1Mnr [mass unit*/m³]

AMnr [mass unit*/m³]

KMnr [mass unit*/m³] (Inflow concentration: c_nrⁱⁿ)

QMnr [mass unit*/s] (Mass inflow/outflow: q_{c, nr}) (only transport models with the XTRA module)

For the calculation of transport processes with multiple components in SPRING with the XTRA module, additional model data is available for the definition of source terms, boundary- and initial conditions.

The substance number nr must be defined in the model files using two digits (01, 02, 03, ... to 99), so that the respective identifier consists of a total of 4 characters (for example 1M05). The attributes are analogous to the attributes for the transport calculations of only one substance:

1Mnr = 1KON,

AMnr = AKON,

QMnr = QKON, and

KMnr = KONZ.

The zone numbers Z-KD must be integers and positive. Elements that are not assigned a Z-KD value are automatically assigned a zone number of zero

*: The mass units in which the concentrations for the substance nr are specified are defined in the initialisation file xtra.ini!