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Parameterization
of a RIBASIM
model and the
network lumping
approach
Practical application of RIBASIM
Delft, 2023-11-28
Harm Nomden
1
Practical application of RIBASIM
Content → Challenges / Questions:
RIBASIM in general:
1. What do they mean with ‘basins’?
2. At which resolution do you want to calculate?
Setup modelling schematisation:
3. How can I create/define ‘basins’?
4. How do I fill required settings with data?
Comparison results:
5. Are the modelling results good (enough)?
6. What are the calculation times?
Harm Nomden
Consultant Hydrology at Sweco (Netherlands)
Background:
• 10 yrs international projects and automatisation (python)
• Since 2022 working in the Netherlands
For the TKI project on RIBASIM:
• We have been working on a python toolbox ribasim-lumping
focusing on generation of RIBASIM-model
2
RIBASIM-lumping: Pilot De Hooge Raam (Aa en Maas)
3
Detailed D-Flow FM model of the Delft3D FM Suite 1D2D available
with 2500 calculation points
RIBASIM-lumping: Network lumping
4
1
1
1
1
1
1
1
2
2
2 2
2
2
2
2
3
3 3
3
4
4
2
1
3
4
2
1
3
Definition
split-locations
(split_nodes)
Conversiontable
split-locations →
RIBASIM-nodes
Typical split-locations are weirs
or pumping stations, culverts,
orifices or other structures or
open water connections
split nodes: 1 weir > 2 basins
5
split nodes: 4 weirs - 5 basins
6
split nodes: 9 weirs - 10 basins
7
split nodes: 14 weirs - 15 basins
8
split nodes: 24 weirs - 25 basins
9
split nodes: 57 weirs - 58 basins
10
4 weirs 9 weirs
14 weirs
24 weirs 57 weirs
1 weir
RIBASIM-lumping: Deriving relations
12
stuw
discharge
area units
network
reference
point basin
TabulatedRatingCurve
Basin area
Basin
Model/Data
RIBASIM
Openwater connections: Exchange based on waterlevel difference – Manning-node
Level controlled areas: Horizontal water level in basin – Pump/Outlet
Sloping area / free flowing: Backwatercurve – TabulatedRatingCurve
H-H relation: Waterlevel-Waterlevel – Water level basin versus water level within basin
V-H relation: Volume-Waterlevel – Storage curve basin
Q-H relation: Discharge-Waterlevel – Outflow from basin to other basin
RIBASIM-lumping: Deriving input relations
13
stuw
discharge
area units
network
reference
point basin
TabulatedRatingCurve
Basin area
Basin
Model/Data
RIBASIM
reference point basin
weir
H-H relation
distance [m]
weir height
reference point basin
RIBASIM-lumping: Deriving input relations
14
weir
H-H relation
Add x additional profiles based on
vertical interpolation
Modelling results:
0,05xMA tot 2,00xMA
distance [m]
stuw
discharge
area units
network
reference
point basin
TabulatedRatingCurve
Basin area
Basin
Model/Data
RIBASIM
weir height
RIBASIM-lumping: Deriving input relations
15
V-H relation
Vbasin
m3
0
Hweir,upstream
reference point basin
weir
H-H relation
Add x additional profiles based on
vertical interpolation
Modelling results:
0,05xMA tot 2,00xMA
distance [m]
weir height
Q-H relation based on
model results
Q-H relation
Qweir
0 m3/s
Hweir,upstream
Storage curve based on
model results
m+NAP
m+NAP
reference point basin distance [m]
Vbasin
0
m3
0
m+NAP
RIBASIM-lumping: Deriving input relations
16
weir
Hreference point, basin
weir height
Hweir,upstream
Qbasin
m3/s
Hreference point, basin
Hstuw,upstream
Translation to reference point
V-H relation H-H relation
Q-H relation
m+NAP
Output RIBASIM
17
Comparison output Delft3D FM 1D2D vs RIBASIM
18
Comparison output Delft3D FM 1D2D vs RIBASIM
19
Simulation results are comparable for every number of
basins, because we used a spatially averaged drainage
More spatial variability: rainfall, altitude, slope, soil,
landuse → higher detail and more basins
Practical application of RIBASIM
Content → Challenges / Questions:
RIBASIM in general:
1. What do they mean with ‘basins’?
2. At which resolution do you want to calculate?
Setup modelling schematisation:
3. How can I create/define ‘basins’?
4. How do I fill required settings with data?
Comparison results:
5. Are the modelling results good (enough)?
6. What are the calculation times?
Solutions / Answers:
→ water system/network divided in parts
→ Resolution is dynamic (user-specified) or
→ Definition of split nodes (generates a RIBASIM network using tooling)
→ Data from database or from stationary modelling results
→ Discharge and waterlevels comparable with Delft3D FM 1D2D model
→
20
Simulation length Delft3D FM 1D2D RIBASIM
Peak discharge
3 days
29 minutes 10 basins 9 seconds
58 basins 12 seconds
1 year ?? 58 basins 53 seconds
Open source python package to set-up
a schematisation: github → ribasim_lumping

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DSD-INT 2023 Parameterization of a RIBASIM model and the network lumping approach - Nomden

  • 1. Parameterization of a RIBASIM model and the network lumping approach Practical application of RIBASIM Delft, 2023-11-28 Harm Nomden 1
  • 2. Practical application of RIBASIM Content → Challenges / Questions: RIBASIM in general: 1. What do they mean with ‘basins’? 2. At which resolution do you want to calculate? Setup modelling schematisation: 3. How can I create/define ‘basins’? 4. How do I fill required settings with data? Comparison results: 5. Are the modelling results good (enough)? 6. What are the calculation times? Harm Nomden Consultant Hydrology at Sweco (Netherlands) Background: • 10 yrs international projects and automatisation (python) • Since 2022 working in the Netherlands For the TKI project on RIBASIM: • We have been working on a python toolbox ribasim-lumping focusing on generation of RIBASIM-model 2
  • 3. RIBASIM-lumping: Pilot De Hooge Raam (Aa en Maas) 3 Detailed D-Flow FM model of the Delft3D FM Suite 1D2D available with 2500 calculation points
  • 4. RIBASIM-lumping: Network lumping 4 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 4 4 2 1 3 4 2 1 3 Definition split-locations (split_nodes) Conversiontable split-locations → RIBASIM-nodes Typical split-locations are weirs or pumping stations, culverts, orifices or other structures or open water connections
  • 5. split nodes: 1 weir > 2 basins 5
  • 6. split nodes: 4 weirs - 5 basins 6
  • 7. split nodes: 9 weirs - 10 basins 7
  • 8. split nodes: 14 weirs - 15 basins 8
  • 9. split nodes: 24 weirs - 25 basins 9
  • 10. split nodes: 57 weirs - 58 basins 10
  • 11. 4 weirs 9 weirs 14 weirs 24 weirs 57 weirs 1 weir
  • 12. RIBASIM-lumping: Deriving relations 12 stuw discharge area units network reference point basin TabulatedRatingCurve Basin area Basin Model/Data RIBASIM Openwater connections: Exchange based on waterlevel difference – Manning-node Level controlled areas: Horizontal water level in basin – Pump/Outlet Sloping area / free flowing: Backwatercurve – TabulatedRatingCurve H-H relation: Waterlevel-Waterlevel – Water level basin versus water level within basin V-H relation: Volume-Waterlevel – Storage curve basin Q-H relation: Discharge-Waterlevel – Outflow from basin to other basin
  • 13. RIBASIM-lumping: Deriving input relations 13 stuw discharge area units network reference point basin TabulatedRatingCurve Basin area Basin Model/Data RIBASIM reference point basin weir H-H relation distance [m] weir height
  • 14. reference point basin RIBASIM-lumping: Deriving input relations 14 weir H-H relation Add x additional profiles based on vertical interpolation Modelling results: 0,05xMA tot 2,00xMA distance [m] stuw discharge area units network reference point basin TabulatedRatingCurve Basin area Basin Model/Data RIBASIM weir height
  • 15. RIBASIM-lumping: Deriving input relations 15 V-H relation Vbasin m3 0 Hweir,upstream reference point basin weir H-H relation Add x additional profiles based on vertical interpolation Modelling results: 0,05xMA tot 2,00xMA distance [m] weir height Q-H relation based on model results Q-H relation Qweir 0 m3/s Hweir,upstream Storage curve based on model results m+NAP m+NAP
  • 16. reference point basin distance [m] Vbasin 0 m3 0 m+NAP RIBASIM-lumping: Deriving input relations 16 weir Hreference point, basin weir height Hweir,upstream Qbasin m3/s Hreference point, basin Hstuw,upstream Translation to reference point V-H relation H-H relation Q-H relation m+NAP
  • 18. Comparison output Delft3D FM 1D2D vs RIBASIM 18
  • 19. Comparison output Delft3D FM 1D2D vs RIBASIM 19 Simulation results are comparable for every number of basins, because we used a spatially averaged drainage More spatial variability: rainfall, altitude, slope, soil, landuse → higher detail and more basins
  • 20. Practical application of RIBASIM Content → Challenges / Questions: RIBASIM in general: 1. What do they mean with ‘basins’? 2. At which resolution do you want to calculate? Setup modelling schematisation: 3. How can I create/define ‘basins’? 4. How do I fill required settings with data? Comparison results: 5. Are the modelling results good (enough)? 6. What are the calculation times? Solutions / Answers: → water system/network divided in parts → Resolution is dynamic (user-specified) or → Definition of split nodes (generates a RIBASIM network using tooling) → Data from database or from stationary modelling results → Discharge and waterlevels comparable with Delft3D FM 1D2D model → 20 Simulation length Delft3D FM 1D2D RIBASIM Peak discharge 3 days 29 minutes 10 basins 9 seconds 58 basins 12 seconds 1 year ?? 58 basins 53 seconds Open source python package to set-up a schematisation: github → ribasim_lumping