1
The 15th MIKE by DHI UK User Group Meeting
Sharing Experience of Flood Modelling
Using MIKE 21
Dr Lei Yang
Arup
4 Pierhe...
2
Case study 1
Port Talbot
A harbour
A brook
Trash screen and
buried culvert
West End
Industry site
Historical flooding
3
Case study 1
As Build
A highway project
Distributor road
4.8km link Port
Talbot and docks to
M4
Funding £106m
FRA - a pa...
4
Case study 1
Baseline
• Topo survey
• River section
• FEH
• ReFH
• Harbour
water level
5
Case study 1
Existing
model
• Grid sizes
• 1-2m
• 10-20m
• Open
boundaries
• Inflow
discharge
• Downstream
water level
6
Case study 1
As Build
model
• Ditches
along
back road
• Highway
culvert in
West End
• Extended
open
channel
to the
brook
7
Case study 1
Application of weir structure
• Weirs (definition of contracted weir)
• Brick / concrete Wall
• Field Emban...
8
Case study 1
Headlosses of the culvert structure
3 arch culverts, L-W table, manning 0.013, L 28m, IL 6.5 to 6.4 mOD.
Q
...
9
Some discussions
Structures in 2D
• Conservative computation of headloss of culvert structure
• Model build features
(cu...
10
Case study 1
Predicted
flooding
• QMED
• West End
• Industry
site
11
Case study 1
Mitigation
• New open channel
diverting flood
• Flood free up to
Q100CC for the
industry site
• Restrictio...
12
Case study 2
Brize Norton
• Infrastructure design
• Historical flooding
• Three brooks
• Buried culverts
• FRA
• Full p...
13
Case study 2
Design drawing
and model domain
14
Case study 2
Flexible meshes of
model domain
• 0.5m channel
• 5 - 20m land
15
Case study 2
Design drawing
and model domain
• First phase building
16
Case study 2
Design model
3D view
• The foundation
levels
17
Case study 2
Model build
(existing – 1m LiDAR)
18
Case study 2
Structure challenge
• Buried culvert
• Culvert survey
• CulvertMaster
• Culvert capacity
• Source and sinks
19
Case study 2
Flood
prediction
• Design flood
Q100CC
• Historical
records of a
1in200 RP
flood
20
Case study 2
Flood
prediction
• Historical
records of a
1in200 RP
flood
21
Case study 2
Flood
prediction
• movie
22
Any questions?
Contact: lei.yang@arup.com
Thanks you!
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Sharing Experiences of Flood Modelling Using MIKE 21

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Sharing Experiences of Flood Modelling Using MIKE 21 - Dr Lei Yang (Arup)

MIKE by DHI 15th UK User Group Meeting - Tuesday 19 March 2013

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Sharing Experiences of Flood Modelling Using MIKE 21

  1. 1. 1 The 15th MIKE by DHI UK User Group Meeting Sharing Experience of Flood Modelling Using MIKE 21 Dr Lei Yang Arup 4 Pierhead Street Capital Waterside Cardiff CF10 4QP United Kingdom d +44 29 2026 6686 www.arup.com
  2. 2. 2 Case study 1 Port Talbot A harbour A brook Trash screen and buried culvert West End Industry site Historical flooding
  3. 3. 3 Case study 1 As Build A highway project Distributor road 4.8km link Port Talbot and docks to M4 Funding £106m FRA - a part of the development Permission grant from EA
  4. 4. 4 Case study 1 Baseline • Topo survey • River section • FEH • ReFH • Harbour water level
  5. 5. 5 Case study 1 Existing model • Grid sizes • 1-2m • 10-20m • Open boundaries • Inflow discharge • Downstream water level
  6. 6. 6 Case study 1 As Build model • Ditches along back road • Highway culvert in West End • Extended open channel to the brook
  7. 7. 7 Case study 1 Application of weir structure • Weirs (definition of contracted weir) • Brick / concrete Wall • Field Embankment • Flood bund L-W table • W2 = W1 • L2 = L1 +3m glasswall L1 W1
  8. 8. 8 Case study 1 Headlosses of the culvert structure 3 arch culverts, L-W table, manning 0.013, L 28m, IL 6.5 to 6.4 mOD. Q (m3/s) V (m/s) D (m) HWL (mOD) Headloss (mm) Mike 21 11 1.0 0.87 7.94 670 CulvertMaster 11 1.63 0.87 7.54 270
  9. 9. 9 Some discussions Structures in 2D • Conservative computation of headloss of culvert structure • Model build features (currently culvert in Mike 21 is specified as a cross-section, suggesting to develop it as two cross-sections for inlet and outlet locations therefore the culvert could be placed through under a barrier) • Construction (sandbag bund, speed humps, ramp) (weir structure (line structure in 2D), block structure (large geometry structure in 2D?) • Output functions for Q, V, D and headloss of structure (currently no output specifications for structure rather retrieving data from 2D horizontal field; suggesting to add output functions for structures such as discharge of culvert, spill of weir etc)
  10. 10. 10 Case study 1 Predicted flooding • QMED • West End • Industry site
  11. 11. 11 Case study 1 Mitigation • New open channel diverting flood • Flood free up to Q100CC for the industry site • Restriction of invert levels • Overtopping • New culvert under highway releasing flood • Reduced flood risk to West End area
  12. 12. 12 Case study 2 Brize Norton • Infrastructure design • Historical flooding • Three brooks • Buried culverts • FRA • Full planning application • 2D overland flood flow modelling
  13. 13. 13 Case study 2 Design drawing and model domain
  14. 14. 14 Case study 2 Flexible meshes of model domain • 0.5m channel • 5 - 20m land
  15. 15. 15 Case study 2 Design drawing and model domain • First phase building
  16. 16. 16 Case study 2 Design model 3D view • The foundation levels
  17. 17. 17 Case study 2 Model build (existing – 1m LiDAR)
  18. 18. 18 Case study 2 Structure challenge • Buried culvert • Culvert survey • CulvertMaster • Culvert capacity • Source and sinks
  19. 19. 19 Case study 2 Flood prediction • Design flood Q100CC • Historical records of a 1in200 RP flood
  20. 20. 20 Case study 2 Flood prediction • Historical records of a 1in200 RP flood
  21. 21. 21 Case study 2 Flood prediction • movie
  22. 22. 22 Any questions? Contact: lei.yang@arup.com Thanks you!

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