Download - TEAM PURPLE 2010
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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
0.450.45
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 modelTriangular 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
BasinManhole
Sewer pipe flow
FLOOD AREA
Hydrological Model
Hydraulic Model
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Flood AnalysisProcess Flowchart
MIKE ZERO
DEM
MIKE 21Simulating 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
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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
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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!!