FME Usage in Dynamic Flood Calculations


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When performing fully dynamic 1D + 2D flood calculation, digital terrain models and result processing is essential. This presentation will desrcibe how FME can be used to manipulate digital terrain models and postprocess flood results.

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FME Usage in Dynamic Flood Calculations

  1. 1. CONNECT. TRANSFORM. AUTOMATE. FME Usage In Dynamic Flood Calculation Henrik Thorén Civilengineer, Hydraulic Specialist
  2. 2. Rambøll !  Engineering consultancy company !  Around 10 000 employees worldwide !  Originates from Denmark !  Denmark, Sweden, Norway, Finland and United Kingdom !  About 200 offices in 20 countries C Bella Sky Hotel Rambøll Head Office Femer Bælt Tunnel
  3. 3. Henrik Thorén !  Sweden !  Climate Adaption and Storm Water Management !  Dynamic flood mapping with DHI software (Danish Hydrology Institute) !  MIKE Urban, MIKE 11 and MIKE 21 !  2-way and 3-way coupling (MIKE Flood) !  FME and ArcGIS !  Hydro model for Gothenburg
  4. 4. !  Manipulation of DTM !  Post Process flood results Agenda
  5. 5. Manipulate DTM !  In a DTM, buildings are “cut” away and a flat surface is interpolated over the area that the house covers !  In flood calculation, buildings are structures that will redirect the flow of the water, thus buildings have to be projected in the DTM
  6. 6. Manipulation of DTM C Before AfterDTM with shape file
  7. 7. Principal solution - I Input Shapes Clipper Inside Clipper OutsideInput Raster Clipper Transformer RasterCell Replacer Change value to 5 RasterCellValue Calcualtor Operator + 5 5 5 DTM + 5
  8. 8. Principal solution - II RasterMosaicker RasterCellValue Calcualtor Operator + Clipper Outside DTM + 5
  9. 9. FME solution
  10. 10. Post process flood results !  The main purpose is to calculate the volume of the flooded water and the flooded area !  As a bonus, this can be done for each “flood island” or to a specific area. !  The workspace can analyse multiple flood results independently in the same workspace C
  11. 11. Principal solution - I Raster Flood Result Shape file with flood islands Excel file with statistics Input Output
  12. 12. Principal solution - II Raster Flood Result RasterCell Coercer RasterExtents Coercer - Data Extents PointOnArea Overlayer - Count overlaps - Create a list of the flood depth in each point Count List
  13. 13. Principal solution - III PointOnArea Overlayer Count List PythonCaller + AttributeCreator - Calculate the total flooded area and volume of the flooded water Shape file Excel file
  14. 14. FME solution - I
  15. 15. FME solution - II
  16. 16. !  Statistics in excel format that can be presented in diagrams Results 0 500000 1000000 1500000 2000000 2500000 3000000 B_Å1_MQ2100_2 6t_S B_Å1_HQ2100_2 6t_S B_Å1_MQ2100_1 0t_S B_Å1_HQ2100_1 0t_S B_Å1_MQ2100_1 0t_Ö B_Å1_HQ2100_1 0t_Ö B_Å1_HQ2100_2 6t_S_P26 B_Å2_MQ2100_2 6t_S B_Å2_HQ2100_2 6t_S B_Å2_MQ2100_1 0t_S B_Å2_HQ2100_1 0t_S Area(m2)/Volym(m3) Scenario Översvämmad yta (m2) Volym av översvämmat vatten (m3)
  17. 17. Thank You! !  Questions? !  For more information: !  Henrik Thorén, !  Rambøll ! ! CONNECT. TRANSFORM. AUTOMATE.