External Pathway Outputs

External pathways have two types of outputs:

• User-defined output arguments; and
• Mass flux link An interconnnection between two transport pathways that defines the rate at which species move between the pathways. Outflows.

The user-defined outputs are optional (none need be defined). Their type and dimension are determined by the user when they are created.

For every advective mass flux link A mass flux link in which a quantity of a medium is specified to flow from one pathway to another, carrying dissolved, sorbed, and/or suspended species with it. in which the External pathway A transport pathway element that provides a mechanism by which external program modules for contaminant transport (e.g., analytical, finite elelement, or finite difference models) can be directly integrated into GoldSim. is the Outflow (upstream) pathway, an output is created on the External pathway:

• Medium_to_Path2, where Medium is the name of the flowing medium (which is always the Reference Fluid A special type of Fluid element that provides a basis for defining partition coefficients between media for the various species in the model (i.e., the ratio of the species’ concentration in the medium to its concentration in the Reference Fluid at equilibrium).), and Path2 is the name of the linked (Inflow) pathway. This is a vector A one-dimensional array. by 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)., and has dimensions An output attribute for an element that defines the dimensionality (in terms of Length, Time and other fundamental dimensions) of the output. of mass/time. It represents the mass flux of each species from the External pathway to the downstream pathway.

It is important to understand that the mass flux outputs from an External Pathway represent the mass rate over the previoustimestep A discrete interval of time used in dynamic simulations.. This can have implications if you choose to integrate one of these outputs (using an Integrator).