Advection and Diffusion of Particulates to/from Network Pathways

Suspended solids can advect and diffuse into Network pathways, and can advect out of Network pathways. The advection of suspended solids within pipes in fracture networks is identical to the behavior of suspended solids within Pipe pathways.

Suspended solids can advect into a Network pathway A transport pathway element that provides a computationally efficient way to simulate large, complex networks of one-dimensional conduits in order to describe contaminant transport through fractured rock systems. from other pathways containing suspended solids. Suspended solids can also diffuse into a Network pathway from a Cell or Aquifer containing suspended solids. The species The chemical (or non-chemical, such as bacterial or viral) constituents that are stored and transported through an environmental system in a contaminant transport model. In GoldSim, the Species element defines all of the contaminant species being simulated (and their properties). mass associated with the suspended solids in the upstream (Outflow or Outflux) pathway enter the Network pathway regardless of whether suspended solids are specified as being present in the pathway. When suspended solids (carrying species mass) enter a Network pathway from another pathway, conceptually, the particulates are assumed to immediately disintegrate upon entering the pathway (releasing their species mass to dissolve in the fluid in the pathway). If suspended solids are present in pipes in the Network pathway, the species mass will then partition onto these solids.

Note: GoldSim uses the advective and diffusive flux of particulates only to transport species mass and does not keep track of the movement of the suspended Solid media Materials (such as water, sand, clay, air) that constitute (are contained within) transport pathways. GoldSim provides two types of elements for defining media: Fluids and Solids. through the pathway network. That is, the flux of particulates has no affect on the quantity of the suspended Solid present in either the Outflux or Influx pathway.