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Title: Modified INPUFF model for studying the air dispersion of neutrally buoyant jet releases in urban areas

Abstract

As part of the Clean Air Act Amendments of 1990 (CAAA 1990), legislation was enacted requiring the performance of Risk Management Programs (RMPs) for facilities handling toxic substances and flammable materials. One of the three main components of the RMP is the hazard assessment, which requires the performance of air dispersion modeling and consequence analysis of identified accidental release scenarios for toxic substances and flammable materials. The emissions of toxic materials during accidental releases are typically of short duration, may be released as a vertical jet, and may also exhibit neutrally buoyant or dense gas behavior. The INPUFF model, a Gaussian integrated puff model is routinely used to study the dispersion of neutrally buoyant jet releases. Three dispersion algorithms are provided within the INPUFF model for studying the dispersion downwind of a source. The first option allows the use of classical Pasquill-Gifford scheme which is appropriate for rural locations. The second option allows the use of Irwin`s on-site scheme, and the third option allows the incorporation of user defined dispersion characteristics. However, most of the times, Option one is used for performing the dispersion analysis, even for accidental releases in urban areas. The use of INPUFF model with rural dispersionmore » coefficients (Option 1) would result in improper estimates of hazard distances. The EPA has also developed the Industrial Source Complex Short Term (ISCST) Model for studying the atmospheric dispersion of steady state neutrally buoyant releases. A comparison of the rural dispersion coefficients in INPUFF and ISCST models indicated that both models use the same rural dispersion coefficients.« less

Authors:
;  [1]
  1. Parsons Engineering Science, Inc., Pasadena, CA (United States)
Publication Date:
OSTI Identifier:
351726
Report Number(s):
CONF-970677-
TRN: IM9927%%251
Resource Type:
Conference
Resource Relation:
Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION; URBAN AREAS; CLEAN AIR ACTS; COMPLIANCE; ALGORITHMS; ENVIRONMENTAL TRANSPORT; I CODES

Citation Formats

Nand, K., and Olmos, M. Modified INPUFF model for studying the air dispersion of neutrally buoyant jet releases in urban areas. United States: N. p., 1997. Web.
Nand, K., & Olmos, M. Modified INPUFF model for studying the air dispersion of neutrally buoyant jet releases in urban areas. United States.
Nand, K., and Olmos, M. Wed . "Modified INPUFF model for studying the air dispersion of neutrally buoyant jet releases in urban areas". United States.
@article{osti_351726,
title = {Modified INPUFF model for studying the air dispersion of neutrally buoyant jet releases in urban areas},
author = {Nand, K. and Olmos, M.},
abstractNote = {As part of the Clean Air Act Amendments of 1990 (CAAA 1990), legislation was enacted requiring the performance of Risk Management Programs (RMPs) for facilities handling toxic substances and flammable materials. One of the three main components of the RMP is the hazard assessment, which requires the performance of air dispersion modeling and consequence analysis of identified accidental release scenarios for toxic substances and flammable materials. The emissions of toxic materials during accidental releases are typically of short duration, may be released as a vertical jet, and may also exhibit neutrally buoyant or dense gas behavior. The INPUFF model, a Gaussian integrated puff model is routinely used to study the dispersion of neutrally buoyant jet releases. Three dispersion algorithms are provided within the INPUFF model for studying the dispersion downwind of a source. The first option allows the use of classical Pasquill-Gifford scheme which is appropriate for rural locations. The second option allows the use of Irwin`s on-site scheme, and the third option allows the incorporation of user defined dispersion characteristics. However, most of the times, Option one is used for performing the dispersion analysis, even for accidental releases in urban areas. The use of INPUFF model with rural dispersion coefficients (Option 1) would result in improper estimates of hazard distances. The EPA has also developed the Industrial Source Complex Short Term (ISCST) Model for studying the atmospheric dispersion of steady state neutrally buoyant releases. A comparison of the rural dispersion coefficients in INPUFF and ISCST models indicated that both models use the same rural dispersion coefficients.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {12}
}

Conference:
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