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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.
Figure 15. Constituent Models table
Linking constituent generation or filter models
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Note: This functionality is currently under development and not all models can be linked. The description that follows is an illustration of what can be undertaken in Source. |
Constituent generation and filter models may require one or more of their parameters to originate from another generation or filter model. The load-based nutrient delivery ratio (NDR) filter model depends on the input of the load-based sediment delivery ratio (SDR) filter model. To configure constituent model linking between these two models for a given sub-catchment/FU combination and constituent source, assign an SDR model to the sediment constituent, and an NDR model to each other appropriate constituent. You then need to define a linkage between the SDR quickflowConstistuentIn parameter and the quickflowSedimentIn parameters of the NDR models. Once the linkage is created, the SDR model is run before the NDR models, allowing the correct flow of data at the right point in time.
To link an NDR model to an SDR model, in the Constituent Model Configuration dialog (Edit ..):
- From the tree menu, under filter model, select the constituent representing sediment
- For the appropriate sub-catchment/FU combinations:
- assign the load-based sediment delivery ratio model, and
- configure the parameters of the model
- From the tree menu, under filter model, select an appropriate constituent (representing nutrients)
- For the same sub-catchment/FU combinations:
- Assign the load-based nutrient delivery ratio model
- For the parameter quickflowSedimentIn click the ellipsis button (...) next to Not Linked to open the Define Constituent Model Linkage dialog.
- Select the sediment constituent from the list of constituents, the constituent source, the Load-based sediment delivery model), and finally the parameter whose value will be used as input (quickflowConstituentIn).
- Click OK to close the dialog.
- Configure the rest of the parameters of the model.
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Note: Source detects circular dependencies, and will notify you if a defined link needs to be corrected prior to proceeding. |
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Constituent sources allow you to configure more than one constituent generation and/or filter model for a given sub-catchment/FU combination. Each constituent source assigned to a constituent/sub-catchment/FU combination allows you to select different constituent models or model parameters. For each source, the selected generation or filter model and its parameters are applied across the entire area of that sub-catchment/FU. An example use for constituent sources is to model the constituents from a fire in the forest and agriculture functional units of SC #1. First, two sources are defined, Default and Fire (Figure 1). Then the default source is used to model the constituent generation and filtering under natural conditions for both the forest and the agriculture FUs in SC#1. Then the fire source is used to model the additional constituent generation and filtering that results from the fire (Figure 2).
The first step when configuring constituent sources is to add sources to the Constituents Configuration dialog (as described in Defining constituents, Figure 1). There is always at least one constituent source that is the default, it is indicated by a green tick (Figure 1), and cannot be deleted. You can change which source is the default using the Set as Default contextual menu.
For each constituent, every sub-catchment/FU combination is assigned the default constituent source for both constituent generation and constituent filtering. You can change the constituent source from the default or add or remove additional constituent sources in the Constituent Model Configuration dialog (Figure 2), which is opened by navigating to Edit ...
To change a constituent source for a constituent generation or filter model:
- Select the constituent you wish to change the source for (the tree view on the left) under either the filter or generation model (any change to the source is automatically applied to both models for that constituent);
- Select the row with the appropriate sub-catchment/FU combination;
- Right-click and choose Add Constituent Source » Current Constituent » <source name>. This will add a new row to the table, allowing you to assign and parameterise a new constituent generation or filter model for the selected constituent/sub-catchment/FU.
You can also undertake the following actions using the same contextual menu:
- The process to remove a constituent source from an FU is identical to adding one. Choose Remove Constituent Source » Current Constituent » <source name>. Note that at least one constituent source must exist at all times. If all sources have been removed, a new row with the default source will be automatically added;
- Bulk the assignment of a source to multiple constituents can be made using the Add/Remove Constituent Source » All Constituents. This will add that constituent source to that sub-catchment/FU combination for all constituents.
- You can assign the same constituent source to several sub-catchment/FU combination by selecting multiple rows, then right-clicking and choosing the desired constituent source menu item.
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