PHOTOCHEMISTRY IN A CONVECTIVE LAYER AND IN VALLEYS

Pollution in alpine valleys is induced by heavy road traffic. Closure of the Mont Blanc tunnel was used as an opportunity to compare atmosphere quality with or without associated traffic. First a numerical simulation above flat ground is run as a process study combining flow dynamics (ARPS 4.5 code) and photochemistry (TRANSCHIM-MOCA code). Thanks to a soil model, convection develops from ground heating by sun radiation. Two cases are run, (1) with no external wind, (2) with steady external wind. O3 and HNO3 continuously increase in case (1) because of insufficient fresh air renewal, when more directly linked to solar radiation intensity in case (2). In the evening, COV concentrate in the upper parts of convective cells. Secondly, numerical simulations of atmosphere dynamics in the real orography of Chamonix valley show complex patterns. In the morning and at dusk, slope winds superimpose to convective mixing and may influence the evolution of pollutant concentrations. For the covering abstract see ITRD E122175.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/3901351590
• Corporate Authors:

  GRAZ UNIVERSITY OF TECHNOLOGY

  INFFELDGASSE 25
  GRAZ,   Austria  A-8010
• Authors:
  • CHOLLET, J P
  • BRULFERT, G
• Publication Date: 2002

Language

• English

Media Info

• Features: References;
• Pagination: p. 309-14
• Serial:
  • PROCEEDINGS OF 11TH INTERNATIONAL SYMPOSIUM, TRANSPORT AND AIR POLLUTION, HELD GRAZ UNIVERSITY OF TECHNOLOGY, AUSTRIA, 19-21 JULY 2002
  • Volume: II
  • Publisher: GRAZ UNIVERSITY OF TECHNOLOGY

Subject/Index Terms

• TRT Terms: Air; Air pollution; Chemical analysis; Conferences; Flow; Fluid dynamics; Luminous intensity; Passes (Mountains); Simulation; Traffic
• ITRD Terms: 6714: Air; 2452: Air pollution; 7163: Chemical analysis; 8525: Conference; 5430: Flow (fluid); 505: Light intensity; 2717: Mountain pass; 9103: Simulation; 755: Traffic
• Subject Areas: Operations and Traffic Management;

Filing Info

• Accession Number: 00981208
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 3-901351-59-0
• Files: ITRD
• Created Date: Nov 3 2004 12:00AM