Extreme weather and the city

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'Extreme weather and the city' is one of the reasearch topics of TU Delft Climate Institute (climate.tudelft.nl). Dr Marie-claire ten Veldhuis expalined the relevance and importance of this theme during the kick-off of the institute on March 1st 2012.

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Extreme weather and the city

  1. 1. Extreme weatherand the city March 2, 2012 1 Marie-claire ten Veldhuis Climate Institute Kickoff Climate Institute Kickoff 1 1 March 2012
  2. 2. Climate Institute Kickoff 2
  3. 3. Climate Institute Kickoff 3
  4. 4. Extreme rainfall in cities Delft, August 2010March 2, 2012 Climate Institute Kickoff 4
  5. 5. Extreme rainfall in citiesWhat exactly happened? How much rainfall? Capacity problem? Blockage? Human error? Delft, August 2010March 2, 2012 Climate Institute Kickoff 5
  6. 6. Area effect Max precipitation P max Average rainfall area A1 Average rainfall area A2 Area size 1.200 1.000 0.800rainfall [L/T] 0.600 0.400 0.200 0.000 0 2 4 6 8 10 12 14 16 A [L2] Climate Institute Kickoff 6
  7. 7. Climate Institute Kickoff 7
  8. 8. Climate Institute Kickoff 8
  9. 9. Extreme rainfall in the city: we do not have representative data Climate Institute Kickoff 9
  10. 10. Urban hydrology:High building density: fast runoff processes Rainfall peaks are crucial ! Climate Institute Kickoff 10
  11. 11. Rainfall radar: spatial rainfall distribution Prevailing Prevailing wind (~ 19 mph) wind (~ 19 mph) (~ 30 km/h) (~ 30 km/h) 5 km resolution 1 km resolution(15 min accumulation for Crug-y-Gorllwyn, 07-04-2009 (2130), courtesy MetOffice)11 Climate Institute Kickoff
  12. 12. Urban hydrology:High building density fast runoff processes Rainfall peaks are crucial ! Oranjepolder: 490 ha Prinsenbeek: 100 ha Climate Institute Kickoff 12
  13. 13. Climate Institute Kickoff 13
  14. 14. Extreme weather in the city: we need more representativeand higher resolution data Climate Institute Kickoff 14
  15. 15. Urban hydrologyRequired data resolution << 1 km in space; < 5 min in time Oranjepolder: 490 ha Prinsenbeek: 100 ha Climate Institute Kickoff 15
  16. 16. RAINGAIN – high resolution rainfall data in cities Xband/Improved Cband radars in 4 Pilots: Rotterdam (NL) Leuven (B) Paris (F) London (UK) Climate Institute Kickoff 16
  17. 17. RAINGAIN – high resolution rainfall data in citieso WP1: Installation and testing of radars Lead: ParisTecho WP2: Fine-scale rainfall data acquisition and prediction Lead: KU Leuveno WP3:Urban pluvial flood modelling and prediction Lead: Imperial College of Londono WP4:Implementation of fine-scale rainfall data, flood modelling and prediction into urban water management practice Lead: TU Delft Climate Institute Kickoff 17
  18. 18. RAINGAIN – high resolution rainfall data in cities Will rainfall radar work in urban area with high rise? What spatial and time resolutions do we need ? Interaction between rainfall and runoff processes ? High resolution data on flood occurrence ? Use of social media in collection of rainfall and flood data ? Climate Institute Kickoff 18
  19. 19. Extreme weather and the cityNeed for an investigative eye Heavy rainfall: high resolution data Storm: wind speeds near high buildings? Heat: Effect of green spaces and building shades on temperature ? Long-term trends ? Climate in megacities ? Climate Institute Kickoff 19
  20. 20. Extreme weather incities: research environment for the future Climate Institute Kickoff 20

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