1. Wind and Weather Data and Preliminary Results

2. Outline Motivations and Objectives What has been done?
Street level wind direction vs. synoptic wind direction
Conclusion &Future Work

3. 1. Motivations Objectives:
How does the horizontal transport compares with the vertical mixing?
How do they relate with the synoptic conditions?
Objectives:
How does the wind direction at the street level relate to the synoptic wind direction?
How does the wind speed at the street level relate to the synoptic wind speed?

4. 2. What has been done?
Sonic anemometer measurements at 6 locations at the street level + 2 reference wind speed measurements (AWS + sonic).
Complete data check + preliminary analysis for Site 1, Site 2, Site 5 (basement), reference sonic (roof) and reference AWS (roof).
data are available as 10min averages on the DAPPLE web site
Partial data check for Site 4 (lower and upper) and Site 5 (roof) (Leeds).

6. 3. Street level wind direction vs. synoptic wind direction

7. Synoptic conditions - AWS, 27/05/2003 to 21/05/2003-
Pdf of Synoptic Wind direction
Pdf of velocity magnitudes θ
x, U
y, V ⊙
z, W θ

8. Synoptic Wind Regime Definition
Regime C (SSW wind)
45 <angle<90
Regime B (WSW wind)
0 <angle<+45
Regime A (WNW wind)
-45 <angle<0

9. Synoptic Wind Regimes per day
Regime A (WNW)
06/05/2003
08/05/2003
13/05/2003
14/05/2003
Regime C (SSW)
29/04/2003
30/04/2003
01/05/2003
02/05/2003
07/05/2003
12/05/2003
15/05/2003
16/05/2003
19/05/2003
Transitional: A&C
09/05/2003
20/05/2003
21/05/2003
Pdf_wind direction
Pdf_wind direction
52 deg
-25 deg

10. Regime A: 06/05/2003 Site 4 WNW winds Pdf_direction_20 Hz data Site 1
-lower-
Site 1
Site 2
10 minutes averages

11. 02/05/2003: Regime C SWS winds Site 1 Site 2 Site 3
Pdf_direction
10 Hz data
10 minutes averages

12. Vortex street canyon? Gloucester street: site 4 lower
Pdf_wind magnitude
updraft
Characteristic for regime A+C

13. Street wind direction vs. Street wind direction (summary)
Regime A
Regime C ? ?
Channelling effect

14. 4. Conclusions & Future work
The horizontal transport seems to be dominated by the channelling effect.
The vertical transport might be dominated by street canyon vortex?
Street level wind speeds vs. synoptic wind speeds
To quantify the vertical transport (Gloucester Place + Marylebone) Leeds anemometers
To perform spectral analysis (wavelets analysis?)