Observation of urban climate variability at local scale and comparison with human perception

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1 Observation of urban climate variability at local scale and comparison with human perception Noémie Gaudio 1, Sabrina Marchandise 2, Julien Le Bras 1, Aude Lemonsu 1, Sinda Haouès-Jouve 2, Dominique Legain 1, Julia Hidalgo 2, Benoit Tudoux 2 1 Météo-France / CNRS, Toulouse, France 2 Université Toulouse 2 Le Mirail / CNRS, Toulouse, France Toulouse France

2 Context and motivations Urban heat island at city scale Microclimate variability at neighbourhood scale 25 km Source: EPICEA Project Source: APUR 500 m Toulouse France 2

3 Context and motivations Urban heat island at city scale Microclimate variability at neighbourhood scale 25 km Source: EPICEA Project Source: APUR 500 m Interest for urban planning! Toulouse France 3

4 Context and motivations Urban microclimate at the neighbourhood scale Take into account human perception Physical approach: Experimental quantification of the spatial variability of urban microclimate at neighbourhood scale Sensitive approach: Consult people feeling about climatic comfort Toulouse France 4

5 Context and motivations Urban microclimate at the neighbourhood scale Take into account human perception Physical approach: Experimental quantification of the spatial variability of urban microclimate at neighbourhood scale Sensitive approach: Consult people feeling about climatic comfort EUREQUA project ( ): Interdisciplinary project dealing with environmental quality of the districts Toulouse France 5

6 Experimental design Interdisciplinary field experiment in Toulouse (France) Toulouse France 6

7 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² 150 m Toulouse France 7

8 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² Walking route (2km) Stop point 150 m Toulouse France 8

9 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² Sensitive approach: Social survey COMFORT uncomfortable comfortable TEMPERATURE cold hot WIND windy calm HUMIDITY humid dry SUNSHINE shaded sunny Toulouse France 9

10 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² Sensitive approach: Physical approach: Toulouse France 10 Temperature, radiative T, wind, humidity, UTCI (Universal Thermal Climate Index)

11 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² 150 m Timescale: 3 seasons = January, April, June 2014 x 3 consecutive days of mobile measurements x 3 hours: h Toulouse France 11

12 Experimental design Interdisciplinary field experiment in Toulouse (France) Focus on a district of 1 x 0.5km² Timescale: Two weather types (Hidalgo et al. 2015): winter group (3 days) summer group (5 days) 3 seasons = January, April, June 2014 x 3 consecutive days of mobile measurements x 3 hours: h Toulouse France 12

13 Emerging questions 2 weather types 8 days*3 hours 6 stop points/itinerary Toulouse France 13

14 Sensitive distinction between the stop points? Emerging questions Social surveys 2 weather types 8 days*3 hours 6 stop points/itinerary Link between climatic comfort and climatic parameters evaluation? Toulouse France 14

15 Sensitive distinction between the stop points? Emerging questions Objective differences between the stop points? Social surveys 2 weather types 8 days*3 hours 6 stop points/itinerary Meteorological measurements Link between climatic comfort and climatic parameters evaluation? Toulouse France 15

16 Sensitive distinction between the stop points? Emerging questions Objective differences between the stop points? Social surveys 2 weather types 8 days*3 hours 6 stop points/itinerary Meteorological measurements Link between climatic comfort and climatic parameters evaluation? Link between measurements and human perception Toulouse France 16

17 First results Meteorological measurements: ANOVAs Toulouse France

18 First results Meteorological measurements: ANOVAs Ex. 18/06/2014, 16h Temperature Significant differences between stop points UTCI Wind speed Relative humidity Toulouse France

19 First results Social surveys: qualitative approach Focus on climatic comfort Toulouse France

20 First results No significant link between climatic comfort and measured UTCI Comfort in Winter Comfort in Summer Human comfort evaluation +1-1 Human comfort evaluation +1-1 UTCI measured ( C) UTCI measured ( C) Toulouse France

21 First results Temperature well evaluated by inhabitants SURVEY Perceived temperature ( C) R²=0.87 Summer Winter 10h 16h 19h UTCI measured ( C) 40 Toulouse France

22 First results SEASONAL EFFECT Comfort other meteorological parameters Toulouse France

23 Winter Climatic discomfort Wet and windy conditions Comfort evaluation +1-1 First results HUMIDITY WIND 16h 16h Humidity evaluation Wind evaluation Social survey COMFORT uncomfortable comfortable WIND windy calm HUMIDITY humid dry SUNSHINE shaded sunny Toulouse France

24 Winter Climatic discomfort Wet and windy conditions Comfort evaluation +1-1 First results HUMIDITY WIND 16h 16h Humidity evaluation Wind evaluation Summer Climatic comfort Dry and calm conditions Comfort evaluation +1-1 HUMIDITY WIND SUNSHINE 16h 16h 16h Humidity evaluation Wind evaluation Sunshine evaluation Toulouse France

25 Conclusion Large database of meteorological parameters and human perception of climatic comfort and parameters First results on the analysis of sensitive and physical approaches In progress real cross-analysis of the sensitive and physical approaches Toulouse France

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