Internal Boundary Conditions

If a simulation with MIKE SHE AD includes more than one part of the hydro­logical cycle, the solute fluxes between the different hydrologic components must be kept track of. In principle, the solute fluxes between the components follow the water flow between the components. Multiplying the flow rate with the solute concentration produces a source/sink term for the relevant compo­nents. Table 33.1 lists the solute exchange possibilities between the compo­nents, in particular when one or more component is not included in the flow simulation.

Table 33.1          Internal boundary source/sinks between hydrologic components in MIKE SHE AD

Solutes from:

Primary solute sink:

Alternative solute sink (if primary sink unavailable):

Precipitation Fluxes

 

Overland flow

 

Unsaturated zone or Groundwater

Overland Fluxes

Infiltration

Overland flow

 

 

Unsaturated zone

MIKE Hydro River

 

 

Groundwater

External boundary

(none)

 

Unsaturated Zone Fluxes

Infiltration

Bypass flow

 

Groundwater

 

 

External Boundary

 

Groundwater Fluxes

SZ Drainage

Upward flux to overland

Upward flux to UZ

Baseflow to streams

 

MIKE Hydro River

Overland flow

Unsaturated Zone

MIKE Hydro River

 

Overland flow or External bound­ary

(none)

Overland flow

(none)

MIKE Hydro River

Baseflow to groundwater

 

Groundwater

 

(none)

An sketch of the different internal boundary conditions is shown in Figure 33.1. Each of these exchanges is detailed in the respective sub-sec­tion for each hydrologic component.

AD_components.jpg

 

Figure 33.1        Outline of the different transport possibilities between components and boundaries.