax and Wendroff (see Rezzolla, 2011). The reconstruction method, taken from Bolderman et all (2014) ensures numerical stability at the wetting and drying front of a flood wave.
Fortunately it is possible to add additional result type overlays which relate to a particular Rainfall overlay. These are known as [[Result Child Overlay]]s. Again, each child overlay only stores one particular result type.


==Computational time step==
Apart from multiple result types, the Flooding overlay can also store result data of multiple, intermediate simulation results, instead of just a single end result. These intermediate simulation results are known as [[Timeframes_(Water_Overlay)|timeframes]].


For the full list of result types, see [[Result type (Water Overlay)#List of Result Types|List of Result Types]].
For other results, which are not overlay results, but still related to the simulation of a Flooding overlay, see [[Results (Water Overlay)|water overlay results]]


==References==
==Module==
* Rezzolla  L (2011) ∙ Numerical Methods for the Solution of Partial Differential Equations
A Flooding Overlay can be configured by opening the Flooding Overlay Wizard. More in-depth information can be found under each of the categories below.  
* Bollermann A, Chen G, Kurganov A and Noelle S (2014) ∙ A Well-Balanced Reconstruction For Wetting/Drying Fronts ∙ found at: https://www.researchgate.net/publication/269417532_A_Well-balanced_Reconstruction_for_Wetting_Drying_Fronts (last visited 2018-06-29)
{{Water Module buttons}}
* Kurganov A, Petrova G (2007) ∙ A Second-Order Well-Balanced Positivy Preserving Central-Upwind Scheme for the Saint-Venant System ∙ found at: http://www.math.tamu.edu/~gpetrova/KPSV.pdf (last visited 2018-06-29)
 
{{WaterOverlay output nav}}
{{Overlay nav}}

Latest revision as of 13:46, 17 January 2023

Flooding overlay

The Flooding Overlay is a variant of the Water Overlay, which in turn is a grid overlay. Water overlays are connected to the Water Module, a complex hydrological calculation module within the Tygron Platform.

The Flooding Overlay calculates and visualizes the movement of water over land, due to a breach or other inflow of water in the project area.

In order to get more familiar with the different components of the Flooding Overlay check out Quadrant 1 of the Water Module Testbed. This Testbed is available to you as a project in the Tygron Platform.

Flooding overlay results

The Flooding Overlay is a Water Overlay that is connected to the Water Module. This Water Module performs two dimensional grid based water simulations for a large set of input data and parameters, configured mostly through a related Water Overlay Wizard. When a simulation finishes, the module stores the result in the Flooding overlay based on the selected result type. Only one result type can be stored per Flooding overlay.

The Water Module however, is not restricted to generating only one type of result. Instead it can produce multiple unique result types for one single simulation. Fortunately it is possible to add additional result type overlays which relate to a particular Rainfall overlay. These are known as Result Child Overlays. Again, each child overlay only stores one particular result type.

Apart from multiple result types, the Flooding overlay can also store result data of multiple, intermediate simulation results, instead of just a single end result. These intermediate simulation results are known as timeframes.

For the full list of result types, see List of Result Types. For other results, which are not overlay results, but still related to the simulation of a Flooding overlay, see water overlay results

Module

A Flooding Overlay can be configured by opening the Flooding Overlay Wizard. More in-depth information can be found under each of the categories below.

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Water Module
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Water Module
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Tutorials
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Overview
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Group
Output keys
Object flow output • Object height output • Object datum output a • Object datum output b • Object width output
Output other
Result type • Water balance • System visualization • Weather visualization • Debug info
Related
Building attributes • Hydraulic structures • Hydrological features •  Terrain attributes • Model attributes • Simulation data
Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability • Aerius
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed • Waterwijzer
Raster Calculation
Average • Combo • Distance • Sight Distance • Travel Distance
Geo Data
Area • Attribute • GeoTIFF • WCS • WMS • Image
Topography
Digital Surface Model • Digital Terrain Model • Underground • Function • Source
Network
Network Distance • Network Overview • Network Ownership


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