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Huite Bootsma
Coupling RIBASIM to a
MODFLOW groundwater
model
Why?
3
https://www.destentor.nl/harderwijk/dode-karpers-in-drooggevallen-vijvers-rond-kasteel-
in-hierden~a53c99d8/
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Why?
• Groundwater is the largest terrestrial water
store
• Groundwater models are extensively used
in water management studies
• Most effects are found at the surface
− Water availability
− Ecological baseflows
• Large impact of water management –
especially in highly engineered systems
such as the Netherlands
• We require instruments to simulate both
groundwater and managed surface water
4
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History
Started with hardcoded water distribution network in the
eighties
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5
Goeller, B. F. (1983). Policy analysis of water management
for the Netherlands. Vol I: Summary report. R-2500/1
NETH for Rijkswaterstaat.
History
Regional (water boards):
• SIMGRO as integrated hydrological model
• Complex and gradually out of use
Nationally, Rijkswaterstaat:
• MOZART & Distribution model (DM)
• Part of the current National Hydrologic Model
• Poorly maintained, difficult to check
• Awkward coupling
Needs replacement → RIBASIM
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6
Challenges
Computational cost versus sufficient detail for
interpretability (what does a groundwater level on
a 10 by 10 km mean?)
Large difference in time scales between
subdomains:
• Unsaturated zone
• Saturated zone
• Surface water
Requires (dramatic!) simplifications for tractable
simulations
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7
Surface water: RIBASIM
8
• The model keeps track of water volume in
basins over time.
• More is needed for a water resources
model
• Three layers:
− Physical: Each basin has a storage S and
inflows and outflows Q
𝑑𝑆
𝑑𝑡
= 𝑄𝑖𝑛 − 𝑄𝑜𝑢𝑡
− Control: Pump water out when needed
− Allocation: Distribute water
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Ribasim.jl: physical
A basic network consists of Basin
nodes: these store water
Basins are connected with
different types of connections:
these regulate flow
9
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Ribasim.jl: control
10
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Ribasim.jl & friends
11
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RIBASIM-lumping: Pilot De Hooge Raam (Aa and Maas)
12
Detailed D-Flow FM model (Delft3D FM Suite 1D2D)
available with 2500 calculation points
Courtesy:
Harm Nomden, SWECO
1
3
Split nodes: 1 weir > 2 basins
Courtesy:
Harm Nomden, SWECO
Split nodes: 4 weirs - 5 basins
Courtesy:
Harm Nomden, SWECO
Split nodes: 9 weirs - 10 basins
Courtesy:
Harm Nomden, SWECO
Split nodes: 14 weirs - 15 basins
Courtesy:
Harm Nomden, SWECO
Split nodes: 24 weirs - 25 basins
Courtesy:
Harm Nomden, SWECO
Lumping result
Courtesy:
Harm Nomden, SWECO
Comparison output D-Flow FM* vs RIBASIM
20
Courtesy:
Harm Nomden, SWECO
*D-Flow FM is the hydrodynamic module of the Delft3D FM Suite 1D2D
Comparison output D-Flow FM* vs RIBASIM
21
Courtesy:
Harm Nomden, SWECO
*D-Flow FM is the hydrodynamic module of the Delft3D FM Suite 1D2D
Comparison output D-Flow FM vs RIBASIM
Simulation length D-Flow FM RIBASIM
Peak discharge
3 days
29 minutes 10 basins 9 seconds
58 basins 12 seconds
1 year ?? 58 basins 53 seconds
Courtesy:
Harm Nomden, SWECO
Surface water in MODFLOW
• Surface water is a boundary condition in
MODFLOW
• Surface water bodies are generally represented
by the River package in MODFLOW
• Each cell of the groundwater model is assigned
a River boundary
• Discharge to the River is linear function of:
aquifer head – river stage
• Infiltration is limited when the aquifer head falls
below the river bed elevation
23
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RIBASIM-MODFLOW coupling
RIBASIM simulates surface
water: result in a water level
Set water level in MODFLOW
MODFLOW computes
groundwater-surface water
exchange
Return net flows to RIBASIM
24
RIBASIM (surface water)
(libribasim.DLL)
MODFLOW 6 (groundwater)
(libmf6.DLL)
stage
Dis-
charge
imodc.exe
(Python
application)
Hooge Raam: Basin delineation
Illustrate the principals of the
MODFLOW coupling with the Hooge
Raam area:
Divided into 53 basins: lumped
hydrological representations
25
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Hooge Raam: Basin results
Results from the “lumped”
basins: with representative
water levels
26
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Hooge Raam: Basin delineation
Illustrate the principals of the
MODFLOW coupling with the Hooge
Raam area:
Divided into 53 basins: lumped
hydrological representations
Let’s focus on this area
27
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Hooge Raam: MODFLOW River boundary
Shown here is the main
watercourse
25 m grid resolution
28
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Hooge Raam: Surface water slope within basin
River bed elevation
can show relevant
slope within a
single basin
29
Hooge Raam: D-Flow FM nodes
We have derived the hydraulic properties
of the RIBASIM Basins from a hydraulic
model (Delft3D FM Suite 1D2D):
D-Flow FM nodes → RIBASIM basin
We can also go in reverse direction:
RIBASIM basin → D-Flow FM nodes
water levels
These nodes provide sufficient detail for
MODFLOW
30
DSD-INT
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Hooge Raam: Distributed water levels
The Basin / subgrid table
contains a piecewise
linear interpolation from
the basin level (by
node_id) to the detailed
element (subgrid_id)
31
Hooge Raam: Couple detailed water levels to MODFLOW
MODFLOW River boundary 42
linked to subgrid element 108,
which is located in basin 11
Coupling link can be spatially
verified
32
Hooge Raam: Results
Single basin, water
levels at three
locations marked by a
red cross
33
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Conclusion
RIBASIM contains simplified relations for spatially “lumped”
hydrologic units: basins
The parameters are derived from spatially distributed data
Translate basin level back to spatially distributed water levels
Set spatially distributed water levels in MODFLOW coupling
MODFLOW computes groundwater-surface water exchange,
lumped by RIBASIM
34
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info@deltares.nl
@deltares linkedin.com/company/deltares
www.deltares.nl
@deltares facebook.com/deltaresNL
Thank you!

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DSD-INT 2023 Coupling RIBASIM to a MODFLOW groundwater model - Bootsma

  • 1. Huite Bootsma Coupling RIBASIM to a MODFLOW groundwater model
  • 3. Why? • Groundwater is the largest terrestrial water store • Groundwater models are extensively used in water management studies • Most effects are found at the surface − Water availability − Ecological baseflows • Large impact of water management – especially in highly engineered systems such as the Netherlands • We require instruments to simulate both groundwater and managed surface water 4 DSD-INT 2023 | Hydrology User Days
  • 4. History Started with hardcoded water distribution network in the eighties DSD-INT 2023 | Hydrology User Days 5 Goeller, B. F. (1983). Policy analysis of water management for the Netherlands. Vol I: Summary report. R-2500/1 NETH for Rijkswaterstaat.
  • 5. History Regional (water boards): • SIMGRO as integrated hydrological model • Complex and gradually out of use Nationally, Rijkswaterstaat: • MOZART & Distribution model (DM) • Part of the current National Hydrologic Model • Poorly maintained, difficult to check • Awkward coupling Needs replacement → RIBASIM DSD-INT 2023 | Hydrology User Days 6
  • 6. Challenges Computational cost versus sufficient detail for interpretability (what does a groundwater level on a 10 by 10 km mean?) Large difference in time scales between subdomains: • Unsaturated zone • Saturated zone • Surface water Requires (dramatic!) simplifications for tractable simulations DSD-INT 2023 | Hydrology User Days 7
  • 7. Surface water: RIBASIM 8 • The model keeps track of water volume in basins over time. • More is needed for a water resources model • Three layers: − Physical: Each basin has a storage S and inflows and outflows Q 𝑑𝑆 𝑑𝑡 = 𝑄𝑖𝑛 − 𝑄𝑜𝑢𝑡 − Control: Pump water out when needed − Allocation: Distribute water DSD-INT 2023 | Hydrology User Days
  • 8. Ribasim.jl: physical A basic network consists of Basin nodes: these store water Basins are connected with different types of connections: these regulate flow 9 DSD-INT 2023 | Hydrology User Days
  • 11. RIBASIM-lumping: Pilot De Hooge Raam (Aa and Maas) 12 Detailed D-Flow FM model (Delft3D FM Suite 1D2D) available with 2500 calculation points Courtesy: Harm Nomden, SWECO
  • 12. 1 3
  • 13. Split nodes: 1 weir > 2 basins Courtesy: Harm Nomden, SWECO
  • 14. Split nodes: 4 weirs - 5 basins Courtesy: Harm Nomden, SWECO
  • 15. Split nodes: 9 weirs - 10 basins Courtesy: Harm Nomden, SWECO
  • 16. Split nodes: 14 weirs - 15 basins Courtesy: Harm Nomden, SWECO
  • 17. Split nodes: 24 weirs - 25 basins Courtesy: Harm Nomden, SWECO
  • 19. Comparison output D-Flow FM* vs RIBASIM 20 Courtesy: Harm Nomden, SWECO *D-Flow FM is the hydrodynamic module of the Delft3D FM Suite 1D2D
  • 20. Comparison output D-Flow FM* vs RIBASIM 21 Courtesy: Harm Nomden, SWECO *D-Flow FM is the hydrodynamic module of the Delft3D FM Suite 1D2D
  • 21. Comparison output D-Flow FM vs RIBASIM Simulation length D-Flow FM RIBASIM Peak discharge 3 days 29 minutes 10 basins 9 seconds 58 basins 12 seconds 1 year ?? 58 basins 53 seconds Courtesy: Harm Nomden, SWECO
  • 22. Surface water in MODFLOW • Surface water is a boundary condition in MODFLOW • Surface water bodies are generally represented by the River package in MODFLOW • Each cell of the groundwater model is assigned a River boundary • Discharge to the River is linear function of: aquifer head – river stage • Infiltration is limited when the aquifer head falls below the river bed elevation 23 DSD-INT 2023 | Hydrology User Days
  • 23. RIBASIM-MODFLOW coupling RIBASIM simulates surface water: result in a water level Set water level in MODFLOW MODFLOW computes groundwater-surface water exchange Return net flows to RIBASIM 24 RIBASIM (surface water) (libribasim.DLL) MODFLOW 6 (groundwater) (libmf6.DLL) stage Dis- charge imodc.exe (Python application)
  • 24. Hooge Raam: Basin delineation Illustrate the principals of the MODFLOW coupling with the Hooge Raam area: Divided into 53 basins: lumped hydrological representations 25 DSD-INT 2023 | Hydrology User Days
  • 25. Hooge Raam: Basin results Results from the “lumped” basins: with representative water levels 26 DSD-INT 2023 | Hydrology User Days
  • 26. Hooge Raam: Basin delineation Illustrate the principals of the MODFLOW coupling with the Hooge Raam area: Divided into 53 basins: lumped hydrological representations Let’s focus on this area 27 DSD-INT 2023 | Hydrology User Days
  • 27. Hooge Raam: MODFLOW River boundary Shown here is the main watercourse 25 m grid resolution 28 DSD-INT 2023 | Hydrology User Days
  • 28. Hooge Raam: Surface water slope within basin River bed elevation can show relevant slope within a single basin 29
  • 29. Hooge Raam: D-Flow FM nodes We have derived the hydraulic properties of the RIBASIM Basins from a hydraulic model (Delft3D FM Suite 1D2D): D-Flow FM nodes → RIBASIM basin We can also go in reverse direction: RIBASIM basin → D-Flow FM nodes water levels These nodes provide sufficient detail for MODFLOW 30 DSD-INT 2023 | Hydrology User Days
  • 30. Hooge Raam: Distributed water levels The Basin / subgrid table contains a piecewise linear interpolation from the basin level (by node_id) to the detailed element (subgrid_id) 31
  • 31. Hooge Raam: Couple detailed water levels to MODFLOW MODFLOW River boundary 42 linked to subgrid element 108, which is located in basin 11 Coupling link can be spatially verified 32
  • 32. Hooge Raam: Results Single basin, water levels at three locations marked by a red cross 33 DSD-INT 2023 | Hydrology User Days
  • 33. Conclusion RIBASIM contains simplified relations for spatially “lumped” hydrologic units: basins The parameters are derived from spatially distributed data Translate basin level back to spatially distributed water levels Set spatially distributed water levels in MODFLOW coupling MODFLOW computes groundwater-surface water exchange, lumped by RIBASIM 34 DSD-INT 2023 | Hydrology User Days