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. See more presentations from the FME User Conference 2014 at: www.safe.com/fmeuc

1. CONNECT. TRANSFORM. AUTOMATE.
FME Usage In Dynamic Flood
Calculation
Henrik Thorén
Civilengineer, Hydraulic Specialist

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. 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. ! Manipulation of DTM
! Post Process flood results
Agenda

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. Manipulation of DTM
C
Before AfterDTM with
shape file

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. Principal solution - II
RasterMosaicker
RasterCellValue
Calcualtor
Operator +
Clipper Outside
DTM + 5

9. FME solution

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. Principal solution - I
Raster Flood
Result
Shape file with
flood islands
Excel file with
statistics
Input Output

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. 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. FME solution - I

15. FME solution - II

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. Thank You!
! Questions?
! For more information:
! Henrik Thorén, hent@ramboll.com
! Rambøll
! www.ramboll.com
! www.ramboll.com/worldwide
CONNECT. TRANSFORM. AUTOMATE.