Download MIKE SHE USER MANUAL VOLUME 1: USER GUIDE

Coupling of MIKE SHE and MIKE 11
Figure 7.11
A typical simplified MIKE SHE river link cross-section compared to
the equivalent MIKE 11 cross-section.
If the MIKE 11 cross-section is wider than the MIKE SHE cell size, then
the river-link cross-section is reduced to the cell width.This is a very
important limitation, as it embodies the assumption that the river is narrower than the MIKE SHE cell width. If your river is wider than a cell
width, and you want to simulate water on the flood plain, then you will
need to use either the Flooding from MIKE 11 to MIKE SHE using Flood
Codes (V.1 p. 214) option or the Direct Overbank Spilling to and from
MIKE 11 (V.1 p. 216) option.
If you don’t want to simulate flooding, then the reduction of the river link
width to the cell width will not likely cause a problem, as MIKE SHE
assumes that the primary exchange between the river and the aquifer takes
place through the river banks. For more detail on the river aquifer
exchange see Groundwater Exchange with MIKE 11 (V.1 p. 207).
For more detail on flooding and overland exchange with MIKE 11 see
Overland Flow Exchange with MIKE 11 (V.1 p. 212)
7.6.3
Connecting MIKE 11 Water Levels and Flows to MIKE SHE
In MIKE 11, every node in the river network requires information on the
river hydraulics, such as cross-section and roughness factors. These nodes
are known as H-points, and MIKE 11 calculates the water level at every
H-point (node) in the river network. Halfway between each H-point is a
Surface Water
203