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Use of raingauges network data in the short term prediction of urban pluvial floods

Use of raingauges network data in the short term prediction of urban pluvial floods. Methods of interpolation Cloud tracking Future Work : radar images & Flood modelling. Maureen Coat ENSTA Paristech. Rainfall Data. Database available : 88 Raingauge Stations

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Use of raingauges network data in the short term prediction of urban pluvial floods

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  1. Use of raingauges network data in the short termprediction of urban pluvial floods Methods of interpolation Cloud tracking Future Work : radar images & Flood modelling Maureen Coat ENSTA Paristech

  2. Rainfall Data • Databaseavailable : • 88 Raingauge Stations • Rainfall Rate every 30 min • Between 06/06/2006 and 19/10/2009

  3. 42 Raingauge stations in London :

  4. Code in SQL , easyselection of rainfall rate: • Atany date • Atany time • In London • Only a discrete set of data… • But rainfallis a continuousphenomenon • => Interpolation in regulargridcells

  5. Methods of interpolation • Manymethodsexist : • Inverse Distance Weight • Liska’sMethod • Polygone of Thiessen • … • The more efficient : KrigingMethod : • Designed for geophysical variables with a continuous distribution • Based on statistics • => Many data are required (Database) • WithMatlab

  6. Rainfall Rate Interpolation in London : (07/07/2009)

  7. Cloud Tracking ? • The 07/07/2009 : Flash flood in London • Victoria Station , Edgware road, and Paddington have been evacuated

  8. Rainfall Rate (mm/h) in London (07/07/2009) : Victoria Station Latitude : 51.5104444 Longitude : 0.1872222

  9. Rainfall Rate (mm/h) in London (07/07/2009) :

  10. Rainfall Rate (mm/h) in London (07/07/2009) :

  11. Rainfall Rate (mm/h) in London (07/07/2009) :

  12. Rainfall Rate (mm/h) in London (07/07/2009) :

  13. Future work :Comparisonwith radar images • Weather radar : • Estimated rainfall rates are derived indirectly from measurements of reflectivity • => subject to a combination of systematic and random errors • Conditional Merging ? Flood modelling : • Bemus (Belgrade Model of UrbanSewers) : • Rainfall Data is in Input • Influence of intensity • Influence of interpolation Method

  14. Thankyou for your attention Maureen Coat maureen.coat@ensta.fr

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