Open AccessA Visualization of Air Pollution Distribution over an Observed Area Surrounded by Mountains: A Computational Approach
Author(s) -
Udomsak Rakwongwan,
Piyanut Tangmanussukum,
Sanae Rujivan
Publication year - 2021
Publication title -
walailak journal of science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.146
H-Index - 15
eISSN - 2228-835X
pISSN - 1686-3933
DOI - 10.48048/wjst.2021.9805
Subject(s) - pollutant , air pollution , environmental science , pollution , advection , prevailing winds , airflow , urban area , chimney (locomotive) , meteorology , hydrology (agriculture) , geology , geography , inlet , geomorphology , chemistry , geotechnical engineering , engineering , mechanical engineering , organic chemistry , economy , economics , ecology , physics , biology , thermodynamics
We study the propagation of pollutants emitted from a single generator such as a factory chimney located between 2 mountains as well as its effects on an observed area such as a village or agricultural land. The problem is formulated as a system of partial differential equations, composed of Navier-Stokes equations and an advection-diffusion equation, and is solved by the finite element method. We visualize the propagation of the pollutants for several variants of the problem depending on the heights of the mountains and investigate their negative effects on the observed area by computing an average concentration of the pollutants over the observed area. We found that the observed area between the two mountains experienced a long-term negative effect compared with those located on flat land. This is because the mountain on the side, where the wind is blowing, obstructs the wind resulting in air recirculation. In contrast, the other mountain bounces some pollutants back to the observed area, preventing them from leaving the domain. The higher the mountains, the longer the time the pollutants remain in the observed area. If the heights of the mountains encircling the observed area are not equal, the residual remains in the area longer if the taller mountain is on the windward side.HIGHLIGHTSAir Visualization of air pollution between two mountainsAir pollution propagation modelingA system of partial differential equations for air pollution modeling with FEMGRAPHICAL ABSTRACT