A multi-regime approach to parameterize the effects of noise barriers on near-road air quality
This paper presents the development and evaluation of a parameterized model capable of predicting near-road concentrations of inert species in the vicinity of a solid barrier using a multi-regime approach. Derived based on studying the flow structures and the underlying physics, the multi-regime approach describes 1) concentration profiles outside of the wake created by the barrier (referred to as the “far field” regime) by a standard Gaussian plume dispersion model with a vertically and horizontally shifted source, 2) the concentrations within the wake as nearly uniform (referred to as the “wake” regime), and 3) creates a third regime (referred to as the “transition” regime) to smoothly merge the far field concentration to the wake concentration. A high-fidelity Large-eddy simulation (LES) model is employed to create a wide range of conditions to generate robust empirical constants. The performance from this multi- regime model is evaluated against wind tunnel and field measurement data, which shows good agreement. An important feature of the approach is that the parameterization is developed entirely based on numerical experiments, and evaluated against independent datasets, i.e., datasets are not used for parameterization. In comparison, previous parameterization efforts typically developed and evaluated the model based on the same datasets. Therefore, the parameterization presented in this paper is potentially more robust.
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Supplemental Notes:
- This paper was sponsored by TRB committee ADC20 Standing Committee on Transportation and Air Quality. Alternate title: Multiregime Approach to Parameterize Effects of Noise Barriers on Near-Road Air Quality
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Steffens, Jonathan T
- Yuan, Chunli
- Zhang, K Max
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Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References;
- Pagination: 14p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Air pollution; Air quality; Measurement; Noise barriers; Roadside
- Subject Areas: Environment; Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 01624219
- Record Type: Publication
- Report/Paper Numbers: 17-03847
- Files: TRIS, TRB, ATRI
- Created Date: Jan 26 2017 5:04PM