TEAM PURPLE 2010

TEAM PURPLE 2010HydroAsia

Final Presentation

2010 team Purple2010 team Purple

PURPLE TEAM CONCEPT

Reducing Flood Damage by Increasing Green Area


subcatchments

Runoff coefficient:Between 0.7 and 0.8

Areaalmost totally

impervious0.75

0.75

0.80

0.74 – 0.8


subcatchments

Runoff coefficient:Between 0.3 and 0.8

0.450.45

0.45

0.80


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


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


Overview-Incheon Gyo Watershed-Method


Incheon Gyo Watershed


ArcGIS: catchment modelTriangular Irregular Network

•Contour•Manholes

Raster

Building and Road Layers

Digital Elevation Model


Incheon Gyo DEM


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

BasinManhole

Sewer pipe flow

FLOOD AREA

Hydrological Model

Hydraulic Model


Flood AnalysisProcess Flowchart

MIKE ZERO

DEM

MIKE 21Simulating the surface flow Simulating the sewer network flow

MOUSE

Analysis Results

Results


Preparation of Analysis

Sewer Network Checking

2010 team Purple2010 team Purple Here!

Sewer Network Problems(1)


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


BackgroundFlood in Incheon Gyo 1997


0

10

20

30

40

50

60

70

80

Rainfall Intensity

Rainfall Intensity

Rain

fall

Inte

nsity

[mm

/h]

Time

Outline of 1997Flood in Incheon Gyo

:Flood Area

Impervious Area Distribution and Flood Area Distribution


Simulations-Current Conditions-Landuse modifications


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


Buildings and Roads Distribution

•Total Simulation Area: 33.95km2


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

: Flood Areas


Ideas of Landuse Changing

: Green Area

Total “green area increase”: 3km2

Total Simulation Area: 33.95km2

: new urban environment technologies (pavements, roads)


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%


Simulation Result Video (existing conditions)


Simulation Result Video (Modified)


Simulation Result2(Proposal)

: Flood Areas


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)


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


Enjoy!


Thank You for Your Attention!!

TEAM PURPLE 2010

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