TXLINE: A Computer Model for Estimating Pollutant Concentrations Downwind of a Roadway

Bullin, J. A.; Rodden, J. B.; Messina, A. D.

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TXLINE: A Computer Model for Estimating Pollutant Concentrations Downwind of a Roadway

1983-03-15
By Bullin, J. A. ; Rodden, J. B. ; Messina, A. D.

File Language:

English

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Creators:

Bullin, J. A. ; Rodden, J. B. ; Messina, A. D.
Corporate Creators:

Texas Transportation Institute. Texas A&M University
Corporate Contributors:

Texas State Department of Highways and Public Transportation ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:

Air Quality Carbon Monoxide Computer Models Data Analysis Guidelines Modelling Carbon Monoxide Pollutants Roads SF6 State Of The Art Tracer Gas
Publication/ Report Number:

FHWA/TX-83/23+283-l
Resource Type:

Tech Report
Geographical Coverage:

Texas ; United States
Edition:

Interim: March, 1980 to September, 1982
Corporate Publisher:

Texas Transportation Institute. Texas A&M University
Abstract:

A state-of-the-art computer model called TXLINE (Texas Line Source Dispersion Model) was developed to predict pollution concentrations near roadways. The model has a strong theoretical foundation, based on non-Fickian, gradient transport diffusion theory. The model does not assume constant wind speed and eddy diffusivity as is usually the case with roost roadway pollutant dispersion models. A theoretically based treatment of non-perpendicular winds is also included in TXLINE, and resulted in a major improvement over its predecessor, TRAPS-IIM. By comparing the concentration predictions of the initial form of the TXLINE Model to experimental data, it was found that the model overpredicted concentrations when the wind speed was low. A low wind speed correction factor was included in the final version of the model to cure this problem. During the development of the model, a method of measuring atmospheric stability was also investigated, and could perhaps be included in a future version of the model. The final TXLINE Model was compared to several other current dispersion models using several comprehensive data bases and was shown to either surpass or equal the performance of the other models in nearly every case.
Format:

PDF
Funding:

2-8-80-283
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:20244c8d996dd4923936ace62e6168e2440f885f35a9ebd7d66799d9efeebd19dc8d03f5d83abd7786d1de9f47c5b119f780efa1cf648f665362f2a24609b607
Download URL:

https://rosap.ntl.bts.gov/view/dot/85735/dot_85735_DS1.pdf
File Type:

[PDF - 8.19 MB ]

File Language:

English

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