One of the advanced features of Time Series elements is the ability to specify multiple sets of time series data within a single Time Series element, and then specify which series is to be used for any particular simulation. This provides a way, for example, for different time series data to be used for each separate realization in a Monte Carlo simulation.
If you check Enable Multiple Series, there are two changes to the dialogs:
- The Active Series field becomes available, and defaults to “Realization” (this will be discussed further below); and
- The time series editing dialog accessed via the Edit Data button is modified to support specifying multiple series.
This expanded editing dialog (with two additional series added in this case) looks like this:
Three different examples of using multiple time series with a Time Series element are presented below.
Replay of Another Model with Multiple Realizations
When you have a subsystem independent from any other parts of the model, you may consider separating it into another model and importing the results as a time series element. For example, a precipitation rate has to be often simulated as a part of a model in simulations for reservoirs and other water resource models. You may model precipitation rate itself separately in another model and import its result as time series.
Results from Markov Rainfall model imported as multiple series. 100 realizations were run in a different model to generate 100 rainfall records, which were recorded in a Time Series. The recording Time Series was then pasted into this model (and changed to "Locally defined data").
Comparing Time History Outcomes
If you are making a model with different scenarios, you can create a Data element for scenario number. If you want to have different time series for different scenarios, you can specify active series by the scenario number.
The benefit of using multiple series this way, is that you can expose the series number to a dashboard control so the end user of the model can decide which time series to use.
Assigning a Probability to Multiple Series
If you have different time series records with each specified by probability of occurrence, you may represent this by sampling which time series to use.