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Two approaches are provided for routing constituent movement through a reach. The first approach assumes the constituent is fully mixed within a reach. This approach can be appropriate where the user is interested in monthly or annual loads. A particle tracking method that is also provided routes the constituent at the velocity of flow (Close, 1996). This method is more accurate and is suitable where the user is interested in concentrations or loads at smaller scales. More information on these methods is available via Constituent Routing Type - SRG.
A number of options are available for representing water quality modification processes in links and storages:
- There are two general models that can act on each constituent, in a manner similar to the processing of each constituent by filter models. These comprise a decay model (see Decay Constituent Processing Models SRG) and, in links only, modelling of surface water-groundwater exchange fluxes (see Flux SRG).
- Simple storage nutrient and sediment deposition models have also been provided. More information on these models is available via Decay Constituent Processing Models SRG.
The above material has been sourced from Welsh, Welsh et al. (2013) with adaptations to suit the needs of the SRG.
References
Welsh, W.D., Vaze, J., Dutta, D., Rassam, D., Rahman, J.M., Jolly, I.D., Wallbrink, P., Podger, G.M., Bethune, M., Hardy, M.J., Teng, J., Lerat, J. (2013) An integrated modelling framework for regulated river systems. Environmental Modelling & Software, 39: 81-102.
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