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Figure 3- Merge Catchments Window
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By activating the target scenario from the Project Hierarchy, the changes made to this scenario will be noticeable (Figure 4). Also, in the Project Hierarchy section, the transferred nodes, links, and sub-catchments are shown with the selected prefix (in this example “copied”).Important point
Figure 4- Target scenario after the merging process
IMPORTANT POINT: so far, only the transfer process has taken place and these two scenarios have not yet been connected in terms of the 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.
Figure 5- Connecting the links network of the merged scenario
To do this, right-click on the Geographic Editor Window and select the “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.
Figure 6- Adding a link between two parts of a merged catchment model
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