Soil Transport Parameters

This section describes the parameters in MONICA's SoilTransportParameters JSON object. They control nitrate diffusion and hydrodynamic dispersion through the soil profile.

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List of soil transport parameters

Parameter Name	Type	Unit	Description	Example
AD	Float		Empirical factor \(a\) used to calculate the moisture-dependent molecular diffusion coefficient according to Kersebaum (1989)	"AD": 0.002
DiffusionCoefficientStandard	Float	m2 d-1	Base diffusion coefficient \(D_0\) used in the moisture-dependent diffusion calculation	"DiffusionCoefficientStandard": 0.000214
DispersionLength	Float	m	Longitudinal dispersivity used to calculate hydrodynamic dispersion from pore-water velocity	"DispersionLength": 0.049
NDeposition	Float	kg N ha-1 yr-1	Annual atmospheric nitrogen deposition added to the soil surface. NDeposition is currently taken from SiteParameters and not from the soil transport parameter.	"NDeposition": 0
type	String		Declares that this JSON defines soil transport parameters	"type": "UserSoilTransportParameters"

Note

These parameters are set globally for the entire soil profile.

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Example: soiltransport.json

{
    "AD": 0.002,
    "DiffusionCoefficientStandard": 0.000214,
    "DispersionLength": 0.049,
    "NDeposition": 0,
    "type": "UserSoilTransportParameters"
}