Meteorology

Investigation concentrates on how the horizontal advection compares with the vertical mixing in urban environments and how the flow within the streets relates to the more commonly measured synoptic (data from Met Office) or roof top conditions.

Initial results suggest that channelling effects dominate the horizontal advection in the streets, despite the proximity to the crossroads, for example:

• Site 5 in Gloucester Place is constrained in the E-W direction and flows are dominated by the winds channelled along the relatively narrow road (16m). The direction of flow at street level varied by effectively 180deg depending on whether there is a N or S component to the rooftop winds;
• For rooftop winds with a W component, Site 1on Marylebone Road to the W of the intersection is relatively unconstrained in all directions. The results for oblique W rooftop winds at this site show that the flow in the street is decomposed into its constituent components, the flow switching intermittently between Marylebone Rd and Gloucester Place;
• Site 2 on Marylebone Road, to the E of the intersection, for W winds is constrained to the N and S by the buildings and the flow remains channelled along Marylebone Rd (which is 36m wide).
• Site 4, which is approximately 40 metres from the intersection on Marylebone Rd, indicates that the in-street wind direction is approximately a reflection of rooftop wind direction when these winds are slightly off the Marylebone Rd axis

Meteorology Album

AWS Overlooking Salisbury Place 2	AWS Overlooking Salisbury Place	Central Res Area Opposite Bickenhall Mansions, Site 2
Central Res Area in Front of WCH Looking into GlPl, Site 1	Central Res Area in Front of WCH, Site 1	Downloading Met. Data
Full Lower Sonic, Site 5	Lower Sonic, Site 5	Sonic Closeup
Sonic	Sonics Site 5, Looking from Rooftop Down	Upper Sonic, Site 5
WCH Rooftop AWS 1	WCH Rooftop AWS 2	WCH Rooftop Met. Setup Closeup
WCH Rooftop Met. Setup	WCH Rooftop View of Intersection, Sites 1, 2 and 3_1