Abstract

The spatial distribution of pollutant concentrations in street canyons can be described with the newly developed Semi-Empirical Parameterized Street Canyon Model (SEP-SCAM). The model calculates the two-dimensional horizontal pollutant concentration distribution at any height above street level. It makes use of a combination of a plume and a box model as well as of diagnostic equations based on empirically derived techniques previously used in the OSPM, CPB and STREET models. The novel elements in SEP-SCAM are the introduction of new empirical algorithms that refine the aforementioned models, as well as the use of a parameterized approach for the extraction of the horizontal distribution of concentrations. These modifications and approaches were deduced from extensive analysis of experimental data and tests with the three-dimensional microscale model MIMO.

The SEP-SCAM is applied to specific street canyons in three European cities, London, Stockholm and Berlin using data from monitoring stations located in the considered domains. The results from these simulations show a good agreement with measured concentrations.

Keywords: Street canyon; Traffic emissions; Recirculation contribution; Plume equation; Box model; Intersection parameterization; Simplified empirical algorithms; Fast chemical reactions

Software availability

Name:

SEP-SCAM

Developer:

Papathanassiou Apostolos

Contact Address:

Aristotle University Thessaloniki, Laboratory of Heat Transfer and Environmental Engineering, Box 483, 54 124 Thessaloniki, Greece. Tel.: +30 2310 996060; fax: +30 2310 996012. E-mail: tolis@aix.meng.auth.gr

Minimum hardware requirements:

Intel Pentium III, 500 Mhz, 128 MB RAM

Software requirements:

Operating System Windows 2000, XP and Linux

Program Language:

Fortran 90–95

Further information:

Model Documentation System. http://air-climate.eionet.europa.eu/databases/MDS/index_html

Article Outline

Nomenclature

1. Major steps in the model development and evaluation

2. Introduction

3. Model methodology

3.1. The direct contribution

3.2. Recirculation contribution

3.3. Intersection parameterization

3.4. Turbulence parameterization

3.5. Distribution of pollutant's concentration across street canyon

3.6. Chemical processes in the street canyon

4. Case specification

5. Results and discussion

6. Conclusions

Acknowledgements

References