Dispersion of Air Pollution & Penetration into the Local Environment

News Archive 2003

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DECEMBER

A DAPPLE Consortium Meeting was arranged for the middle of November 2003 at The University of Bristol to start confirming the arrangements for the main field campaign planned from 19th April to 28th May 2004. The meeting was successful; it reflected on the outcomes of the field campaign in Spring 2003 and looked ahead to the aims and objectives of the forthcoming field campaign. Initial plans were discussed and will be finalised over the coming months.

NOVEMBER

A DAPPLE Consortium Meeting has been arranged for the middle of November 2003 at The University of Bristol to start confirming the arrangements for the main field campaign planned from 19th April to 28th May 2004. The meeting will reflect on the outcomes of the field campaign in Spring 2003 and look ahead to the aims and objectives of the forthcoming field campaign.

OCTOBER

DAPPLE was represented at an air pollution seminar on Wednesday 1st October 2003 at Westminster Council House, Marylebone Road, NW1. This meeting was open to the public and workers interested in the local air quality. The seminar consisted of four presentations, available upon request from WCC, these were:

AUGUST 3rd

* Preparations are underway for the 1st October Open Day at Westminster City Council, which will include talks and poster presentations.

JULY 15th

* The PAG and ASG meetings were successfully held at Surrey University. Individuals attending the PAG meeting got first glimpses of what DAPPLE had achieved in the first field campaign and its potential for further fieldwork in the second field campaign (now planned for Spring 2004). The PAG meeting was followed by the ASG meeting, where discussions followed on from the previous meeting concerning user needs that need to be addressed by DAPPLE.

JULY 11th

* PAG/ASG meeting due this Monday, 14/7/03

MAY 30th

* Site first launched in graphical form

MAY20th

* An initial note is available here (520kB) describing nominal 10 second "puff" releases performed in the EnFlo wind tunnel at UniS (Adobe Acrobat Reader or similar required). Work has continued with further, shorter, releases, ensemble averaged over hundreds of relisations.

* We have produced a Panorama (approx 1.5MB) for those unfamiliar with the intersection at the heart of the DAPPLE field site (Apple QuickTime required). We hope to add further views to give our visitors a clear idea of the scale and nature of the site.

* The Leeds Institute of Traffic Studies van is expected on-site this evening, and will be making measurements 21, 22nd May, recharging at UniS overnight.

MAY 16th

* First Field Tracer Release complete! Yesterday, (15/5/03) Bristol University's team performed a staggered release of harmless SF6 (Sulphur Hexaflouride) and PMCH (something very long!) tracers, assisted by assorted DAPPLE volunteers manning 10 sampling points, under the direction of the Field Campaign Coordinator, Samantha Arnold.

The release was made at 17:00 from York St, having waited all day for suitable weather conditions -a steady SW breeze. The release comprised approx 20g of SF6, released from 17:00 to 17:30, and a yet-to-be-calculated amount of PMCH, released from 17:15 to 17:30.

Sampling was performed at 1.5m above ground at 10 sites in an arc downwind of the release. Each sampling point collected 10 3-minute samples in sequence, with sampling being started at the moment of release. Inspection of the sampling equipment after the release showed that 92 of the 100 sample bags filled correctly.

Analysis of the samples will now take up to 5 weeks, but is sensitive to levels of the order of 1 part in 10,000,000,000,000,000 !

MAY 6th

* Leeds ITS van is travelling South today! Should be on-site for measurements this evening, and back for the morning rush hour on Wednesday 7/5. The van will then remain based at Surrey for the rest of the campaign, to take best advantage of available weather conditions.

MAY 2nd

* First results of multiple averaged puff releases:
York Rd -> Marylebone Rd 1.2s arrival delay, 2s rise time (at wind tunnel model scale)

More locations to be tested shortly, once we've established the minimum number of realisations to yield reliable values...

MAY 1st

* First puff release in EnFlo tunnel:- very rough initial numbers: Release at York Rd, measuring at main intersection:
Time to arrive approx 2s, time to decay approx 2s (at wind tunnel model scale)

* Also, on the Leeds ITS van front, we now have two (2!) sets of two charging sockets at UniS, thanks to some unexpected hyper-efficency!

APRIL 29th

* Field measurements have commenced! (w/c 28/4)

* Parking and power will be available at UniS for the Leeds Institute of Traffic Studies van, commencing Tuesday 6th May. This will allow the van to remain near the field site for the duration of the campaign, enabling the best use to be made of the available weather conditions.

* Wind tunnel equipment is almost complete to perform a simulated "puff" release prior to the full scale harmless tracer release. If completed in time, this data will help the field team position their monitoring points most effectively

* A preferred design for the new DAPPLE logo has been selected by ballot- that means we will shortly have a properly designed home page!


Archived news for 2004 can be found here.
Archived news for 2005 can be found here.
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