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Scheda modello

LONGZ: Long Term Dispersion Model

It is a long period model (seasonal and yearly values) based on the gaussian plume hypothesis, that can take into account up to 14000 point or area sources in a flat or complex terrain. It assumes a non reactive (first order decay) pollutant, but can take into account sedimentation and dry deposition of particulate matter. It computes concentrations in any receptor point within a range of few tenth of kilometrs from the sources.

KEYWORDS

area: air quality
objectives: simulation
description: gaussian plume, multiple sources, deposition point sources, area sources, urban environment, inactive pollutant, short range, long term

SOFTWARE AVAILABILITY

You can download the software from
EPA - SCRAM Models

or directly: http://www.epa.gov/scram001/models/screen/longz.zip (IBM 3090 Mainframe Version, 56KB, ZIP)

The model is part of UNAMAP and is available on magnetic tape from:
Computer Products
National Technical Information Service
U. S. Department of Commerce
Springfield, Virginia 22161
Phone (703) 487-4650

AUTHORS

Jay R. Bjorklund and James F. Bowers
H. E. Cramer Company
P.O. Box 8049
Salt Lake City, Utah 84108

REFERENCES

  • J.R. Bjorklund e J.F. Bowers, USER'S INSTRUCTIONS FOR THE SHORTZ AND LONGZ COMPUTER PROGRAMS EPA Publication No. EPA-903/9-82-004a,b. U.S. Environmental Protection Agency, Region III, Philadelphia, PA, 1982.
  • EPA-450/2-78-027R, GUIDELINE ON AIR QUALITY MODELS U.S. Environmental Protection Agency, 1986.

VALIDATION STUDIES

  • J.R. Bjorklund e J.F. Bowers, USER'S INSTRUCTIONS FOR THE SHORTZ AND LONGZ COMPUTER PROGRAMS EPA Publication No. EPA 903/9-82-004a, b. U.S. Environmental Protection Agency, Region III, Philadelphia, PA, 1982.

 

 

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