Solute transport model

Solute transport is implemented with StorAge selection (SAS) functions:

\[C_Q=\int_{T=0}^{\infty} C_S(T,t) \cdot \alpha_p \cdot \overleftarrow{p}_{Q}(T,t) dT\]

where \(C_{Q}\) is the solute concentration of the considered flux at time step \(t\) (mg \(l^{-1}\) or ‰), \(C_{S}\) is the solute concentration of the considered StorAge at time step \(t\) (mg \(l^{-1}\) or ‰), \(\alpha_{p}\) is the partition coeffcient (-), \(P_{Q}\) is the travel time distribution of the considered flux at time step \(t\) (-) and \(T\) is the water age (days).

Currently, Roger can be used to simulate with the following solutes: - stable water isotopes - bromide - chloride - nitrate

• StorAge selection (SAS) functions
  • Uniform
  • Power
  • Kumaraswamy
  • Exponential
  • Dirac
  • Gamma
  • Exponential
  • Time-variant SAS function parameters
  • Short description of SAS parameterization
• Biogeochemical processes
  • Soil temperature
  • Nitrogen mass balance
  • Denitrification
  • Nitrification
  • Nitrogen mineralization
  • Nitrogen uptake by crops
• Model structures
  • Complete-mixing
  • Piston
  • Advection-Dispersion
  • Preferential