Initial conditions for all modules included in the simulation may be obtained from a state file. A state file is an output from a previous simulation, which may store results from multiple modules (Hydrodynamic, Advection-Dispersion, etc.), for a given time step.
The state file has the highest priority amongst the various types of initial conditions definitions. So, when a state file is used, all calculation points described by the state file will use the available values from this file, even if a hotstart file or a user-defined local value is defined. If no state file is used, or if the river network has been modified and some calculation points do not exist in the state file, the initial conditions defined in the other menus, respectively for HD, AD, or ST conditions, are used for the relevant points.
To use a state file for initial conditions, tick the Use state file check box at the top of the dialogue.
It is required to provide a path to the folder containing the state files created from a previous simulation, along with a date and time controlling which time step will be used as initial conditions. The appropriate state file from the selected folder, with the date and time the closest to the specified instant, will be selected automatically during the simulation.
Use simulation start time
If Use simulation start time is active, the initial condition will automatically be obtained from the available state file with the date and time the closest to the simulation start date, as specified in the Simulation period page. If inactive, a user-defined date and time is used.
Date and Time
The date and time at which the initial conditions are loaded from the state files, when Use simulation start time is inactive.