Modeling of the initial vertical dispersion parameters of mixing zone for predicting carbon monoxide concentrations near intersections

Abstract

A new method for predicting initial vertical dispersion parameters (Oz 0 ) for use in modeling carbon monoxide (CO) concentrations near at grade traffic intersections via the TEXIN2 computer model is introduced. The oz 0's were developed using the College Station database and tested with the Caltrans and the Melrose Park intersection databases. The prediction accuracy of TEXIN2 is improved significantly for three databases as determined by the slopes and intercepts of the regression lines for predicted versus monitored co. With the technique developed by Benson (1980), the Oz 0's for straight line sources are independent of stability class. That overpredicts the CO concentrations under low wind speeds. In this research, the oz 0's near intersections are modeled to be dependent upon stability class as well as other variables. The Oz 0's were determined to be a function of approaching vehicle speed for meteorological stability class A; were constants for stability classes B, C, and D; and were functions of both wind speed and approaching vehicle speed for stability class F.

Notes

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Graduation Date

1991

Semester

Summer

Advisor

Cooper, C. David

Degree

Doctor of Philosophy (Ph.D.)

College

College of Engineering

Department

Civil and Environmental Engineering

Format

PDF

Pages

231

Language

English

Length of Campus-only Access

None

Access Status

Doctoral Dissertation (Open Access)

Identifier

DP0029079

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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