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Overview
In Source, the term constituents refers to materials that are generated, transported and transformed within a catchment and affect water quality. Common examples include sediments, nutrients, salts and other dissolved solids.
Processes that act on these constituents to generate, transport and transform them can be modelled in Source. These models are categorised as:
- Constituent generation models (only for catchment scenarios) - describe how constituents are generated in the functional unit and the resulting concentrations or loads delivered to the sub-catchment node;
- Constituent filtering models (only for catchment scenarios) - represent any transformation of constituents between generation within the FU and arrival at the link upstream of the sub-catchment node.
- Constituent routing (conservative constituents) models - describes the movement of constituents along a river channel network, including exchange of constituent fluxes between floodplains, wetlands, irrigation areas and groundwater;
- Constituent processing models
Constituent Generation Models
Constituent Filtering Models
Constituent Routing Models
Constituent Processing Models
Water quality processes are modelled in links and for node types which have storage associated with them (see Nodes - SRG). Most node types have no storage and at these the mass balance of each water quality constituent being modelled is maintained with no decay or deposition processes.
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