Calibrating the Model and Editing Data

You may need to make adjustments as you test and calibrate your reservoir Simulation model. In the Simulation Module of ResSim, you can access editors that allow you to edit all components of your Reservoir Network, modify Alternatives, and fine-tune Override controls.

Using the ResSim Editor Interface

In the Simulation Module, the ResSim Editor Interface ("Figure: ResSim Editor Interface in Simulation Module") provides access to editors for Reservoirs, Junctions, Reaches, and Diversions, as well as State Variables, Systems Operations, the Alternative Editor and the Overrides Editor. You can also use the ResSim Editor Interface to quickly set Compute Options.

To access the ResSim Editor Interface, right-click on the Active Alternative in the Simulation tree, then select Edit Run ("Figure: ResSim Editor Interface in Simulation Module").

Editing Alternative Lookback, Time Series, Observed, and System Operations Data

To edit references to Time Series and Observed data, you will need to access the individual editors for Reservoirs, Junctions, Reaches, and Diversions. Also, you may want to revise the System Operations storage balance. You can access each of these editors either from the ResSim Editor Interface (as previously shown in ("Figure: ResSim Editor Interface in Simulation Module")or from the Edit menu of the Simulation Module or Reservoir Network Module.

To select different Alternative Operations or to adjust Lookback data or revise the "mapping" of your Time Series and/or Observed data, you will need to access the Alternative Editor ("Alternative Editor"). The Alternative Editor is available from the ResSim Editor Interface or from the Alternative menu of the Simulation Module. For detailed descriptions of the element editors available in ResSim, refer to "Physical Properties of Reservoirs", "Reservoir Operations - The Basics", "Reservoir Operations - The Rules", and "Advanced Features".

Editing Override Values

Once you have computed a Simulation, you may want to disregard (i.e., override) some of the decisions that were made. The Overrides Editor ("Figure: Overrides Editor") allows you to adjust the computed results for each timestep of the Simulation. You can access the Overrides Editor using Overrides in the ResSim Editor Interface (as previously shown in ("Figure: ResSim Editor Interface in Simulation Module"); or, you can select Overrides (for the appropriate Alternative) from the Simulation Menu.

ResSim will use the values you specify for Elevation Target Overrides, Release Overrides, Outlet Capacity factors within the physical limits of the reservoir, and Storage (or Elevation) Overrides. The physical rate-of-change and the amount of water available in the reservoir may preclude ResSim from using your override values.

For the Reservoir shown in the list at the top of the Overrides editor, there are four tabs available for overriding the simulation results: Each tab contains a Date, Time and either "Elevation Target" or "Release" or "Factor" or "Storage." You can use any one of these override capabilities to adjust the simulation results.

Specifying Elevation Target Overrides: Initially, the Target Elevation is based on the elevation values you specified for the reservoir's "guide curve" (Reservoir Editor, Operations tab). This is typically the top of the Conservation pool and is commonly referred to as the "target" or "guide curve". In addition to meeting all of the other rules that you specify for a reservoir, ResSim will try to keep the reservoir pool at the guide curve elevation. Therefore, by specifying Elevation Target values within this editor, you are inherently overriding the reservoir's release decisions.

Specifying Release Overrides: During a Simulation, ResSim determines the reservoir release values based on the rules you specified for the Alternative. However, there may be situations where you do not want the results to reflect the rules for specific timesteps. Therefore, you can enter release values for the pool, the dam, an outlet group, or an individual outlet using the Release overrides tab.

Specifying Capacity Factor Overrides: The maximum release capacity of an outlet can be increased or reduced by using a factor for the time periods desired. For example, if you want to indicate that an outlet is "out-of-service" for a specific time window within the simulation, you can enter a value of 0 to indicate no release capacity for that outlet.

Specifying Storage (or Elevation) Overrides: A warning is made to the user when selecting this override option because the mass balance computations can be disrupted by forcing the storage or elevation to be specific values.

Editing Override Values
You can specify Overrides by entering single cell values or by revising multiple adjacent values using a fill function.

To revise a single value, double-click in the cell you want to revise and enter the new value.

To revise multiple adjacent values:

• Point and click on the first cell, then drag your mouse or Shift+click (hold down the shift key while clicking in other cells) to highlight the cells to be revised.

• Right-click on the highlighted cells, and select Fill from the context menu ("Figure: Release Overrides Editor Context Menu - Fill Data Values").
  

  Figure: Release Overrides Editor Context Menu - Fill Data Values

  
  

• The Table Fill Options dialog will open ("Figure: Table Fill Options").
  

  Figure: Table Fill Options

  
  
• Select the appropriate fill option in the Table Fill Options dialog ("Figure: Table Fill Options"), then click OK.

The revised values will reflect the fill option you selected. In the example shown in "Figure: Table Fill Options", the Repeat Fill option is selected. Therefore, as the table in "Figure: Release Overrides Editor Table - Revised Data Values using Repeat Fill Option" illustrates, all of the highlighted cells equal the value of the first cell selected; also, the color of the revised values changes from black to blue and the thumbnail plot shows the revised values as a red line. The thumbnail plot can be viewed in full size when you double-click on it.

For those timesteps where you do not specify override values, ResSim uses the reservoir rules to determine the reservoir release values. After running a simulation using your override values, you may decide to no longer use some, or all, of your override values. In that case, you can use Unspecify and Unspecify All to indicate that you want ResSim to determine the release values.

Use Unspecify when you want release values to be based on the reservoir rules for some of the override values you have specified (override values are in green text after a simulation is computed). Highlight the cells where you have specified override values, then press Unspecify.

Use Unspecify All when you want all of the release values to be based on the reservoir rules and not have any overrides specified.

Use Import when you want to use a time series of override values. The Import Overrides Time Series dialog ("Figure: Import Overrides Time Series") will open, which functions exactly like the Select Time Series Path dialog used to select time-series records for an Alternative. Refer to "Time-Series Tab" for more information.