use of raingauges network data in the short term prediction of urban pluvial floods
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Use of raingauges network data in the short term prediction of
urban pluvial floodsI) Methods of interpolationII) Cloud trackingIII) Future Work : radar images & Flood modelling
Maureen Coat ENSTA Paristech
Database available : 88 Raingauge Stations Rainfall Rate every 30 min Between 06/06/2006 and 19/10/2009
Rainfall Data
42 Raingauge stations in London :
Code in SQL , easy selection of rainfall rate: At any date At any time In London
Only a discrete set of data… But rainfall is a continuous phenomenon => Interpolation in regular grid cells
Many methods exist : Inverse Distance Weight Liska’s Method Polygone of Thiessen …
The more efficient : Kriging Method : Designed for geophysical variables with a
continuous distribution Based on statistics => Many data are required (Database) With Matlab
Methods of interpolation
Rainfall Rate Interpolation in London : (07/07/2009)
The 07/07/2009 : Flash flood in London
Victoria Station , Edgware road, and Paddington have been evacuated
Cloud Tracking ?
Rainfall Rate (mm/h) in London (07/07/2009) :
Victoria Station Latitude : 51.5104444 Longitude : 0.1872222
Rainfall Rate (mm/h) in London (07/07/2009) :
Rainfall Rate (mm/h) in London (07/07/2009) :
Rainfall Rate (mm/h) in London (07/07/2009) :
Rainfall Rate (mm/h) in London (07/07/2009) :
Weather radar : Estimated rainfall rates are derived
indirectly from measurements of reflectivity => subject to a combination of systematic
and random errors Conditional Merging ?
Future work :Comparison with radar images
Bemus (Belgrade Model of Urban Sewers) : Rainfall Data is in Input
Influence of intensity Influence of interpolation Method
Flood modelling :