Water Overlay ground model cheatsheet: Difference between revisions

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{{cheatsheet|columns=2|
{{cheatsheet|columns=2|
{{cheatsheet-block
{{cheatsheet-block
|title=Core principles
|title=Core principles
|type=description
|type=description
|text=In the 2-dimensional grid model of the {{software}}, water infiltrates from the surface, infiltrates through the unsaturated zone and is partially stored, after which it reaches the saturated zone. Here, horizontal flow occurs, depending on hydraulic gradients and permeability, and everything is simulated in a time-dependant context. There is '''no''' vertical (and no radial) flow in the saturated zone.
|text= Tygron consists of a 2D grid model with a time component. An aquifer and a aquitard can be modelled. The following geohydrological processes can be simulated:
# Infiltration,
# Flow through the unsaturated zone in vertical direction;
# Flow in the saturated zone in horizontal direction;
# Groundwater from the saturated zone can seep away or be replenished through a aquitard layer.
|image=
|image=
|table=
|table=
}}
}}
{{cheatsheet-block
|title=Infiltration
|type=parameters
|datatype=Terrain Type: Attributes
|datatypelink=Hydrological attributes of terrains (Water Overlay)
|text= Formula used: [[Surface infiltration formula (Water Overlay)]]
|image=
|table=
  {{{!}}
  ! Parameter !! Attribuut in Tygron !! Symbol !! Unit
  {{!}}-
  {{!}} Infiltration speed of the building
{{!}}{{!}} GROUND_INFILTRATION_MD
{{!}}{{!}} I<sub>building</sub>
{{!}}{{!}}  m/d
  {{!}}-
  {{!}}-
  {{!}} Infiltration speed of the terrain
{{!}}{{!}} GROUND_INFILTRATION_MD
{{!}}{{!}} I<sub>terrain</sub>
{{!}}{{!}}  m/d
  {{!}}-
  {{!}}-
  {{!}} Infiltration speed of the ground
{{!}}{{!}} GROUND_INFILTRATION_MD
{{!}}{{!}} I<sub>ground</sub>
{{!}}{{!}}  m/d
  {{!}}-
  {{!}}-
  {{!}} Effective infiltration speed.
{{!}}{{!}} GROUND_INFILTRATION_MD
{{!}}{{!}} I<sub>surface</sub>
{{!}}{{!}}  m/d
  {{!}}}
  }}
{{cheatsheet-block
{{cheatsheet-block
|title=Unsaturated zone
|title=Unsaturated zone
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   {{!}}}
   {{!}}}
}}
}}
{{cheatsheet-block
{{cheatsheet-block
|title=Saturated zone
|title=Saturated zone
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   {{!}}}
   {{!}}}
}}
}}
{{cheatsheet-block
{{cheatsheet-block
|title=Simulation modes
|title=Simulation modes
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   {{!}}}
   {{!}}}
}}
}}
{{cheatsheet-block
{{cheatsheet-block
|title=
|title=
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|image=Water_module_flows.jpeg
|image=Water_module_flows.jpeg
|table=
|table=
}}
{{cheatsheet-block
|title=Output Overlays
|type=results
|datatype=Water Overlay Result Types
|datatypelink=Result type (Water Overlay)
|text=
|image=
|table=
  {{{!}}
  ! Mode !! Description
  {{!}}-
  {{!}} GROUND_WATERTABLE {{!}}{{!}}  Groundwater level, in meters relative to reference datum.
  {{!}}-
  {{!}} GROUND_WATERTABLE_WITH_SURFACE {{!}}{{!}}  Combines GROUND_WATERTABLE with water on the surface when groundwater level is near the surface.
  {{!}}-
  {{!}} GROUND_FLOW          {{!}}{{!}}  Horizontal flow of groundwater.
  {{!}}-
  {{!}} GROUND_BOTTOM_FLOW          {{!}}{{!}} Groundwater flow via the bottom of the saturated zone.
  {{!}}-
  {{!}} GROUND_LAST_STORAGE          {{!}}{{!}}  Current amount of water in the unsaturated and saturated zones combined.
  {{!}}-
  {{!}} GROUND_MAX_STORAGE        {{!}}{{!}}  Highest recorded amound of water in the unsaturated and saturated zones combined.
  {{!}}-
  {{!}} GROUND_LAST_UNSATURATED_STORAGE        {{!}}{{!}}  Amount of water in the unsaturated zone.
  {{!}}-
  {{!}} GROUND_LAST_UNSATURATED_FRACTION        {{!}}{{!}}  Fraction of total amount of storage available in unsaturated zone which is actually filled with water.
  {{!}}-
  {{!}} EVAPORATED        {{!}}{{!}}  Total evaporation recorded, including evapotranspiration through vegetation.
  {{!}}}
}}
}}


}}
}}

Latest revision as of 09:02, 16 March 2025


Core principles

Tygron consists of a 2D grid model with a time component. An aquifer and a aquitard can be modelled. The following geohydrological processes can be simulated:

  1. Infiltration,
  2. Flow through the unsaturated zone in vertical direction;
  3. Flow in the saturated zone in horizontal direction;
  4. Groundwater from the saturated zone can seep away or be replenished through a aquitard layer.


Infiltration Terrain Type: Attributes

Formula used: Surface infiltration formula (Water Overlay)

Parameter Attribuut in Tygron Symbol Unit
Infiltration speed of the building GROUND_INFILTRATION_MD Ibuilding m/d
Infiltration speed of the terrain GROUND_INFILTRATION_MD Iterrain m/d
Infiltration speed of the ground GROUND_INFILTRATION_MD Iground m/d
Effective infiltration speed. GROUND_INFILTRATION_MD Isurface m/d



Unsaturated zone Terrain Type: Attributes
Parameter Unit Description
UNSATURATED_FRACTION fraction Initial value saturation
E.g. 0.5 means pores are 50% filled with water.
WATER_STORAGE_PERCENTAGE m³/m³ Effective porosity. Determines water storage capacity.
GROUND_INFILTRATION_MD m/day Maximum infiltration speed in this type of terrain.


Saturated zone Terrain Type: Attributes
Parameter Unit Description
HYDRAULIC_CONDUCTIVITY m/day Horizontal conductivity.
HYDRAULIC_CONDUCTIVITY_WITH_THICKNESS_MD m²/day Horizontal conductivity corrected for layer thickness.


Simulation modes Water Overlay Wizard
Mode Description
None No groundwater processes are simulated. Surface is impermeable.
Infiltration only Only infiltration into the unsaturated zone is simulated.
Storage is defined by MAX_INFILTRATION_M.
Complete Complete simulation of infiltration, flow, and evaporation.



Output Overlays Water Overlay Result Types
Mode Description
GROUND_WATERTABLE Groundwater level, in meters relative to reference datum.
GROUND_WATERTABLE_WITH_SURFACE Combines GROUND_WATERTABLE with water on the surface when groundwater level is near the surface.
GROUND_FLOW Horizontal flow of groundwater.
GROUND_BOTTOM_FLOW Groundwater flow via the bottom of the saturated zone.
GROUND_LAST_STORAGE Current amount of water in the unsaturated and saturated zones combined.
GROUND_MAX_STORAGE Highest recorded amound of water in the unsaturated and saturated zones combined.
GROUND_LAST_UNSATURATED_STORAGE Amount of water in the unsaturated zone.
GROUND_LAST_UNSATURATED_FRACTION Fraction of total amount of storage available in unsaturated zone which is actually filled with water.
EVAPORATED Total evaporation recorded, including evapotranspiration through vegetation.


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