Introduction to 2D WQ Precipitation and Evaporation

Water quality associated with precipitation inputs and evaporation conditions may be modelled in MIKE+ 2D Overland.

If the model setup includes precipitation and/or evaporation boundaries, specify the concentration of each component in the precipitation and evaporation water mass.

These options are available in MIKE+ if the 2D Overland modules 'Hydrodynamic (HD)' and 'Water quality (AD)' are active AND 2D Precipitation/Evaporation boundaries are included in the model setup.

Precipitation and evaporation water quality conditions can be included as:

• Ambient concentration. The concentration of the precipitated/evaporated water mass is set equal to the concentration of the ambient water in the domain.
• The concentration of the precipitated/evaporated water mass may be specified explicitly as:
  • Uniform
  • Varying in time
  • Varying in domain
  • Varying in domain and time.

Configure these WQ characteristics individually for each WQ component defined in the setup.

Use the 2D WQ Precipitation editor to configure water quality properties for Precipitation boundaries in the model.

Use the 2D WQ Evaporation editor to configure water quality properties for Evaporation boundaries in the model.

Note

If the 2D Precipitation boundary is modelled as ‘Net precipitation’ (see 2D Precipitation and Evaporation) the precipitation concentration will be used when the net precipitation is positive. When the net precipitation is negative, the evaporation concentration is used.

More details on data requirements for each of the above-mentioned 2D WQ Precipitation/Evaporation boundary types are presented in following sections.