Source allows the user to create the catchment model though Geographic Wizard conveniently. However, before Source version 4.10.0 - Beta Release (August 2019), the user cannot change the created sub-catchment boundary such as merging sub-catchment catchments after Geographic Wizard creates the scenario. The new function was developed to merging merge sub-catchments and reset relevant model elements (such as network/link) and attributes (such as rainfall runoff model parameters) in an existing catchment catchment model. The developed function has been included in the Source software tool after since the version 4.10.0 – Beta Release.
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First of all, the user needs a Source project with any a geographic scenario and open the project.
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- Click on a single node from the interface to select this node, such as the confluence orange cycled on Figure 1 ( i.e Node on catchment SC#10 in this example).
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- To Primary catchment: The property of this sub-catchment will be retained for the combined catchment such as the parameters of rainfall runoff and other models. In this example, the primary catchment is SC#13. This The selected node is the single outlet of the combined catchment.
- Absorbing Catchments: Sub-catchment listed under Catchment (i.e. SC #21, SC #12, SC #20 in this example) will be merged with SC #13 and their properties will be discarded.
- Assign primary: This button allows the user to change the primary catchment if the user wants to use the property from another sub-catchment for the combined catchment. The user can click on any sub-catchments listed under Catchment, then click on Assign primary. The selected sub-catchment (SC #12 in this example) will be displayed into Primary catchment, and the previous primary catchment will be moved to the absorbing catchments.
- Network Restructure:
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Absorb upstream boundary nodes- This function allows to remove all nodes in absorb catchments and it is enabled only when Collapse to primary catchment is ticked.
- Clear groups to re-configure boundaries button will clean the found sub-catchments and reset the interface as Figure 2.
- Combine button will close Combine Catchments Interface; combine the catchments upstream of the selected node, and reset the network and nodes accordingly.
- Cancel button will close Combine Catchments Interface without any combination action.
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- The associated properties are changed correspondingly For example, the new rainfall and runoff table (Figure 8) shows the sub-catchments #12, #SC 20 and #21 was removed, and the combined catchment inherited the property from SC# 13, the primary catchment, such as ID, parameters.
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