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Title: Heavy gas dispersion over complex terrain
Author: Hankin, Robin Keinion Stinson
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1997
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Society benefits considerably from large scale industrial activities. However, these activities can have undesirable side effects which must be adequately controlled and monitored; the motivation for this thesis is risk assessment. Industrial processes often involve large amounts of hazardous, liquified gases, and accidental release of such substances poses a threat to nearby populations. Accidentally released gases are often denser than air and this thesis addresses the physics of dense gas dispersion. As dense gas clouds tend to adopt low-lying configurations, a shallow layer model (in which physical properties of the cloud are depth averaged) is indicated for simulating dense gas dispersion. This type of model has been comparatively neglected up to the present but is useful because it is capable of simulating the effect of complex terrain such as valleys and mountain ranges. This thesis presents a computationally validated and physically realistic shallow layer model for dense gas dispersion. A computational model has been developed to simulate the mathematical model. This model uses the flux correction scheme of Zalesak, generalized to account for complex terrain. The computational model is validated against a number of theoretical results. The model is then compared with a body of experimental data including large scale field trials, laboratory experiments, and established integral models. A case study, in which the present model was used on a real hazard site, is presented.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral