HydroAsia Final Presentation. 2010 team Purple Reducing Flood Damage by Increasing Green Area

TEAM PURPLE 2010HydroAsia

Final Presentation

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PURPLE TEAM CONCEPT

Reducing Flood Damage by Increasing Green Area

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subcatchments

Runoff coefficient:Between 0.7 and 0.8

Areaalmost totally

impervious0.75

0.75

0.80

0.74 – 0.8

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subcatchments

Runoff coefficient:Between 0.3 and 0.8

0.45

0.45

0.45

0.80

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Increase of green areas (Bioretention cells,vegetation), with depression storage

Increases well-being and quality of life of the city's inhabitants, environmentally friendly

Possibility to use low impact development also, new technologies.

Stormwater Management solutions for runoff control

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Green parking design : utilizing alternative pavers in overflow parking areas◦ Depression storage 1.5mm◦ Capillary suction: 10 mm◦ Manning’s N: 0;03

Permeable pavement : allows stormwater to drain through the porous surface to a stone reservoir underneath. The reservoir temporarily stores surface runoff.

Stormwater Management solutions for high urbanized areas

10% of total area =40 000 m3

storage

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Overview-Incheon Gyo Watershed-Method

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Incheon Gyo Watershed

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ArcGIS: catchment model

Triangular Irregular Network

•Contour•Manholes

Raster

Building and Road Layers

Digital Elevation Model

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Incheon Gyo DEM

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Rainfall runoff process for urban catchment

Water level B.C

Hydrograph based on runoff

Rainfall ImperviousnessCatchment

area

Surface

• Water level• Discharge: Q

DEM→Roads

Roads+Storage

Routing

Sewage network

• Water level• Discharge Q

BasinManhol

e

Sewer pipe flow

FLOOD AREA

Hydrological Model

Hydraulic Model

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Flood AnalysisProcess Flowchart

MIKE ZERO

DEM

MIKE 21MIKE 21

Simulating the surface flow Simulating the sewer network flow

MOUSE

Analysis Results

Results

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Preparation of Analysis

Sewer Network Checking

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Sewer Network Problems(1)

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Sewer Network Problems(1)

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Sewer Network Problems(2)(too Low Elevation of Manhole )

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Sewer Network Problems(2)

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BackgroundFlood in Incheon Gyo 1997

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0

10

20

30

40

50

60

70

80

Rainfall Intensity

Rainfall Intensity

Rain

fall

Inte

nsit

y [m

m/h

]

Time

Outline of 1997Flood in Incheon Gyo

:Flood Area

Impervious Area Distribution and Flood Area Distribution

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Simulations-Current Conditions-Landuse modifications

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MIKE21: ◦ Manning Number: 32 →(at green area: 25)◦ Rainfall: Aug. 4 1977 4:00am-6:00pm for all

Catchments◦ Tidal Data

MOUSE:◦ Tidal Data at 3 Nodes(Outlets)◦ Rainfall: Aug. 4 1997 4:00am-6:00pm for all

Catchments◦ Runoff Coefficient: 75%-80% (at Green Area: 45%)

Simulation Conditions

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Buildings and Roads Distribution

•Total Simulation Area: 33.95km2

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Simulation Result1(Current)• Current Landuse • Manning No.: 32• Total Simulation Area: 33.95km2

: Flood Areas

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Ideas of Landuse Changing

: Green Area

Total “green area increase”: 3km2

Total Simulation Area: 33.95km2

: new urban environment technologies (pavements, roads)

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Boundary Condition after Landuse Changing

MIKE21: ◦ Manning Number: Green Area: 25 Other Area: 32◦ Rainfall: Aug. 4 1977 4:00am-6:00pm for all Catchments◦ Tidal Data

MOUSE:◦ Tidal Data at 3 Nodes(outlets)◦ Rainfall: Aug. 4 1997 4:00am-6:00pm for all Catchments◦ Runoff Coefficient: Green Area: 45% Other Area: 75%-80%

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Simulation Result Video (existing conditions)

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Simulation Result Video (Modified)

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Simulation Result2(Proposal)

: Flood Areas

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Comparison

Flood Areas (Before Changing Landuse)

Flood Areas (After Changing Landuse)

: No Green Area added: flood area: 43.7ha (486cells)

:With 336ha Green Area added:Flood area: 11.8ha (132cells)

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What we achieved◦ Built DEM from contours and manholes using ArcGIS◦ Modeling Incheon catchment with Mike 21 ◦ Simulate sewer flow by MOUSE with many scenarios.◦ Combine 2 DHI model: MOUSE and Mike 21 together.◦ Studied the idea of increasing Green Area to reduce flood in Incheon.

What we got◦ Good chance to study together with many students from different

countries. ◦ Improved teamwork skill. ◦ Understanding the softwares: ArcGIS, Mike 21, Mike Flood, MOUSE…

For their help, special thanks to◦ Professor Philippe Gourbesville - University of Nice Sophia Antipolis ◦ Professor Shie Yui Liong - National University of Singapore◦ Professor Gye-Woom Choi - University of Incheon◦ Anne Gaedeke, University BTU Cottbus

Conclusion

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Enjoy!

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Thank You for Your Attention!!