Initial Conditions 2D
The Initial Conditions 2D object is used to assign initial hydraulic, infiltration and water quality values to 2D Mesh elements at the start of a 2D Simulation.
Initial values are defined for 2D Zones and 2D IC Zones using the Initial Conditions 2D Grid Window. These values are then applied to the 2D mesh elements falling within the zone polygons.
Initial values set for 2D IC Zones override initial values at 2D Zones.
Initial conditions can be imported from CSV files into new or existing Initial Conditions 2D objects, and can also be exported from an existing Initial Conditions 2D object to a CSV file.
Initial Conditions 2D Grid Window
To open an Initial Conditions 2D Grid Window for editing, either drag the Initial Conditions 2D object from the Master Database Window onto the main window background, or right click on the item and choose Open from the popup menu.
| Field | Description |
|---|---|
|
Zone ID |
Name of 2D Zone or 2D IC Zone |
|
Zone Type |
Select the type of zone that the initial condition is to be applied to from the dropdown list: |
| Variable |
Select the type of variable to be set from the dropdown list:
|
| Concentration |
Enabled when Variable is set to a water quality determinant type Initial concentration of determinant. |
|
Concentration (Salt) |
Enabled when Variable is set to SALT Initial concentration of salt |
| Temperature |
Enabled when Variable is set to TW_DIS Initial water temperature |
| Quantity |
Enabled when Variable is set to PH_DIS or COLDIS Initial pH or coliform value |
| Horten soil water content |
Enabled when Variable is set to Infiltration Initial soil moisture content for use when using the Horton Infiltration Model. |
| Green-Ampt soil moisture deficit (%) | Enabled when Variable is set to Infiltration The initial soil moisture deficit (i.e. the difference between soil porosity and actual moisture content) in the Green-Ampt Model. The percentage entered must be greater than or equal to zero and less than or equal to 100. If no Green-Ampt soil moisture deficit (%) is specified as an initial condition 2D, then the soil moisture deficit is set to zero, and the ground is assumed to be saturated. |
|
Level Type |
Select an option from the dropdown list:
|
|
Depth |
Enabled when Variable is set to Hydraulic or Bed sediment and Level Type is set to Depth Initial height of water at the centroid of the mesh element relative to ground level when Variable is set to Hydraulic. Initial thickness of sediment layer at the centroid of the mesh element relative to ground level when Variable is set to Bed sediment. |
|
Elevation |
Enabled when Variable is set to Hydraulic or Bed sediment and Level Type is set to Elevation Initial height of water (above datum) at the centroid of the mesh element when Variable is set to Hydraulic. Initial height of bottom level of sediment layer (above datum) at the centroid of the mesh element when Variable is set to Bed sediment. |
|
Speed |
Enabled when Variable is set to Hydraulic Initial velocity of water in mesh element |
|
Direction |
Enabled when Variable is set to Hydraulic Initial direction of flow in mesh element Angle in radians from due East |
| Layer |
Enabled when Variable is set to Bed sediment Layer to which the initial conditions are to be applied:
|
| Layer composition type |
Enabled when Variable is set to Bed sediment The method by which composition of layer is to be entered for each sediment fraction:
|
| Layer concentration sf1 |
Enabled when Variable is set to Bed sediment Percentage of initial mass of sediment fraction 1 if Layer composition type is set to Mass concentration. Percentage of initial volumetric concentration of sediment fraction 1 if Layer composition type is set to Volume concentration. |
| Layer concentration sf2 |
Enabled when Variable is set to Bed sediment Percentage of initial mass of sediment fraction 2 if Layer composition type is set to Mass concentration. Percentage of initial volumetric concentration of sediment fraction 2 if Layer composition type is set to Volume concentration. |
Importing from csv file
To create a new Initial Conditions 2D object by importing data from csv file:
- Right click on the Model Group in the tree view and select Import InfoWorks | Initial conditions 2D | From InfoWorks format CSV file from the context menu. A standard Windows Open dialog will be displayed.
-
Select the file(s) to be imported and click Open.
A new Initial conditions 2D object, with the same name as the imported file, is created and contains the imported data.
To import initial conditions into an existing Initial Conditions 2D object from csv file:
- Right click on the Initial conditions 2D object and select Import | From Infoworks format CSV file from the context menu. A standard Windows Open dialog will be displayed.
-
Select the file(s) to be imported and click Open.
If data is imported while the Initial Conditions 2D grid window is open, the view will not be updated until the grid is re-opened. Any changes made subsequent to the import, before the grid is closed, will overwrite the imported data.
If network objects in the file to be imported already exist in the initial conditions object, a warning message will be displayed allowing a choice of overwriting or cancelling the import for each object type.
The file format consists of a version record followed by one data record for each zone.
Exporting 2D initial conditions
To export initial condition data to csv format:
- Right click on the Initial Conditions 2D database item in the tree view and select Export | To CSV from the context menu. A standard Windows Save As dialog will be displayed.
- Set the path of the file to be saved and click the Save button.
The initial conditions will be exported to a csv file which can be used to import data into another Initial Conditions 2D object.
