Original scientific paper
A FAST MODEL FOR FLOW AND POLLUTANT DISPERSION AT THE NEIGHBOURHOOD SCALE
S. Di Sabatino
; Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni – 73100 Lecce, Italy
R. Buccolieri
; Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni – 73100 Lecce, Italy
P. Paradisi
; Istituto di Scienze dell'Atmosfera e del Clima (ISAC-CNR), Lecce Unit, Strada Provinciale Lecce-Monteroni Km 1,200 – 73100 Lecce, Italy
L. Palatella
; Istituto di Scienze dell'Atmosfera e del Clima (ISAC-CNR), Lecce Unit, Strada Provinciale Lecce-Monteroni Km 1,200 – 73100 Lecce, Italy
R. Corrado
; Dipartimento di Scienza dei Materiali, Università del Salento, Via Monteroni – 73100 Lecce, Italy, Istituto di Scienze dell'Atmosfera e del Clima (ISAC-CNR), Lecce Unit, Strada Provinciale Lecce-Monteroni Km 1,200 – 73100 Lecce, Italy
E. Solazzo
; School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT
Abstract
This paper deals with the development of a simple urban model for flow and dispersion in the urban canopy layer (UCL).
The flow module of the model calculates spatially-averaged wind profiles adopting a technique recently proposed in the literature,
which is based on a balance equation between the obstacle drag force and the local shear stress. Spatially-averaged wind profiles are
used as input for a newly proposed dispersion model which solves the advection-diffusion equation at neighbourhood scale. In the
model, the effects of the buildings within the UCL are taken into account by means of morphological parameters λf and λp (the
ratios of plan area and frontal area of buildings to the lot area).
Spatially-averaged mean concentrations output by the developed model are compared with numerical results obtained from the
computational fluid dynamics (CFD) model FLUENT. In particular, two configurations of constant height UCL have been considered, which refer to as λp = λf = 0.16 and λp = λf = 0.44. The originality of the study is that the dispersion model itself integrates the equations without explicitly resolving the flow around individual buildings but still accounts for their effects. The computational costs are much reduced which makes it suitable for the predictions of concentrations over the neighbourhood scale in an operational context.
Keywords
pollutant dispersion; urban canopy; morphological parameters; spatially-averaged wind profiles; neighbourhood scale
Hrčak ID:
64340
URI
Publication date:
12.12.2008.
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