dc.contributor.advisor |
Sugathapala AGT |
|
dc.contributor.advisor |
Manthilake MMID |
|
dc.contributor.advisor |
Lee SC |
|
dc.contributor.author |
Perera GBS |
|
dc.date.accessioned |
2022 |
|
dc.date.available |
2022 |
|
dc.date.issued |
2022 |
|
dc.identifier.citation |
Perera, G.B.S. (2021). Modeling of ground - level ozone formation in urban air - sheds of Sri Lanka [Doctoral dissertation, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/21190 |
|
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/21190 |
|
dc.description.abstract |
Physical phenomenon of the relation among ground-level ozone (O
3
), oxides of nitrogen
(NO
X
) and volatile organic compounds (VOC) is governed by complex nonlinear
photochemistry. To predict and control O
3
concentration, it is vital to know, how O
3
concentration changes in response to prescribed changes in source emissions of NO
X
and VOCs. In this research, a theoretical model was developed and validated for
ground-level O
3
formation in urban air-sheds of Sri Lanka. Hourly averaged weekly
results of ambient pollutant concentration data of eleven cities in the base years 2013,
2014 and 2015 in Sri Lanka was assessed and an urban air shed model was developed.
The model was calibrated using influential parameters measured. Then Colombo as the
most complicated urban air-shed in Sri Lanka was analyzed in detail. Model was
validated using measured 24-hour air quality monitoring data from the mobile air
quality monitoring stations at major traffic locations in Colombo in the year 2018 and
2019. Operational schedules of emission sources including train scheduled data,
working hours of the thermal power plants, and vehicle counts were conducted at
identified critical locations in Colombo to investigate the responsible sources. Gases
from the exhaust line of different types of vehicles was collected and analyzed using
Gas Chromatography Mass Spectroscopy (GCMS).
Results confirm that there exist two regimes of NO
X
-VOC-O
3
sensitivity as NO
x
sensitive
regime
and VOC-sensitive regime. The urban air-shed model is capable of
estimating the ground-level steady state ozone concentration (O
3ss
) and contributions
from each regime. The univariate linear regression model using predicted and observed
O
3
values confirmed that O
3ss
concentration was significantly correlated with the
predicted O
3
concentration. Analysis of urban air shed in Colombo also confirms the
predicted and observed O
3ss
concentration were significantly correlated. This research
provides a detailed understanding of photochemical degradation on formation of
ground-level O
3
in urban air-sheds of Sri Lanka and provides critical information for
the scientific community and decision-makers to formulate air pollution mitigation
policies. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
‘URBAN AIR-SHED’ |
en_US |
dc.subject |
PHOTOCHEMICAL DEGRADATION |
en_US |
dc.subject |
AIR POLLUTION MITIGATION INTERVENTIONS |
en_US |
dc.subject |
URBAN ENVIRONMENTS - Sri Lanka. |
en_US |
dc.subject |
GROUND - LEVEL OZONE |
en_US |
dc.subject |
MECHANICAL ENGINEERING – Dissertation |
en_US |
dc.title |
Modeling of ground - level ozone formation in urban air - sheds of Sri Lanka |
en_US |
dc.type |
Thesis-Abstract |
en_US |
dc.identifier.faculty |
Engineering |
en_US |
dc.identifier.degree |
Doctor of Philosophy |
en_US |
dc.identifier.department |
Department of Mechanical Engineering |
en_US |
dc.date.accept |
2022 |
|
dc.identifier.accno |
TH5062 |
en_US |