Water Overlay: Difference between revisions

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A water overlay is an [[Overlay|overlay]] for which results are calculated by the [[Water Module]]. The [[Water Module]] in the {{software}} 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. Its calculations form a simulation of an arbitrary amount of time, during which water is allowed to move.
A water overlay is an [[Overlay|overlay]] for which results are calculated by the [[Water Module]]. The [[Water_module_introduction|Basic theory of the Water Module]] in the {{software}} 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. Its calculations form a simulation of an arbitrary amount of time, during which water is allowed to move.


To perform the calculations, the project area is divided into a [[Grid overlay|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 [[Timestep formula (Water Overlay)|timesteps]]. Per timestep, each cell communicates with its adjacent cells to exchange water, based on it's 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.
To perform the calculations, the project area is divided into a [[Grid overlay|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 [[Timestep formula (Water Overlay)|timesteps]]. Per timestep, each cell communicates with its adjacent cells to exchange water, based on it's 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.

Revision as of 13:30, 29 April 2019

A water overlay is an 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. Its calculations form a simulation of an arbitrary amount of time, during which water is allowed to move.

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 it's 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

The water module can be called upon by adding one of the following overlays to a project. Each variant has a number of parameters tuned to best fit specific use-cases.

Overlay rainfall.png Rainfall Overlay provides insight into the water stress and impact caused by (excessive) rainfall
Overlay flooding.png Flooding Overlay provides insight into water stress and impact caused by breaches in levees or other sources causing excessive water inflow
Overlay groundwater.png Groundwater Overlay provides insight into long-term processes of water flow both on the surface and underground

Results

A water overlay generates different results. For further information about these outcomes, see also results and result types.

How-to's