First look at the new ARAC dispersion model

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Description

We describe a new atmospheric dispersion model being developed for the emergency response system of the US Department of Energy`s Atmospheric Release Advisory Capability (ARAC). This model solves the turbulent, advection-diffusion equation via a Lagrangian particle, Monte-Carlo method. Within a simulation, particles representing the pollutant are moved through the domain using a random displacement method to model the turbulent diffusion and a Runge-Kutta method to model the advection. The bottom boundary in the new model is a union of bilinear surfaces between gridded terrain data rather than the discontinuous `stair step` representation of terrain used previously in the ARAC. The ... continued below

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7 p.

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Leone, J.M., Jr.; Nasstrom, J.S. & Maddix, D.M. November 1, 1996.

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Description

We describe a new atmospheric dispersion model being developed for the emergency response system of the US Department of Energy`s Atmospheric Release Advisory Capability (ARAC). This model solves the turbulent, advection-diffusion equation via a Lagrangian particle, Monte-Carlo method. Within a simulation, particles representing the pollutant are moved through the domain using a random displacement method to model the turbulent diffusion and a Runge-Kutta method to model the advection. The bottom boundary in the new model is a union of bilinear surfaces between gridded terrain data rather than the discontinuous `stair step` representation of terrain used previously in the ARAC. The new model accepts winds on (x,y,o) grids that can be horizontally and vertically graded and nested in the horizontal.

Physical Description

7 p.

Notes

OSTI as DE98054673

Other: FDE: PDF; PL:

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  • 6. American Nuclear Society (ANS) topical meeting on emergency preparedness and response, San Francisco, CA (United States), 22-25 Apr 1997

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  • Other: DE98054673
  • Report No.: UCRL-JC--125034
  • Report No.: CONF-970419--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 653914
  • Archival Resource Key: ark:/67531/metadc708252

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1996

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:03 p.m.

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Leone, J.M., Jr.; Nasstrom, J.S. & Maddix, D.M. First look at the new ARAC dispersion model, article, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc708252/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.