際際滷

際際滷Share a Scribd company logo

Rahman khatibi ciwem_isis2_d

Download as PPT, PDF
R
Rahman Khatibi

This are the slides of my presentation on 3 December 2009 in an evening meeting organised by the CIWEM Southwest Branch. Venue: Peter Brett Associates, Reading

Convert to study guideBETA

Transform any presentation into a summarized study guide, highlighting the most important points and key insights.

1 of 43
Downloaded 10 times
The Practice of 2D Floodplain Modelling: ISIS 2D Dr Rahman Khatibi Central Southern Branch - CIWEM 3 December 2009 Venue: Peter Brett Associates, Reading This presentation has the focus on: 1. 2D modelling 2. ISIS 2D 3. Applications of ISIS 2D 4. Future possibilities 1 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khatibi
Setting the scene The ISIS 1D Model Objectives of 1D modelling: (i) depth h (ii) area-averaged variable u (Q) at all nodal points. The ISIS 2D Model Objectives of 2D modelling: (i) depth h (ii) depth-averaged variable u,v (qx, qy) at all grid points. TVD 2 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
Setting the scene Considering Flooding Risk from all sources Space scale Remote sensing Interfaces Modularity Meteorological models Time scale Data Gauges Modelling Global, regional, local Survey data LiDAR systems Survey data Time scale Surfacewate Space scale r models 0D Supercritical Subcritical Flow Hydrologic 1D regimes Kinematic Role waves models 1D+ Urban Rural Semi-urban Sewers 2D- Coastal models models (tides + surges) Land use 2D Brownfield Greenfield 2D+ Groundwate Reservoir failures New development r models models 3D Blockage Inundation Erosio Fluvial models Trigger events (channels + floodplains n Overtopping Breaching 3 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
Summary 1. What is 2D modelling? 2. What is ISIS 2D? 3. ISIS 2D applications 4. Looking to the future Focus on: Modularity of modelling engines Plurality in developing 2D solvers Integration with GIS Interfaces and their intuitiveness Improved topographic data shifts uncertainty to roughness Model management for their defensibility 4 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. 2D Modelling the technical details Solves the Shallow Water Equations: Mass balance Inertia Convection Surface slope Bed friction Eddy viscosity On a grid of square cells or unstructured mesh Various solvers: e.g. ADI or TVD 5 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. ADI Solver Alternating Direction Implicit Roots: uses the scheme given by Stelling (1984) Numerical Scheme: Reinvents 1D solvers in the 2D domain in each direction but staggered Outcome implicit solver (large time step) Applicability: Good for floodplain flows Copes with most of breach problems Limitations: Problems with supercritical flows Water depth x-component specific discharge y-component specific discharge Bed elevation 6 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. TVD Solver - Total Variation Diminishing Roots: McCormack scheme (1969) Numerical Scheme: Predictor-corrector ensures numerical oscillations do not develop Non-staggered velocities are solved at cell centres Applicability: Subcritical and supercritical flows Dambreak flows, Spillways, Breaching, Steep surface water flows Limitations: computationally intensive 7 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. Simplified Mass Balance Schemes Roots: Bates and Roo (2000) So much for so little: First come, first served + Seeking for the lowest cell Applicability: Broad scale surface water risk assessment Coastal inundation modelling Modelling surface water from sewer surcharging Limitations: completely ignores momentum 8 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. Evolutionary background to 2D Modelling Fundamental thinking of 18th-19th Century 18th-19th Century Intellectual Capital of hydraulic Traditional component hydraulics 1900 Tapping on the intellectual capital By a fury of simplified methods Empirical hydraulics 1950 Design and operations 1960 Advent of Computers Hydrology Rise of software engineering Component analysis 1980 Increasing data Tur 1D bul Modelling practice 1990 enc em 3D 2D ode l l i ng 2000 Intelligent Emergence of flood risk management clients Modelling Beck: risk increasing Modelling and modelling 9 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. 2D versus 1D Modelling Advantages of 1D: Barriers to 2D models before 2000 Some vector data not much raster Coping with many degrees of grid data freedom: gates, weirs, bridges, Prohibitive model run times tributaries, abstractions Since 2000 Fast runs Paradigm shift by LiDAR tech Disadvantages: Improved computational speed TUFLOW at the place, right time Artificially selecting flow paths two examples Defensibility of decisions on Now: 1D survived besides 2D floodplain flow paths Focus on uncertainty moved from data to others: e.g. hydrology, roughness Opportunities for innovation 1012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
1. Flagging Salient Points: Modularity Fast spreading 0D No equations Longitudinal variations Classic 2-stage channels 1D Continuity+ 1-momentum Attenuating floodplains 1D+ Mass balance Storage floodplains 2D- Mass balance + Diffusive FP Slow overland flows To model lateral variations 2D Continuity+ 2-momentum Urban, coastal, floodplains 2D+ Continuity+ 2-momentum + a good solver Hydraulic jumps/Roll waves 3D Mixing required Continuity+ 3-momentum Opportunities for innovation Modularity in modelling engines Each 2D solver has a selective advantage Focus on uncertainty shifted from data to Model management for defensibility 1112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. ISIS 2D Background Capability: ISIS 2D uses the Shallow Water Equations Roots: DIVAST by Prof. Falconer - Cardiff University Applicable to: fluvial floodplains coastal floodplains natural channels, surface water flows, spillways etc. Part of the ISIS Suite 1212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. The ISIS Suite Integrated with ISIS Mapper for pre-processing and post-processing Other GIS packages may be used ISIS (1D) OpenMI 1312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. ISIS 2D Domains Domains and Schematisation Contours Road 2D Domain 1 Embedded Extended 1D 1D Model High Sections Resolution Flood Relieve Channels 1D Reservoir 2D Domain 3 2D Domain 2 Low Resolution Medium Resolution Contours 1412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. ISIS2D Modelling the Interface For each domains: Grid data Boundary conditions Hydrology Run details select the solver Output details 1512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Data Data management: 1. ASCII raster for grid, (DTM) 2. Shapefiles for vector Active areas Position of boundary conditions 1D/2D Linkage lines 3. Textfiles for hydrographs Boundary inputs Some of the outputs 4. Binary Outputs Intuitive folder structures and not many files 1612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Load DTM 1712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Define active area 1812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Define boundary condition vectors 1912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Add topography vector data 2012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Running 2D Interface 2112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Visualise Results 2212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
2. Flagging salient points ISIS philosophy to innovation: Modularity of modelling engines Solver status: ADI and TVD released ISIS FAST to be released ISIS FAST A cellular solver planned Integrated with GIS Ease of use by intuitive interfaces Model management for defensibility 2312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. ISIS 2D Applications In-house benchmarking tests for all three solvers Just completed the EAs 2D model benchmarking tests evaluation at Herriot-Watt University Wide applications to project works ADI Speed: comparable to TUFLOW or better TVD is slower due to small time steps required 2412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. ADI: Example 1 Reservoir breach Description of the model: Location: a town somewhere in Wiltshire Trigger event: reservoir breach Model description: description Data as shown before Used a global roughness value Run the model and analyse the results Use the ADI solver ADI 2512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. ADI: Example 2 River Severn at Upton Linked 1D-2D model Channel floodplain exchanges over bank and through culverts A DI This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 2612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
ADI: Example 2 River Severn at Upton 2712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. TVD: Classic hydraulics Hydraulic jumps 2812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
TVD: Example 1 Laboratory flume dambreak (FP5 IMPACT Project) These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 2912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. TVD: Example 1 Laboratory flume dambreak (FP5 IMPACT Project) 3512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. An example from ISIS FAST Area of Interest Digital Terrain Model These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. An example from ISIS FAST Results (Depths) Overlaid These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. An example from ISIS FAST These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. ADI, TVD or Raster Routing? horses for courses AD TV I D This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 3912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. ADI and TVD: Surface water flooding in Glasgow s ve llwa Ro Red blobs show Froude No >1 Two flow case: 1. Rainfall -ADI 2. Sewer flood - TVD This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 4012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
3. Flagging Salient Topics Observations: we saw in action Modularity of modelling engines Different 2D solvers horses for courses Integration of modelling engines with GIS Intuitive interfaces The ease to gain an insight into problems The focus on uncertainty shifted from topographic data to roughness and other factors Model management is taking a new meaning 4112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
4. Future developments Cellular flow model quicker solution for many floodplain problems FAST model simple hydraulics for rapid surface water analysis Implicit linking of 1D and 2D domains improved stability Direct linking of multiple domains allows nesting of high resolution areas 2D water quality 4212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
5. Conclusion Innovation in 2D Modelling has a positive effect on flood risk management, including: Reduced uncertainty due to topographic details Efficiency of modelling studies The ability to gain an insight into problems Improved defensibility of models New dimensions in model management 4312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat

More Related Content

Rahman khatibi ciwem_isis2_d

  • 1. The Practice of 2D Floodplain Modelling: ISIS 2D Dr Rahman Khatibi Central Southern Branch - CIWEM 3 December 2009 Venue: Peter Brett Associates, Reading This presentation has the focus on: 1. 2D modelling 2. ISIS 2D 3. Applications of ISIS 2D 4. Future possibilities 1 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khatibi
  • 2. Setting the scene The ISIS 1D Model Objectives of 1D modelling: (i) depth h (ii) area-averaged variable u (Q) at all nodal points. The ISIS 2D Model Objectives of 2D modelling: (i) depth h (ii) depth-averaged variable u,v (qx, qy) at all grid points. TVD 2 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 3. Setting the scene Considering Flooding Risk from all sources Space scale Remote sensing Interfaces Modularity Meteorological models Time scale Data Gauges Modelling Global, regional, local Survey data LiDAR systems Survey data Time scale Surfacewate Space scale r models 0D Supercritical Subcritical Flow Hydrologic 1D regimes Kinematic Role waves models 1D+ Urban Rural Semi-urban Sewers 2D- Coastal models models (tides + surges) Land use 2D Brownfield Greenfield 2D+ Groundwate Reservoir failures New development r models models 3D Blockage Inundation Erosio Fluvial models Trigger events (channels + floodplains n Overtopping Breaching 3 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 4. Summary 1. What is 2D modelling? 2. What is ISIS 2D? 3. ISIS 2D applications 4. Looking to the future Focus on: Modularity of modelling engines Plurality in developing 2D solvers Integration with GIS Interfaces and their intuitiveness Improved topographic data shifts uncertainty to roughness Model management for their defensibility 4 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 5. 1. 2D Modelling the technical details Solves the Shallow Water Equations: Mass balance Inertia Convection Surface slope Bed friction Eddy viscosity On a grid of square cells or unstructured mesh Various solvers: e.g. ADI or TVD 5 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 6. 1. ADI Solver Alternating Direction Implicit Roots: uses the scheme given by Stelling (1984) Numerical Scheme: Reinvents 1D solvers in the 2D domain in each direction but staggered Outcome implicit solver (large time step) Applicability: Good for floodplain flows Copes with most of breach problems Limitations: Problems with supercritical flows Water depth x-component specific discharge y-component specific discharge Bed elevation 6 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 7. 1. TVD Solver - Total Variation Diminishing Roots: McCormack scheme (1969) Numerical Scheme: Predictor-corrector ensures numerical oscillations do not develop Non-staggered velocities are solved at cell centres Applicability: Subcritical and supercritical flows Dambreak flows, Spillways, Breaching, Steep surface water flows Limitations: computationally intensive 7 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 8. 1. Simplified Mass Balance Schemes Roots: Bates and Roo (2000) So much for so little: First come, first served + Seeking for the lowest cell Applicability: Broad scale surface water risk assessment Coastal inundation modelling Modelling surface water from sewer surcharging Limitations: completely ignores momentum 8 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 9. 1. Evolutionary background to 2D Modelling Fundamental thinking of 18th-19th Century 18th-19th Century Intellectual Capital of hydraulic Traditional component hydraulics 1900 Tapping on the intellectual capital By a fury of simplified methods Empirical hydraulics 1950 Design and operations 1960 Advent of Computers Hydrology Rise of software engineering Component analysis 1980 Increasing data Tur 1D bul Modelling practice 1990 enc em 3D 2D ode l l i ng 2000 Intelligent Emergence of flood risk management clients Modelling Beck: risk increasing Modelling and modelling 9 12/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 10. 1. 2D versus 1D Modelling Advantages of 1D: Barriers to 2D models before 2000 Some vector data not much raster Coping with many degrees of grid data freedom: gates, weirs, bridges, Prohibitive model run times tributaries, abstractions Since 2000 Fast runs Paradigm shift by LiDAR tech Disadvantages: Improved computational speed TUFLOW at the place, right time Artificially selecting flow paths two examples Defensibility of decisions on Now: 1D survived besides 2D floodplain flow paths Focus on uncertainty moved from data to others: e.g. hydrology, roughness Opportunities for innovation 1012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 11. 1. Flagging Salient Points: Modularity Fast spreading 0D No equations Longitudinal variations Classic 2-stage channels 1D Continuity+ 1-momentum Attenuating floodplains 1D+ Mass balance Storage floodplains 2D- Mass balance + Diffusive FP Slow overland flows To model lateral variations 2D Continuity+ 2-momentum Urban, coastal, floodplains 2D+ Continuity+ 2-momentum + a good solver Hydraulic jumps/Roll waves 3D Mixing required Continuity+ 3-momentum Opportunities for innovation Modularity in modelling engines Each 2D solver has a selective advantage Focus on uncertainty shifted from data to Model management for defensibility 1112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 12. 2. ISIS 2D Background Capability: ISIS 2D uses the Shallow Water Equations Roots: DIVAST by Prof. Falconer - Cardiff University Applicable to: fluvial floodplains coastal floodplains natural channels, surface water flows, spillways etc. Part of the ISIS Suite 1212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 13. 2. The ISIS Suite Integrated with ISIS Mapper for pre-processing and post-processing Other GIS packages may be used ISIS (1D) OpenMI 1312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 14. 2. ISIS 2D Domains Domains and Schematisation Contours Road 2D Domain 1 Embedded Extended 1D 1D Model High Sections Resolution Flood Relieve Channels 1D Reservoir 2D Domain 3 2D Domain 2 Low Resolution Medium Resolution Contours 1412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 15. 2. ISIS2D Modelling the Interface For each domains: Grid data Boundary conditions Hydrology Run details select the solver Output details 1512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 16. 2. Data Data management: 1. ASCII raster for grid, (DTM) 2. Shapefiles for vector Active areas Position of boundary conditions 1D/2D Linkage lines 3. Textfiles for hydrographs Boundary inputs Some of the outputs 4. Binary Outputs Intuitive folder structures and not many files 1612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 17. 2. Load DTM 1712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 18. 2. Define active area 1812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 19. 2. Define boundary condition vectors 1912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 20. 2. Add topography vector data 2012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 21. 2. Running 2D Interface 2112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 22. 2. Visualise Results 2212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 23. 2. Flagging salient points ISIS philosophy to innovation: Modularity of modelling engines Solver status: ADI and TVD released ISIS FAST to be released ISIS FAST A cellular solver planned Integrated with GIS Ease of use by intuitive interfaces Model management for defensibility 2312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 24. 3. ISIS 2D Applications In-house benchmarking tests for all three solvers Just completed the EAs 2D model benchmarking tests evaluation at Herriot-Watt University Wide applications to project works ADI Speed: comparable to TUFLOW or better TVD is slower due to small time steps required 2412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 25. 3. ADI: Example 1 Reservoir breach Description of the model: Location: a town somewhere in Wiltshire Trigger event: reservoir breach Model description: description Data as shown before Used a global roughness value Run the model and analyse the results Use the ADI solver ADI 2512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 26. 3. ADI: Example 2 River Severn at Upton Linked 1D-2D model Channel floodplain exchanges over bank and through culverts A DI This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 2612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 27. ADI: Example 2 River Severn at Upton 2712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 28. 3. TVD: Classic hydraulics Hydraulic jumps 2812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 29. TVD: Example 1 Laboratory flume dambreak (FP5 IMPACT Project) These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 2912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 30. These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 31. These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 32. These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 33. These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 34. These validation data were produced by the European IMPACT project (see Soares-Frazao and Zech, 2007). Halcrow wish to thank the researchers and funders involved with this project for making their data freely available to all. Further information is available from www.impact-project.net and in a special edition of the Journal of Hydraulics Research published in 2007. 3412/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 35. 3. TVD: Example 1 Laboratory flume dambreak (FP5 IMPACT Project) 3512/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 36. 3. An example from ISIS FAST Area of Interest Digital Terrain Model These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3612/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 37. 3. An example from ISIS FAST Results (Depths) Overlaid These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3712/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 38. 3. An example from ISIS FAST These data were provided by FCC/OPW. Halcrow wish to thank the client for allowing to use their data. The results produced here are hypothetical and just for demonstration purpose. The client has given permission for using the data for demonstration purpose but without approving the results. 3812/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 39. 3. ADI, TVD or Raster Routing? horses for courses AD TV I D This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 3912/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 40. 3. ADI and TVD: Surface water flooding in Glasgow s ve llwa Ro Red blobs show Froude No >1 Two flow case: 1. Rainfall -ADI 2. Sewer flood - TVD This is similar to the benchmarking test set by the EA and the project is run by Herriot Watt University. Halcrows thanks are due to both EA and Herriot Watt University. 4012/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 41. 3. Flagging Salient Topics Observations: we saw in action Modularity of modelling engines Different 2D solvers horses for courses Integration of modelling engines with GIS Intuitive interfaces The ease to gain an insight into problems The focus on uncertainty shifted from topographic data to roughness and other factors Model management is taking a new meaning 4112/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 42. 4. Future developments Cellular flow model quicker solution for many floodplain problems FAST model simple hydraulics for rapid surface water analysis Implicit linking of 1D and 2D domains improved stability Direct linking of multiple domains allows nesting of high resolution areas 2D water quality 4212/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat
  • 43. 5. Conclusion Innovation in 2D Modelling has a positive effect on flood risk management, including: Reduced uncertainty due to topographic details Efficiency of modelling studies The ability to gain an insight into problems Improved defensibility of models New dimensions in model management 4312/23/12 The Practice of 2D Floodplain Modelling: ISIS 2D - Rahman Khat