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Question
I have a model created in MIKE11/MIKE HYDRO River/MIKE21/MIKE FLOOD. How can I convert it to a MIKE+ model?

 

 

Answer
You have to follow the steps below to convert your model into a MIKE+ model:

Step #01 - Model Check
Make sure that the model can be correctly opened in MIKE11/MIKE HYDRO River/MIKE21/MIKE FLOOD.


Step #02 - MIKE+ Model Creation
Create an empty MIKE+ database. Launch MIKE+ and create a new MIKE+ project via File| New.  See Fig. 1.  

 

Fig. 1. - Create a new MIKE+ project via the File menu

 

The New Model Setup dialog appears (Fig. 2). Complete the information on the Model Selection tab with these key items:
  • Model type: Choose ‘Rivers, collection system and overland flows’
  • Unit system
  • Database type: MIKE+ supports two database types: (1) Sqlite and (2) PostGIS. A Sqlite database is the default option, which suits most general uses of MIKE+. A PostGIS database may be located on a server for remote access and supports simultaneous access from multiple users. Unless you have a specific reason to create postGIS database, keep the database type as SQLite.
  • Database setting and project setting: This is where you define the names and locations of the database (e.g. *.sqlite) and project (*.mupp) files to be generated for the new MIKE+ project.
    Note: If you enter just the database file name, the *.mupp file will be named and located similarly
  
Fig. 2. - Model Selection page on the New Model Setup dialog: Defining the file path
 

Step #03 - Set the Coordinate System for the MIKE+ project 
Next, click on the Coordinate System tab from the New Model Setup dialog to define the Coordinate System for the new MIKE+ project and database (Fig. 3). Please note that MIKE+ works with projected (and not geographic) coordinate system types.

You can manually browse the coordinate system or read one from the MIKE HYDRO River or MIKE 21 file you are trying to convert by clicking on the "Select File" button, then, press OK.

 

Fig. 3. - Define the coordinate system for your MIKE+ project

 

We recommend you set the coordinate system for your MIKE+ project before importing full MIKE HYDRO River or MIKE 11 setups. To determine the appropriate Coordinate System:

  • From MIKE HYDRO River: Set the MIKE+ coordinate system as you would in MIKE HYDRO River using the ‘Select file’ button on the Coordinate System tab of the New Model Setup dialog.  See Fig. 4.
     

Fig. 4. - Define the coordinate system for a MIKE+ project from the MIKE HYDRO River model to migrate

 

  • From MIKE 11: Check the Map Projection and Working Area dialog from the Network editor (Fig. 5)
     

Fig. 5. - Map projection information from a MIKE 11 setup to migrate
 
If the setup of the river model you wish to migrate into MIKE+ is set to ‘Local Coordinates’ or ‘Unknown’, you may keep the ‘Local Coordinates’ setting in MIKE+. However, this may prevent the use of publicly available background map layers as overlay information for the model in MIKE+.

 

Step #04 - Finalize the creation of the new MIKE+ project
Click OK on the New Model Setup dialog to create the new MIKE+ project. Two files will then be created:
  • Database file: Will be an SQLite (*.sqlite) or a Postgres database. This essential file stores actual model data. In MIKE+, any changes to model data are autosaved in real time – i.e., a change to a parameter is instantaneously reflected in the database
  • Project file: The *.mupp project file stores supplemental information such as GUI window layouts, map symbology, additional layers added to the map, etc.. To save changes related to this project information, use the ‘Save’ button in MIKE+.  See Fig. 6.

 

Fig. 6. - Click on ‘OK’ to create your new MIKE+ project

 

Prior to importing full MIKE HYDRO River or MIKE 11 setups, you may also modify the Coordinate System settings for the newly created project in MIKE+ via the Coordinate System editor.  See Fig. 7.
 
Fig. 7. - The coordinate system may be set or modified after the MIKE+ project has been created

 

Step #05 - Import Models
Once an empty database is created, go to File>Import and import your model.  For MIKE FLOOD, it is recommended to use "Import full MIKE FLOOD model setup" option - see Fig. 8 - which will import all coupled models such as MIKE21 and MIKE HYDRO River.

 

Fig. 8. - Predefined Import Functions

 

Step #06 - Warnings Checks
A warning "Import operation will overwrite the database, do you want to continue?" pops up. Press "Yes".

Depending on settings of your model, more warnings may pop up to warn that not all functionalities of the old model are incorporated to MIKE+.  Note that the latest version of MIKE+ has almost all functionalities as MIKE11/MIKE HYDRO River/MIKE21/MIKE FLOOD (except for a few which were not widely used and decided to decommission or were taken over by a new functionality of MIKE+).

 

Step #07 - Import Log
An Import log will be created. Check the log view - see Fig. 9 - especially warnings in orange.

 
Fig. 9. - Log view with the Import-related messages
 

Step #08 - Cross Check Validation 
Cross-check with the original model. Finally, after importing the model into MIKE+ a cross-check validation is recommended to make sure that all components are present in the new model - see Fig. 10-11. 

 
Fig. 10. - Example of three-way model setup as shown in MIKE ZERO (MIKE FLOOD)
 
Fig. 11. - Example of a three-way model as shown after importing in MIKE+ integrated model
 


NOTES:

  • Extra caution must be taken when converting a MIKE 21 Classic/Single Grid model (or a MIKE FLOOD model with MIKE21 Classic/Single Grid) because:

    • The 2D Overland module of MIKE+ is based on the MIKE 21 FM engine (applying the Finite Volume method), which is a significantly different numerical method from the one used by the MIKE 21 Classic/Single Grid model engine (Finite Difference method).

    • 1D-2D couplings and boundary conditions are imposed at the elements' faces rather than at the elements' centers.

    • Some differences in results are expected and you may need to adjust definitions of couplings and boundary conditions or recalibrate the model.

  • Model setups from decommissioned products should ideally be upgraded to the latest version of this product.

    • For MIKE 11, MIKE HYDRO River and MIKE FLOOD, that is Release 2023.

    • For MIKE URBAN, that is Release 2020 Update 1 (hotfixes made for that release are not necessary).

    • There is a special case where there is a MIKE FLOOD setup that includes MIKE URBAN coupling. In that case, it is recommended that users update the setups to Release 2020 Update 1 for the MIKE URBAN database, and to Release 2023 for the MIKE Zero model setups.
      MIKE URBAN 2020 Update 1 can be downloaded from here (click on “Published On” column to sort from older to newer): https://support.dhigroup.com/download/?Category=Installation%20File

  • It is recommended to run any 1D simulation with MIKE1D engine in the original setup (MIKE HYDRO River / MIKE 11 / MIKE URBAN and MIKE FLOOD) prior importing into MIKE+. This is because this step may report issues about invalid input data due to different requirements in the old engines and in MIKE 1D engine. In this context it is recommended and better to have these issues fixed before the import.

 

FURTHER INFORMATION & USEFUL LINKS

Manuals and User Guides
MIKE+ Documentation Index
MIKE+ River Network Modelling User Guide
MIKE+ Model Manager

 

 
 
Keywords: MIKE+, conversion, import, MIKE 11, MIKE HYDRO River, MIKE 21, MIKE FLOOD
Related Products: MIKE 11, MIKE 21/3, MIKE FLOOD, MIKE HYDRO River, MIKE+

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