Rivers and Lakes

In this dialogue, you can link MIKE SHE to a MIKE 11 or MIKE Hydro River simulation. The text box will accept a MIKE 11 setup (.sim11) file or the newer MIKE Hydro River setup (.hydro) file.

In principle, there are three basic steps for developing an integrated MIKE SHE/MIKE Hydro River model:

1. Establish a MIKE Hydro River hydraulic model as a stand-alone model, make a performance test and, if possible, a rough calibration using prescribed inflow and stage boundaries.

2. Establish a MIKE SHE model that includes the overland flow component and (optionally) the saturated zone and unsaturated zone components.

3. Couple MIKE SHE and MIKE Hydro River by defining branches (reaches) where MIKE Hydro should interact with MIKE SHE.

The chapter Coupling of MIKE SHE and MIKE Hydro River (V1 p. 523) describes in more detail the three steps above.

Flooding and Inundation

Flow on the flood plain can be simulated by overbank spilling. However, this can be numerically intensive.

In many cases, you do not need to calculate the actual flow but only the water levels on the ground surface, for example in wetland areas on the flood plain. For such cases, you can use Flood Codes to define the inundated areas. See Flooding from MIKE Hydro River to MIKE SHE using Flood Codes (V1 p. 537).

Flood codes - With this option, you can specify the Flood Code map that shows which cells flood during a storm event, or are otherwise covered with water (e.g. permanent wetlands).

Bathymetry - The bathymetry is used to more accurately simulate the topography of the flood code cells, when the MIKE SHE topography is specified on a larger grid.

Water Quality with MIKE 11

Finally, if you have selected Water Quality calculation for Rivers and Lakes in the Water Quality Simulation Specification (V1 p. 202) dialog, then an extra .sim11 specification will be displayed. In this text box, you must specify the .sim11 file that contains the water quality model for MIKE 11. This may or may not be the same as the one specified for the water movement calculation.

The extra .sim11 specification is required because the water quality model is run independently of the water movement model. In other words, the water movement model is run first, which calculates the exchange between the groundwater and surface flow, with the MIKE 11 river model. Then the water quality model uses the water movement results to calculate the solute fluxes between the different water components. Thus, the water quality .sim11 file could be different than the water movement .sim11 file if you are running several solute transport scenarios. However, the .sim11 files must be consistent. This consistancy will be checked at run time.

The MIKE 11 water movement results cannot be recycled in the same way that the rest of the MIKE SHE results can be. Your MIKE 11 simulation must cover the entire period of you water quality simulation.