Polito, Martina
(2019)
Mean flow and turbulent exchange characteristics in real urban street canyons: the Lazzaretto case study.
[Laurea magistrale], Università di Bologna, Corso di Studio in
Fisica del sistema terra [LM-DM270], Documento full-text non disponibile
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Abstract
In the context of the European iSCAPE project (Improving the Smart Control of Air
Pollution in Europe) an experiment was set up in order to test photocatalytic coatings
effectiveness in reducing the concentration of pollutants. Further analysis on various aspects of the urban environment have been possible thanks to the experiment.
The measurements collected during the experimental field campaign have been used to
study the differences in the atmospheric phenomena due to the different morphology of
two street canyons. Data in time periods characterized by non-synoptic conditions have
been selected and then compared. The first part of the study is dedicated to the characterization of the mean flow. Subsequently, turbulent fluxes have been studied for both
canyons with the Eddy Covariance method, in order to appreciate the different behaviour
of the two canyons. In the end, the data collected have been elaborated with the Quadrant Analysis. This latest study has made possible to compare the results obtained by
the measurements in a real urban canopy layer with the results obtained in a controlled
environment and in a vegetated canopy layer.
The study has examined the intensity of sweep and ejection effects in an urban canopy
layer. The results show that in both canyons sweep effects prevail for the downwind case.
Instead, for an upwind flow the dominant effects are those of ejection. For parallel wind
directions the two canyons behave differently, due to their different morphology. Furthermore, the intensity of both effects is not as strong as in the perpendicular cases. The
behaviour of the fluctuations of CO2 and H2O concentration with respect to the temperature fluctuations has been compared to the results obtained in a vegetated canopy
layer. The analysis has shown that in the downwind and parallel cases the trends are
in agreement with the ones obtained in the vegetated environment. For an upwind flow,
however, the expected trends are not found.
Abstract
In the context of the European iSCAPE project (Improving the Smart Control of Air
Pollution in Europe) an experiment was set up in order to test photocatalytic coatings
effectiveness in reducing the concentration of pollutants. Further analysis on various aspects of the urban environment have been possible thanks to the experiment.
The measurements collected during the experimental field campaign have been used to
study the differences in the atmospheric phenomena due to the different morphology of
two street canyons. Data in time periods characterized by non-synoptic conditions have
been selected and then compared. The first part of the study is dedicated to the characterization of the mean flow. Subsequently, turbulent fluxes have been studied for both
canyons with the Eddy Covariance method, in order to appreciate the different behaviour
of the two canyons. In the end, the data collected have been elaborated with the Quadrant Analysis. This latest study has made possible to compare the results obtained by
the measurements in a real urban canopy layer with the results obtained in a controlled
environment and in a vegetated canopy layer.
The study has examined the intensity of sweep and ejection effects in an urban canopy
layer. The results show that in both canyons sweep effects prevail for the downwind case.
Instead, for an upwind flow the dominant effects are those of ejection. For parallel wind
directions the two canyons behave differently, due to their different morphology. Furthermore, the intensity of both effects is not as strong as in the perpendicular cases. The
behaviour of the fluctuations of CO2 and H2O concentration with respect to the temperature fluctuations has been compared to the results obtained in a vegetated canopy
layer. The analysis has shown that in the downwind and parallel cases the trends are
in agreement with the ones obtained in the vegetated environment. For an upwind flow,
however, the expected trends are not found.
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
Polito, Martina
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
urban canopy layer,street canyon,quadrant analysis,turbulence,eddy covariance,urban boundary layer,experimental campaign
Data di discussione della Tesi
21 Marzo 2019
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
Polito, Martina
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
urban canopy layer,street canyon,quadrant analysis,turbulence,eddy covariance,urban boundary layer,experimental campaign
Data di discussione della Tesi
21 Marzo 2019
URI
Gestione del documento: