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FME Usage In Dynamic Flood Calculation Henrik Thorén Civilengineer, Hydraulic Specialist

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

Content slide

Bella Sky Hotel

Rambøll Head Office

Femer Bælt Tunnel

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

!  Manipulation of DTM !  Post Process flood results

Agenda

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

Manipulation of DTM

Content slide, two columns with image

Before After DTM with shape file

Principal solution - I

Input Shapes Clipper Inside

Clipper Outside Input Raster

Clipper Transformer

RasterCellReplacer

Change value to 5

RasterCellValueCalcualtor

Operator +

5

5

5

DTM + 5

Principal solution - II

RasterMosaicker

RasterCellValueCalcualtor

Operator +

Clipper Outside

DTM + 5

FME solution

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

Content slide, with top bar image

Principal solution - I

Raster Flood Result

Shape file with flood islands

Excel file with statistics

Input Output

Principal solution - II

Raster Flood Result

RasterCellCoercer

RasterExtentsCoercer

- Data Extents

PointOnAreaOverlayer

- Count overlaps

- Create a list of the

flood depth in each

point

Count List

Principal solution - III

PointOnAreaOverlayer

Count List

PythonCaller + AttributeCreator

- Calculate the total flooded area and

volume of the flooded water

Shape file

Excel file

FME solution - I

FME solution - II

!  Statistics in excel format that can be presented in diagrams

Results

0 500000

1000000 1500000 2000000 2500000 3000000

B_Å

1_M

Q21

00_2

6t_S

B_Å

1_H

Q21

00_2

6t_S

B_Å

1_M

Q21

00_1

0t_S

B_Å

1_H

Q21

00_1

0t_S

B_Å

1_M

Q21

00_1

0t_Ö

B_Å

1_H

Q21

00_1

0t_Ö

B_Å

1_H

Q21

00_2

6t_S

_P26

B_Å

2_M

Q21

00_2

6t_S

B_Å

2_H

Q21

00_2

6t_S

B_Å

2_M

Q21

00_1

0t_S

B_Å

2_H

Q21

00_1

0t_S

Are

a (

m2

) /

Vo

lym

(m

3)

Scenario

Översvämmad yta (m2) Volym av översvämmat vatten (m3)

Thank You!

!  Questions?

!  For more information: !  Henrik Thorén, hent@ramboll.com !  Rambøll

!  www.ramboll.com !  www.ramboll.com/worldwide

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