Initial Conditions 1D

The Initial Conditions 1D object is used to assign initial hydraulic values to nodes and river reaches at the start of a simulation.

To use an initial conditions object in a simulation, include it in the Schedule Hydraulic Run View when scheduling a run. Values provided in the Initial Conditions 1D object will override values provided by an initial state simulation.

Initial values are defined using the Initial Conditions 1D editor.

Initial Conditions 1D editor

To open an Initial Conditions 1D editor, either drag the Initial Conditions 1D object from the Master Database Window onto the main window background, double click on the object, or right click on the object and choose Open from the popup menu.

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The editor consists of two grid views:

In the River Reaches grid click on the button in the State column to display the State editor. Use the State editor to specify Distance from upstream node, initial Depth and Initial Flow values along the river reach.

For water quality simulations, active mass and deposited mass of sediment values may also be specified. The masses represent the total mass of sediment between the specified distance and the next entry in the table. Bed offset values are used for reaches that use the uniform bed updating method. (Bed offset will always be set to zero for reaches that use the invert bed updating method.)

Note

Values in the State editor must be specified in ascending order by Distance. The initial conditions object will be validated when running a simulation to check that Distance values are in the correct order.

Values can be ordered by right clicking on the Distance column and selecting Sort Ascending from the context menu.

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Importing 1D initial conditions

Initial conditions data can be imported from csv file format or from simulation state data.

Note

If data is imported while the Initial Conditions 1D editor 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.

Exporting 1D initial conditions

To export initial condition data to csv format:

  1. Right click on the Initial Conditions 1D database item in the tree view and select Export | To CSV from the context menu. A standard Windows Save As dialog will be displayed.
  2. 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 1D object.

Database Items