Real-time modelling of surface water flooding hazard and impact at countrywide scales
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1 Real-time modelling of surface water flooding hazard and impact at countrywide scales Steven Cole 1, Robert Moore 1, Paul Mattingley 1,Timothy Aldridge 2, Jon Millard 3,4 and Stefan Laeger 5 BHS National Symposium, University of Birmingham, 4 September
2 What is the Natural Hazards Partnership? Real-time Hazard Impact Model: Surface Water Flooding
3 Surface Water Flooding Surface Water Flooding (SWF) Major hazard with ~4 million properties at risk in England alone (EA, 2009) Summer 2007 floods 3 billion insurance payouts 55,000 properties flooded, ~36,000 due to SWF National infrastructure impacts 140,000 homes without clean water for 17 days 42,000 homes without power for 24 hours 10,000 people trapped on M5 Pitt Review commissioned Flood Forecasting Centre & Scottish Flood Forecasting Service formed
4 Surface Water Flooding Alerts: Approaches Rainfall-based alerts (current practice) Uses national rainfall-thresholds and broad soil moisture & urban effects Supports FFC Surface Water Decision Support Tool (Spreadsheet) Feeds in to FFC daily Flood Guidance Statement
5 Surface Water Flooding Alerts: Approaches Rainfall-based alerts (current practice) Uses national rainfall-thresholds and broad soil moisture & urban effects Supports FFC Surface Water Decision Support Tool (Spreadsheet) Feeds in to FFC daily Flood Guidance Statement Localised runoff thresholds (ongoing NHP developments) G2G distributed hydrological model converts rainfall to runoff G2G soil moisture conditions influence surface runoff production Scientific advances to improve national SWF hazard footprint G2G already used by FFC & SFFS so quick win potential New impact assessments (ongoing NHP developments) Use existing national datasets on property, infrastructure & population Case studies show potential for real-time hazard and impact forecasts
6 Grid-to-Grid (G2G) Distributed Model Soil moisture River flow Uses spatial datasets on terrain, soil/geology, land-cover Responds to spatial variation of rainfall input Used operationally across Britain at a 1km 15 min resolution Moore et al., IAHS Publ. 305 (2006) Price et al.; Cranston & Tavendale, Water Management (2012)
7 Factors affecting G2G runoff production Soil properties (for each HOST class) Urban/Suburban coverage Increase runoff (by decreasing soil depth) Soil Moisture Deficit (modelled) G2G Runoff Production Terrain/slope Steep slopes Shallow storage Shallow slopes Deep storage Gridded rainfall
8 G2G runoff alerts for surface flooding National rainfall-thresholds Based on Extreme Rainfall Alert method Uses FEH 30 year return period rainfalls averaged across 8 UK cities 1h radar rainfall totals >30mm >25mm G2G runoff production affected by: Rainfall amount plus Urban/suburban coverage Soil and geology properties Antecedent soil moisture conditions Prototype runoff threshold exceedances seem more targeted 1h runoff totals >8.5mm >7mm
9 SWF Case Study: 2-3 August August 2011 event FFC identified event with SWF impacts Peak radar accumulations of 40-60mm near York and Goole Reports of flooding at Thorne and York Goole badly affected including a residential home End-to-end case study to produce first SWF impact maps Note uses radar-rainfall and not forecasts Good first step guiding future development
10 SWF Case Study: 2-3 August 2011 Evolution of rainfall and surface-runoff accumulation maps Reported flood locations highlighted (FFC data) 15:00 16:00 York 17:00 18:00 1h rainfall totals >30mm >25mm Goole Goole Thorne York 1h runoff totals >8.5mm >7mm Goole Goole Thorne
11 SWF Case Study: rainfall vs surface-runoff 1h rainfall totals >30mm >25mm Rainfall (15 min, mm) 17:00 18:00 Thorne Thorne ERA Threshold Crossed ERA Threshold Not Crossed 1h runoff totals >8.5mm >7mm G2G runoff (15 min, mm) Thorne Thorne G2G Threshold Not Crossed 17:00 Heavy rain Low runoff % Pixel becomes saturated G2G Threshold Crossed 18:00 Moderate rain High runoff % Saturated G2G SMD (15 min, mm) SMD recovers
12 Example SWF impact output Impact Summary over time-frame of event
13 SWF Impact Modelling approach Ensemble rainfall forecasts (MO) National Receptor Dataset (EA) Other impact datasets Hazard Footprint Based on G2G surface runoff Impact Library (HSL) Hazard Impact Outputs Updated Flood Map for Surface Water UFMfSW (EA) National Population Database (HSL)
14 Impact Library Pre-calculate 1km Impact Library, using ufmfsw scenarios (e.g. 30yr, 1hr storm) and national datasets on population and receptors Criteria based on defined set of flood impacts 1. Danger to life 2. Damage to Buildings 3. Disruption of Key Sites and Infrastructure 4. Disruption of Transport 5. Disruption of Communities Evidence-based approach for impact assessment methodology 1km impact output and regional summary Link impact and likelihood to Flood Risk Matrix used by EA/FFC
15 Link G2G Hazard Footprint to impact Calculate G2G surface runoff accumulations Exceeds UFMfSW net rainfall scenario? Use Impact Library to assess impact
16 Probabilistic impact products Proof-of-concept hazard impact forecast system: Ensemble of SWF hazard footprint (G2G) Impact Library for each UFMfSW scenario Regional Summary of Forecast Flood Risk Regional impact summary for each ensemble member Summarise for time, space & uncertainty Reporting by County/Authority Combine impact and likelihood to calculate risk
17 Minimal Minor Significant Severe Minimal Minor Significant Severe Minimal Minor Significant Severe Minimal Minor Significant Severe Case study Proof-of-concept outputs (26-28 June 2012) Compared to actual risk as assessed by FFC Impact forecasts show promise Darlington Durham Northumberland Tyne and Wear Forecast Origin Region Post Event Forecast Actual Impact Level Likelihood risk Northumberland Significant Medium Amber Tyne and Wear Severe Medium Amber
18 Summary and Next Steps Proof-of-concept NHP Hazard Impact Model for SWF shows potential for nationwide application Supported by positive feedback from SEPA of similar system trialled during Commonwealth Games (earlier talk 2-9S) Targeted improvements to methodology Runoff-production, impact datasets, impact calculations,... Explore closer links to high-resolution inundation modelling Further case studies and validation Historical SWF footprint and impact data scarce Presentation of outputs key for end-users Near-operational end-to-end trial by FFC in 2015
Real-time hazard impact modelling for surface water flooding: some UK developments
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