Read this article when you have a SOBEK 2 model and you want to convert it to SOBEK 3. If you want to import a DUFLOW model, see reference Jeuken (2014).
Preface
SOBEK 3 is refaced against SOBEK 2 in terms of modeling concept and features. This means that some features in SOBEK 2 are no longer supported and some objects are modelled in a different way.
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SOBEK 2 | SOBEK 3 |
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Hydraulic structures in channel flow module and rainfall runoff module | Hydraulic structures in D-Flow 1d 1D module only |
Control of structures in channel flow module and RTC module | All control of structures in D-Real-Time Control module (D-RTC module) |
Rainfall-runoff module contains open water node | D-Rainfall Runoff (D-RR) has no open water node, RR it contains only rainfall-runoff processes. |
Rational method in channel flow module (lateral station node) and rainfall-runoff module | No rational method in D-Flow 1d1D. The rational method is only available in D-RRRainfall Runoff |
Storage and lateral node available in channel flow module | D-Flow 1D does not contain a storage and lateral node (planned feature) |
Approach
Import the SOBEK 2 model into SOBEK 3 and choose features
Procedure:
- Start with the SOBEK 2 channel flow module.
- Modify the SOBEK 2 model in such a way that the corresponding SOBEK 3 model
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- produces the same results, or that all differences in results can be explained.
- Finalize the 1D flow model by manual modifications.
- Continue with the rainfall-runoff module.
- Continue with the water quality module.
Finalize the model by manual modifications.
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1D flow
Clean up the SOBEK 2 model
First clean up the SOBEK 2 model with the Cleanup Utility:
Import to SOBEK 3
Now create a SOBEK 2 model that can be imported in such a way that there is no difference between the SOBEK 2 model and the SOBEK 3 model with regards to the contents.
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- Import your SOBEK 2 model with the help of the import feature in SOBEK 3.
- Check the import log messages. Are there any features that are not supported, any values that are modified by the import tool?
- Modify your SOBEK 2 model accordingly: delete features that are not supported in SOBEK 3.
- Repeat the three steps above until there are no model differences between the SOBEK 3 model and the SOBEK 2 model.
To import the model, use the SOBEK 3 import tool:
SOBEK 3 import window. Choose "SOBEK Model (Flow 1D, RTC, RR, WAQ)". This window is accessible via File --> Import
Select case after opening CASELIST.CMT
Dependent from the choices you make, you receive an integrated model with the following sub-models:
- water flow 1d
- real-time control
The following list gives examples for modifications that might be necessary:
- The rational method on lateral inflow is not supported, lateral inflow must be accounted for in a different way, for example with a set of time series.
- Infeasible bottom levels for culverts must be changed.
- Open water nodes are not imported into D-Flow 1d1D. They must be deleted in the SOBEK 2 model.
- Structures in the rainfall-runoff module must be deleted.
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- The initial value 0 of PID controller <id> will not be used. The defined structure dimension is the initial value:
- In SOBEK 3 you can’t define an initial value of the PID therefor , therefore the initial structure setting are used as initial value.
- The initial value -5.37 of PID controller <id> will not be used. The defined structure dimension is the initial value
- In SOBEK 3 you can’t define an initial value of the PID therefor , therefore the initial structure setting are used as initial value.
- Case setting CrestlevelOpeningsHeight cannot be imported, model parameter setting not available.
- Case setting StructureDynamicsFactor cannot be imported, model parameter setting not available.
- Case setting Steady cannot be imported, model parameter setting not available.
- Computational grid import: 1 grid points were skipped in branch '<id>' because there are structures defined at these locations.
- There is no longer a gridpoint on structures necessary.
- Friction data of definition <id> of cross-section <id> has not been found. The main bed of branch <id> is used as roughness data.
- This warning is related to a network element that is no longer available in the model after it has been deleted by a user.
- Friction BDFR <id> is linked to branch definition <id> without any tabulated, standard or river profiles; ignored.
- Friction BDFR <id> is linked to branch that does not exist (id 0); ignored.
- No location with id = <id> found
Compare simulation results and modify model data
Change the numerical parameters Iadvec1D from 4 to 1 and Limtyphu1D from 100 to 0 according to SOBEK 3 user manual, section 5.10.2.10 (Parameter set for comparison with SOBEK 2, Deltares Systems, 2013).
Run a simulation with your modified SOBEK 2 model with the channel flow module only.
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Modify the SOBEK 2 model in such a way that the corresponding SOBEK 3 model produces the same results. This is not possible in all cases (Meijer, 2015).
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Finalization 1D-Flow
Finalization
Preface
Within the finalization phase, Add features that could not be imported from the original SOBEK 2 model must be added:
- For lateral stations where the inflow is computed with the rational method, corresponding objects must be modelled in a Rainfall-Runoff model.
- Open water nodes from the rainfall-runoff module must be schematized in the D-Flow 1d 1D network.
- Hydraulic structures from the rainfall-runoff module must be added to the D-Flow 1d 1D network.
If the model has a long history, modify your model according to good modeling practice:
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Consider to use the scripting feature of SOBEK 3. Example scripts are delivered with SOBEK 3.
Lateral stations in 1D-Flow with rational method
If your SOBEK 2 1D-Flow model contains lateral stations that get inflow from rainfall-runoff features like
- rational method
- rational method with intensity from Rainfall Station
these features must be added manually within a rainfall-runoff (D-RR) model.
- Add a new model to the project:
- right mouse-click on the project, choose "New Model...":
- Select "Rainfall Runoff Model"
- Move it to integrated model
- Import precipitation data (a *.bui file) from your SOBEK 2 model
- Create catchments
- modify the open water property
- fill in the catchment area
- choose the appropriate Rainfall Station (corresponds to the precipitation data)
- connect the catchment to the corresponding lateral node in the water flow 1d network.
References
Deltares Systems (2013): 1D/2D modelling suite for integral water solutions / SOBEK Suite / D-Flow 1D and D-Real Time Control in Delta Shell / User manual. Version: 3.0.1.29328, 30 July 2013 Deltares: Delft, The Netherlands.
Meijer, D. (2015): Results acceptance test FLOW 1D and RTC SOBEK 3. Deltares draft report 1205718-000-DSC-0124-v1.
Velner, R.; Meijers, E.; KetelaatKetelaar, H.; Heeringen, J.-J.; Stout, J.; van Putten, H. (2013): Pilot: testen van SOBEK3.1 o.b.v. DeltaShell bij Waterschap Rivierenland. Eindrapport. Waterschap Rivierenland. file: PilotSobekDeltaShellWSRL_Groeidocument_v09_final.doc
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