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Constituent modelling at the Weir node has the same options as the Storage node (see Figure 6 and Figure 8 above). The Weir node has a configurable storage routing upstream link and a constituent decay model on this link is configurable through the Constituent Models table.
Scenario Transfer node
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For each constituent, you can specify an increase in concentration from different sources, similar to constituents in the storage node (Figure 10). The parameters are:
- Additional Inflow Load – specify the amount of constituent mass to be added to the storage routing link per time-step. It is not specific where this constituent mass comes from.
- Groundwater – concentration of the constituent entering the link via groundwater flow
- Timeseries Flux – concentration of the constituent entering the storage routing link via a Timeseries Flux.
Note that both Groundwater and Timeseries Flux need to be configured on the storage routing link for constituents to enter the link using these sources - see Groundwater and Storage routing - Timeseries Flux.
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| Note: Unless there is either an initial storage or initial flow defined, there will be no constituent mass in the link at the start of the model simulation. |
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The models available for simulating constituents at Functional Unit and sub-catchment level are accessed through the Constituents Models table. These include constituent generation models and constituent filter models, configurable for each sub-catchment/functional unit (FU) combination. by navigating to Edit » Constituent Models... (Figure 12). You can configure more than one generation and/or filter model for a sub-catchment/FU combination by using constituent sources.
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Figure 14. Accessing the Constituent Filter models
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The Constituent Models table provides a central location from which all constituent models which have been assigned to catchments, nodes or links in a model can be accessed (Figure 15). This is a quick way to assign or modify constituent models. The Import/Export buttons allow the user to Export the current configuration of constituent models, apply bulk modifications, and then Import the table, provided column headings and the number of rows does not change. The Export/Import file format is .csv.
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