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Flood Early Warning and Disaster Mitigation in Korea
Yang-soo Yoo
Korea I nstitute of Water and Environment
Snow in Winter Droughts
in Spring
Storms
in Summer
Flood Early Warning and Disaster Mitigation in Korea Yang-soo Yoo - - PowerPoint PPT Presentation
Flood Early Warning and Disaster Mitigation in Korea Yang-soo Yoo - - PowerPoint PPT Presentation
Flood Early Warning and Disaster Mitigation in Korea Yang-soo Yoo Korea I nstitute of Water and Environment WATER RELATED DISASTERS IN KOREA Snow in Winter Storms in Summer Droughts in Spring FLOODS IN A RECENT DECADE Collapse of Yeoncheon
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Flooded Paju City Collapse of Yeoncheon Dam
FLOODS IN A RECENT DECADE
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FLOODS IN A RECENT DECADE
Broken Railw ay Bridge by Typhoon Rusa Flooded Village by Typhoon Maemi
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FLOOD DAMAGES IN RURAL AREAS
I nundation of farmlands due to levee failures
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FLOOD DAMAGES IN URBAN AREAS
I nundation of roads and underground facilities due to insufficient drain capacities
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DAMAGES IN A RECENT DECADE DUE TO FLOOD
1,000 2,000 3,000 4,000 5,000 6,000 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 Year Property Loss in milion US Dollars 100 200 300 400 500 600 Life Loss Property Loss Life Loss
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FLOOD DISASTER MITIGATION
Recovery action for Flood Damage
- Local Communities
– Disaster Management
System based on Flood Hazard Maps
- Evacuation
- WROC under the KOWACO
- Flood Control by Dam Operation
Response against Flood Damage
- FCO under the MOCT
– Disseminate warning for
certain control points by water level
– Approval of dam operation
Flood Forecasting and Early Warning
Preparatory Action against Flood
- FCO: Flood Control Office
- MOCT: Ministry of Construction and Transportation
- WROC: Water Resources Operation Center
- KOWACO: Korea Water Resources Corporation
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PROCESS OF FLOOD FORECASTING AND CONTROL
Public
Warning dissemination Forecasting evaluation
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FLOOD FORECASTING FACILITIES
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RAINFALL FORECASTING
Gathering and Analyzing all the available weather information
Data from KMA, JMA, JWTC, etc. Gathering information: satellite, radar, AWS, etc.
I n-house rainfall forecasting for dam-basins
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FLOOD FORECASTING
Flood Analysis Models
Rainfall-Runoff Model
Storage function model (including SCS-CN method)
Channel Routing
Hydrologic and hydraulic models
Reservoir Routing
Scheduled release ROM Rigid rate and rigid quantity ROM Technical ROM, etc.
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FLOOD FORECASTING
Reservoir Routing
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FLOOD FORECASTING
Down-stream Channel Routing
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FLOOD CONTROL
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FLOOD RISK MAP
100 yr and Levee Breach at PT. 1 100 yr and Levee Breach at PT. 1
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FLOOD HAZARD MAP
Sample map with evacuation information Sample map with evacuation information
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DISASTER MANAGEMENT SYSTEM FOR LOCAL COMMUNITY
Receiving flood warning from FCO Receiving heavy storm warning from KMA I nundation analysis inside the levee
– insufficient drainage capacity – overflow or levee breach
Decision making on Evacuating people in the risky area Operation of stream gates & pumping facilities
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summary
- Flood Forecasting and Early Warning Systems
have been established for major river basins, and are being extended to smaller basins.
– More accurate rainfall forecasting with a proper leading time is
prerequisite for the reliability of early warning system
- Flood mapping has been conducted for major
rivers, and are still under going.
–
Flood map should be opened to the local communities and public to help them what to do in the real emergency situation
- Local community based flood disaster
management systems are being developed for effective preparedness against the flood risk.
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