1D, 2D Integrated Flood Risk Mapping (Incheon-gyo Catchment) Team RED Seongjoon BYEON Myeongsoo HAM Michele ROMANO K. Shobha YADAV Masahiko TERAZONO ADVISER : Gyewoon CHOI

HYDROASIA TEAM-RED Michele, Joon, Shobha, Ham, Masahiko

Face-to-Face Week The first face-to-face meeting of the participants started on 20th August-2007 Our team had preliminary presentation for the work progress on 20 August Started to work on our further plan for this week and comments from preliminary presentation Making good experiences!!!!

CONTENTS  OBJECTIVES OF STUDY  RAINFALL ANALYSIS  URBAN DRAINAGE & MIKEFLOOD MODEL SETUP USING DIFFERENT RUNOFF COEFFICIENT  ANALYZING RESULTS  RISK ANALYSIS  CONCLUSION

OBJECTIVES OF STUDY  Main purpose –Runoff analysis based on rainfall data and DEM –Simulation of Incheon Gyo watershed for the flood Aug 1997 –Investigating the way to apply runoff coefficient –Comparison with results simulated with different parameters and model –Mapping Flood Risk 1D-2D –Comparison with Real Flood –Risk analysis

FLOW CHART OF OVERALL FRAMEWORK MIKE FLOOD Set up Coupling Preprocessing for MOUSE Run Model Check the result and evaluation Set up Validation MIKE21 ModelMOUSE Model Set up Validation Preparation GIS Rainfall Analysis Evaluation of the Flood risk

INCHEON INTENSITY FORMULA VS GUMBELL Gumbell Formula Monomial Precipitation Formula Incheon University Intensity Formula

GUMBELL Maximum of observed raifall data based upon the duration (1961~2004) Intensity

COMPARISON INTENSITY

1D FLOOD MAP

INTRODUCTION-MIKE FLOOD Rainfall Runoff Surface Runoff Overflow Re-inflow after flood Flow-capacity excess Sewage/Rainfall water

INTRODUCTION-MIKE FLOOD

Catchment boundary Gajwa-WWTP Cityhall Ganseok st. Juan st. Incheon gyo Pump Station Flooded area REPORTED FLOODING AREAS

Real Event 2D- 100% Runoff - Time step 1 Real Event 2D- 75.8% Runoff - Time step 1 (Tr=20 years-Duration=50min) 100% Runoff Time step 1 Real Event 1D - Runoff=f(manhole area) Time step 1 RESULTS OF MIKE FLOOD(1)

Real Event 2D - 100% Runoff - Time step 2 Real Event 2D % Runoff - Time step 2 (Tr=20 years-Duration=50min) 100% Runoff Time step 2 Real Event - 1D Runoff=f(manhole area) Time step 2 RESULTS OF MIKE FLOOD(2)

RISK ANALYSIS Risk=(Probability of an accident)*(Losses per accident) Probability of an accident Factors Considered Losses per accident Factors Considered A1) SlopeB1) Building A2) Impervious areasB2) Density of Population A3) Land useB3) Population Increase Forecast A4) Velocity of the flow in the Flooded Area

SLOPE MAP

IMPERVIOUS AREAS MAP & LAND USE TABLE LocationResidenceMarketIndustrialGreenTotal Incheon gyo Covered Openchannel Left ,183.6 Right Seoknam Canal Total ,091.7

VELOCITY MAP

BUILDING MAP

POPULATION INCREASE 2016 Formula interesse composto Where

DENSITY OF POPULATION MAP

DECISION MAKING

BUILDING MAP

CONCLUSIONS  Experience in Incheon was …an experience:)  The advantage mapping with 2D surface runoff modeling could be found as following with nicely matching of the reported area –The terrain characteristic can be considered –The lag due to the puddle, discontinuity can be considered –The magnification of result can be prevented with distribution of flooded water to another manhole  A simple Risk analysis can be arranged

Lets take pride in being TEAM RED !!!