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TEAM PURPLE 2010

TEAM PURPLE 2010. HydroAsia Final Presentation. PURPLE TEAM CONCEPT. Reducing Flood Damage by Increasing Green Area. 0.75. Runoff coefficient: Between 0.7 and 0.8. Area almost totally impervious. 0.75. 0.80. subcatchments. 0.74 – 0.8. Runoff coefficient: Between 0.3 and 0.8.

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TEAM PURPLE 2010

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  1. TEAM PURPLE 2010 HydroAsia Final Presentation

  2. PURPLE TEAM CONCEPT Reducing Flood Damage by Increasing Green Area

  3. 0.75 Runoff coefficient: Between 0.7 and 0.8 Area almosttotallyimpervious 0.75 0.80 subcatchments 0.74 – 0.8

  4. Runoff coefficient: Between 0.3 and 0.8 0.45 0.80 subcatchments 0.45 0.45

  5. Stormwater Management solutions for runoff control • Increase of green areas (Bioretentioncells,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.

  6. Stormwater Management solutions for high urbanized areas • 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. 10% of total area =40 000 m3 storage

  7. Overview -IncheonGyo Watershed -Method

  8. IncheonGyo Watershed

  9. ArcGIS: catchment model Triangular Irregular Network • Contour • Manholes Building and Road Layers Raster Digital Elevation Model

  10. IncheonGyo DEM

  11. Rainfall runoff process for urban catchment Hydrological Model Water level B.C Hydrograph based on runoff Catchment area Rainfall Imperviousness Hydraulic Model • Surface • Water level • Discharge: Q • Sewage network • Water level • Discharge Q DEM→Roads Manhole Basin Roads+Storage Routing Sewer pipe flow FLOOD AREA

  12. Results Flood AnalysisProcess Flowchart MIKE ZERO MIKE 21 MOUSE DEM Simulating the surface flow Simulating the sewer network flow Analysis Results

  13. Preparation of Analysis Sewer Network Checking

  14. Sewer Network Problems(1) Here!

  15. Sewer Network Problems(1)

  16. Sewer Network Problems(2) • (too Low Elevation of Manhole )

  17. Sewer Network Problems(2)

  18. Background Flood in IncheonGyo 1997

  19. Outline of 1997Flood in IncheonGyo Impervious Area Distribution and Flood Area Distribution :Flood Area

  20. Simulations -Current Conditions -Landuse modifications

  21. Simulation Conditions • 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%)

  22. Buildings and Roads Distribution • Total Simulation Area: 33.95km2

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

  24. Ideas of Landuse Changing : Green Area : new urban environment technologies (pavements, roads) Total “green area increase”: 3km2 Total Simulation Area: 33.95km2

  25. 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%

  26. Simulation Result Video (existing conditions)

  27. Simulation Result Video (Modified)

  28. Simulation Result2(Proposal) : Flood Areas

  29. Comparison : No Green Area added: flood area: 43.7ha (486cells) :With 336ha Green Area added: Flood area: 11.8ha (132cells) Flood Areas (Before Changing Landuse) Flood Areas (After Changing Landuse)

  30. Conclusion • 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 theidea 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 ShieYuiLiong - National University of Singapore • Professor Gye-WoomChoi - University of Incheon • Anne Gaedeke, University BTU Cottbus

  31. Enjoy!

  32. Thank You for Your Attention!!

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