EFDC Restart Options are shown in 240222401Figure 1. An explanation of the terms used, as well as how to use each option, is provided below in detail.
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Figure 1. Model Restart Options
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EFDC Restart Options (Output) checkbox provides options for the creation of restart files. If the Use option has been selected then EFDC will create a RESTART.OUT file automatically. If Date Stamp is not checked then one file called RESTART.OUT will be created at the user-defined Output Frequency, overwriting the previous file each time. If Date Stamp is checked then a file called RESTART_YYYYMMDD_HH.MM.OUT is created at the Output Frequency for each EFDC sub-module being utilized.
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In order to restart the model, the user can use Set files button to navigate to the folder where the output files are located. The user has to select only the RESTART.OUT file and click open, then the other restart files (such as , RSTWD.OUT, etc.) will be automatically selected by EE based on the requirement of the EFDC model. These files will normally be in the #output folder, with the file name to be selected shown in the header and bottom left of the open file interface. EE will rename the files automatically and save them to the project directory after each one has been selected.
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A new option is Continuation, whereby when restarting a model, EFDC+ can now move to the correct location in the EE linkage files and begin writing from the time the model stopped or from the time selected for restart in case of using date stamp. The settings for this restart option are shown in 240222401Figure 1.
A Continuation Run is the same as the Restart option except that the output will append to an existing run and so is only applicable when there is already model output in the current model directory. If there is no output and a restart file then this option is not enabled. If no date stamp is used EE will display only one restart file without a date label which is the last restart file before EFDC terminated. To create the restart file the Restart Output should be set to continuous (i.e. N=1). EE displays the date range available for the continuation from the most recent binary file output in the Last Dates box.
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- Before running the model ensure EFDC Restart Options (Output) is set/checked to Use. If Date Stamp is selected the user may continue from any snapshot as all snapshots saved, not just the final snapshot. However, this is more memory intensive.
- Reload the model to update Last Date box.
- Select the Continuation radial button (this is not enabled if the model is not reloaded).
- Do not change the time of the start. Save the model in the same folder. If the user wants to save in another folder then they will need to manually copy the output to the new folder.
- Run the model and select overwrite.
The model will run from the continuation time and automatically merge with the prior output. This removes the necessity of the user having to merge runs as was required in earlier versions of EE. This option is different to the Append feature as it is now possible to restart a model at various user-defined times.
Note: Whenever a new cold start is run the user should save the model in a new folder. This will prevent restart files from prior runs being available, in which case the Last Date may correspond to that prior run.
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