The Nil Constituent model is used as a substitute constituent generation model where no constituent load needs to be modelled for a given constituent from a given functional unit (FU).Observed Concentration model is used when observed quick flow and slow flow concentrations are available.
Scale
The Nil Constituent observed concentration model operates at the functional unit scale at the time-step of the main model.
Principal developer
eWater CRCN/A??
Scientific Provenance
The Nil Constituent model is typically applied to functional units that generate only minimal amounts of some constituent, or in cases where the constituent load is accounted in some other process, such as being directly applied at a node in the stream network. One example is modelling point sources of nutrients in a model that also includes sediment. In this case, the point source can include a Nil Constituent model for sediment.
Version
Source v2.10Observed Concentration model is used when observed data is available. One example is ....?
Version
Source v3.8.19
Dependencies
Applies to catchment models built in Source.
Availability/conditions
Nil Constituent Observed Concentration is automatically installed with Source.
Flow phase
This model sets the constituent load at a time-step to 0.the data input for that time step.??
Input data
This model has no input data or parameters. In choosing to apply the Nil Constituent model, the modeller is assumed to have a basis to believe that the given functional unit is not a source of the constituent in question??Time series or constant for each functional unit with units of ???.
Output data
This model sets the constituent output of the target functional unit and, through this, influences the constituent output of the sub-catchment and the downstream node. These influences can be seen by recording constituent output at the functional unit, the surrounding catchment or any point downstream.