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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