Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Sharing Experiences of Flood Modelling Using MIKE 21

2,909 views

Published on

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

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

Published in: Technology, Business
  • Be the first to comment

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!

×