Flood Damage Mitigation

Transcription

1 Flood Damage Mitigation Through Reservoir Operation Nov. 19, Kooyol Chong

2 Water Resources Operations Center(WROC) Flooding - Europe

3 Flooding - USA

4 Flooding - Vietnam

5 Flooding - Japan

6 Flooding - Korea

7 An Efficient Structural Solution Reservoir

8 Procedures of Flood Control Forecasted Rainfall Observed Flood Situation Runoff Analysis Flood Release Schedule Reservoir Simulation & Optimization Dissemination Flood Releasing Upstream of Dam Flood Releasing Field Office Video Conferencing WROC Downstream of Dam

9 Procedures of Flood Control Forecasted Rainfall Observed Flood Situation Runoff Analysis Flood Release Schedule 1. Advance Release Reservoir Simulation & Optimization 2. Combined Reservoir Operation Dissemination Flood Releasing

10 Flood Release Schedule 1. Advance Release Why? Advance Release Success? Advance Release When? Trigger for Initiating How much? Release Value Implemented 2. Combined Reservoir Operation Concept

11 Why? Advance Release Advance Release Exclusive Flood Storage Volume Exclusive Flood Storage Volume Additional Flood Storage Volume Advance Release

12 Advance Release Two extremes in Reservoir Operation Given no information on future Inflow To maintain separate reservoir volumes for each function Benefits of each function : Proportional to allocated volume Having perfect foresight of Inflow Each reservoir function make use of total reservoir volume Benefits of each function : Proportionally greater

13 Success? Advance Release (1) Advance Release (1) (2) (1) Advance Release (2) Failure to Refill

14 Failure? Advance Release (2) Advance Release Reservoir capacity Streamflow, Rel ease inflow Reservoir storage Storage Volume release Time With Advance Release Without Advance Release

15 When? Trigger for Initiating Advance Release 1. A forecasted peak inflow of a certain value 2. A forecasted event volume of a certain value 3. A particular quantile of the forecasted event, satisfying either trigger 1 or The forecasted event, causing a routed reservoir release greater than channel capacity, without advance release 5. A particular probability of release exceeding channel capacity without advance release

16 How much? Release Value Implemented Advance Release 25% exceed. 50% exceed. Best-Estimate Forecast Hydrograph Streamflow 75% exceedance Vfloodpool 95% exceedance 99% Exceedance Hydrograph 99% Exceedance Advance PMax Release robability Hydrograph Vrelease Volume Min Vrelease Min Vrelease Time

17 Combined Reservoir Operation Concept Dam 1 Hydrograph when release volume = 0 Dam 2

18 Combined Reservoir Operation Simulation Dam 1 Dam 2 (C1) FWL RWL FWL RWL (C2) (A1) (B1) (B2) (A2) Index Value

19 Combined Reservoir Operation Objective Function Optimization Where, H (l,t) : water level for each control point (each control point, l) Dur (l,t) :duration when water level exceeds risk water level for each control point RWL (i,t) : penalty for specified water level of each dam (each dam, i) Release (i,t) : penalty for released discharge for each dam

20 Thanks for your attention!