Abstract
The dispersion is mainly governed by wind field and depends on the planetary boundary layer (PBL) dynamics. Accurate representation of the meteorological weather fields would improve the dispersion assessments. In urban areas representation of wind around the obstacles is not possible for the pollution dispersion studies using Gaussian based modeling studies. It is widely accepted that computational fluid dynamics (CFD) tools would provide reasonably good solution to produce the wind fields around the complex structures and other land scale elements. By keeping in view of the requirement for the micro-scale dispersion, a commercial CFD model PANACHE with PANEPR developed by Fluidyn is implemented to study the micro-scale dispersion of air pollution over an urban setup at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam a coastal station in the east coast of India under stable atmospheric conditions. Meso-scale module of the PANACHE model is integrated with the data generated at the site by IGCAR under RRE (Round Robin Exercise) program to develop the flow fields. Using this flow fields, CFD model is integrated to study the micro-scale dispersion. Various pollution dispersion scenarios are developed using hypothetical emission inventory during stably stratified conditions to understand the micro-scale dispersion over different locations of coastal urban set up in the IGCAR region of Kalpakkam.
Highlights
The study of air pollution dispersion is pre-requisite for urbanization, industrial growth and expansion of coastal population [1,2]
Several in situ meteorological measurement stations, i.e. masts and micro-meteorological towers are in operation during the period of the study as a part of the RRE conducted by Indira Gandhi Centre for Atomic Research (IGCAR)
Micro-scale dispersion of air pollution over an urban setup in a coastal station in the east coast of India (IGCAR, Kalpakkam) has been studied using a commercial computational fluid dynamics (CFD) model PANACHE with PANEPR developed by Fluidyn
Summary
The study of air pollution dispersion is pre-requisite for urbanization, industrial growth and expansion of coastal population [1,2]. Excessive heating and wind conditions result in good mixing, where as nighttime due to strong stable conditions, the mixing is reduced and has a different signature of dispersion of pollutants; some times it may leads to the occurrence of catastrophic episodes. Due to this important reason, in the present study, the nighttime to early morning hours are considered to see the dispersion scenarios
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