The PfsEditor is located in the MIKEZero\bin directory.Ģ 2 Figure 1 Editing the OPTION_PARAMETER section of the HYDRODYNAMIC_MODULE in a MIKE 21 setup using the PfsEditor Information for transferring MIKE grids into and out-of GIS applications.
Wordpad or Notepad) or using the PfsEditor which is part of your MIKE 21 installation (c.f. To enable double precision in your model computation you should add the following line to the hydrodynamic option section in the *.M21 pfs file (look for the section within the section, Include_DB_computations = true The pfs file you can be adjusted by either opening the *.M21 file using a text editor (e.g. The mean relative altitude of the model domain can be lowered simply by using the GridEditor tool. You may increase the relative accuracy of results by either lowering the relative model domain altitude by subtracting the mean altitude value or use the double precision option in the MIKE 21 computations. MIKE 21 does however provide the flexibility to improve the model accuracy in two ways. Often results of this accuracy will not be acceptable for floodplain applications.
For example, a model domain at an altitude of 1000m above mean sea level in standard MIKE21 will produce water depths with an accuracy of ☐.1m. Model domains at high altitudes may produce model results with an order of accuracy insufficient to describe the flow behaviour in the study area. The standard MIKE 21 solution uses single precision with a rounding error on the 6 th digit of the single precision representation. If the bathymetry is located significantly above mean sea level rounding errors may become an issue. When importing GIS surface data for a MIKE21 bathymetry, always ensure that the 'True Land' value is set to a sufficiently large value as these nodes never become active computational nodes within the model domain. GIS surface data may be imported using the GIS-tool 'Grd2Mike' in the MIKEZero Toolbox. Bathymetry Often the bathymetry (or DEM) is available in GIS.
The second most important set of parameters are the forcing specifications (boundaries, rainfall, evaporation, etc.) followed finally by the traditional calibration parameters like eddy viscosity and bed friction. For all MIKE 21 applications the most important input parameter is the bathymetry (or DEM or topography). Guidelines in the document are especially relevant to floodplain and storm surge applications. 1 1 MIKE 21 FLOW MODEL HINTS AND RECOMMENDATIONS IN APPLICATIONS WITH SIGNIFICANT FLOODING AND DRYING This note is intended as a general guideline to setting up a standard MIKE 21 model for applications with significant flooding and drying.
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