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 you 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 File>New. Model type should be "Rivers, collection system and overland flows". Unless you have a specific reason to create postGIS database, leave the database type as SQLite (default). Provide the database/project path - see Fig. 1.
Step #03 - Set up Coordinates
Specify the coordinate system of your model. You can manually browse the coordinate system - see Fig. 2 - 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. 2 - Coordinate system definition
Step #04 - 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. 3 - which will import all coupled models such as MIKE21 and MIKE HYDRO River.
Fig. 3 - Predefined Import Functions
Step #05 - 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 #06 - Import Log
An Import log will be created. Check the log view - see Fig. 4 - especially warnings in orange.
Step #07 - 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 Figs. 5-6.
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+ River Guide
MIKE+ Model Manager