Water Overlay: Difference between revisions
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==Quick overview== | ==Quick overview== | ||
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===Features and components=== | ===Features and components=== | ||
* [[Hydrological features (Water Overlay)|Hydrological features]] | * [[Hydrological features (Water Overlay)|Hydrological features]] | ||
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* [[Hydrological attributes of terrains (Water Overlay)|Hydrological Attributes of Terrains]]<br> | * [[Hydrological attributes of terrains (Water Overlay)|Hydrological Attributes of Terrains]]<br> | ||
{{Template:Overlay nav}} | {{Template:Overlay nav}} | ||
[[Category:Overlays with result types]] | [[Category:Water Module]][[Category:Overlays with result types]] | ||
Revision as of 07:46, 1 September 2020
A Water Overlay is a grid overlay for which results are calculated by the Water Module. The Basic theory of the Water Module in the Tygron Platform is an implementation of a 2D grid based shallow water model based on the 2D Saint Venant equations. The module is further enhanced with infiltration, evaporation, groundwater flow and hydraulic structures. Depending on the use case, the simulated period can be set to few seconds and up to a few months. The theory section describes in detail how calculations are performed.
To perform the calculations, the project area is divided into a grid of cells. Each cell has a specific quantity of water and specific hydrological parameters based on the data in the project. The total time which should be simulated is divided into discrete timesteps. Per timestep, each cell communicates with its adjacent cells to exchange water, based on its water level, surface height, current flow direction and other factors. Accuracy and reliability is obtained by dividing the project area and simulation time into sufficiently small cells and steps, at the cost of more computation time.
The final results of the calculation can be inspected, as well as intermediate snapshots of the hydrological situation during the simulation, known as timeframes.
Variants
A Water Module will be initialized by adding one of the following Overlays to a project. Each variant has a number of parameters tuned to best fit specific use-cases. This means that each of these overlays is based on the same theory and calculation method, however they are customized to conveniently provide insight in different aspects of the Water Module.
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Rainfall Overlay | provides insight into the water stress and impact caused by (excessive) rainfall |
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Flooding Overlay | provides insight into water stress and impact caused by breaches in levees or other sources causing excessive water inflow |
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Groundwater Overlay | provides insight into long-term processes of water flow both on the surface and underground |
Results
With a Water Overlay, a user can generate multiple results for a single water simulation. For further information about these outcomes, see also results and result types.
How-to's
- How to add and remove an Overlay
- Configure a Water Overlay
- Edit an overlay legend
- Combine with Subsidence Overlay
Quick overview
Features and components
Attributes
- Water Module Attributes
- Hydrological Attributes of Constructions
- Hydrological Attributes of Terrains