The bottom frame of Figure 1 2347678 shows the EFDC Restart Option. An explanation of some of terms is provided below, as well how to use each option.
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From release of EE7.2 a number of updates have been provided for restart options. 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 Figure 1 2347678.
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 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 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 snap shot as all snapshots saved, not just the final snapshot. However, this is more memory intensive.
- Reload the model to update Last Date box. In this case (Figure 22347678) the model stopped at T = 142.75.
- Select the Continuation radial button (this is not enabled if the model is not reloaded).
- Do not change the time of 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.
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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.
Other options not discussed above include: Warm Start. This function that allows the user to create the initial conditions for the model at a specified time. This is useful for diagnostic and sensitivity analyses, allowing the user to understand key processes in the system. A Warm Start may be created using either the ViewPlan or View3D. The user goes to the desired time and saves the current model conditions by selecting the highlighted button, shown in Figure 3 2347678 below. In this case, the new Warm Start model would begin with the water column and sediment bed conditions at 271.042. A Warm Start model is different from a Hot Start model because the momentum is not included. Therefore model would begin from a quiescent system as all velocity values are zero.
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