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To use this functionality, the user must decide which of these two scenarios (scenario A or scenario B) is the target scenario and which one is the source scenario. It is important to know this because after merging two scenarios all components of the source scenario are transferred to the target scenario to generate a modified target scenario.
Transferred components can include:
- Sub-catchments: boundaries and geo-regions,
- Network elements: nodes and links and their defined configuration,
- Functional unitsUnits: all classes and the areas (source and target scenarios can have different classes of FUs, in this case, the modified target scenario will have FUs’ classes consisting of both scenario classes)
- Data sources and functions (assigned to network elements)
- Rainfall-runoff models: assigned inputs and the model parameters values,
- Constituent generation and filter models: assigned inputs and the model parameters values.
It should be mentioned that after merging two scenarios, the change of the modified target scenario is unable to reverse and return it to its initial set-up
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IMPORTANT POINT: so far, only the transfer process has taken place and these two scenarios have not yet been connected in terms of the links network structure. If this merged scenario needs to be run in a connected manner, the user must create a link between them manually. To do so, the user must decide how to connect these two network structures together. For instance, in Figure 5, we want to connect Gauge 1 to the specified confluence.
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To do this, right-click on the Geographic Editor Window and select the “Add Link” “Add Link” option. Then, along the flow direction, click on the Gauge node and then on the Confluence node, respectively (Figure 6). According to Figure 6, a new link is added to the flow network to connect the network structures upstream and downstream of the gauge. In this way, the source and target scenarios are not only merged but also connected. In the case of running this scenario (for rainfall-runoff modelling or constituent modelling), all sub-catchments and their related stream networks are run-connected.
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Figure 6- Adding a link between two parts of a merged catchment model
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