Shallow layer simulation of heavy gas released on a slope in a calm ambient Part I. Continuous releases
Shallow layer simulation of heavy gas released on a slope in a calm ambient Part I. Continuous releases
Although much research considers heavy gas dispersion over flat ground, less is known about the physics of dense gas dispersion on a slope. Here, the appropriateness of shallow layer models for the simple case of releases over a slope in a calm ambient is assessed.
This two-part paper assesses the value of shallow layer modelling using the established shallow layer model TWODEE [J. Hazard. Mater. 66 (3) (1999) 211; J. Hazard. Mater. 66 (3) (1999) 227; J. Hazard. Mater. 66 (3) (1999) 239] and the experimental results of Schatzmann et al. [M. Schatzmann, K. Marotzke, J. Donat, Research on continuous and instantaneous heavy gas clouds, contribution of sub-project EV 4T–0021-D to the final report of the joint CEC project, Technical Report, Meteorological Institute, University of Hamburg, February 1991]. Part I considers continuous releases, and part II considers instantaneous releases; both use the same model with the same entrainment coefficients.
For continuous releases, cloud arrival times are generally well predicted, and cloud concentrations are generally correct to within a factor of two. Shallow layer models thus appear to be capable of physically accurate simulation of continuous releases over a slope in a calm ambient.
Heavy gas dispersion, Continuous releases, Shallow layer modelling, Risk assessment, Slopes
205-215
Hankin, R.K.S.
296864a6-e423-44b6-ad0e-25422c913540
31 October 2003
Hankin, R.K.S.
296864a6-e423-44b6-ad0e-25422c913540
Hankin, R.K.S.
(2003)
Shallow layer simulation of heavy gas released on a slope in a calm ambient Part I. Continuous releases.
Journal of Hazardous Materials, 103 (3), .
(doi:10.1016/S0304-3894(03)00224-3).
Abstract
Although much research considers heavy gas dispersion over flat ground, less is known about the physics of dense gas dispersion on a slope. Here, the appropriateness of shallow layer models for the simple case of releases over a slope in a calm ambient is assessed.
This two-part paper assesses the value of shallow layer modelling using the established shallow layer model TWODEE [J. Hazard. Mater. 66 (3) (1999) 211; J. Hazard. Mater. 66 (3) (1999) 227; J. Hazard. Mater. 66 (3) (1999) 239] and the experimental results of Schatzmann et al. [M. Schatzmann, K. Marotzke, J. Donat, Research on continuous and instantaneous heavy gas clouds, contribution of sub-project EV 4T–0021-D to the final report of the joint CEC project, Technical Report, Meteorological Institute, University of Hamburg, February 1991]. Part I considers continuous releases, and part II considers instantaneous releases; both use the same model with the same entrainment coefficients.
For continuous releases, cloud arrival times are generally well predicted, and cloud concentrations are generally correct to within a factor of two. Shallow layer models thus appear to be capable of physically accurate simulation of continuous releases over a slope in a calm ambient.
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Published date: 31 October 2003
Keywords:
Heavy gas dispersion, Continuous releases, Shallow layer modelling, Risk assessment, Slopes
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Local EPrints ID: 58513
URI: http://eprints.soton.ac.uk/id/eprint/58513
ISSN: 0304-3894
PURE UUID: c24d89e4-b35f-4660-be00-0c45094f9576
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Date deposited: 14 Aug 2008
Last modified: 15 Mar 2024 11:11
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Author:
R.K.S. Hankin
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