Model Development Experience

Gemma Tickle has over 25 years experience of developing source term and dispersion models for use in major hazards risk assessment. For much of this time Gemma has worked at ESR Technology (formerly AEA Technology). Her experience includes scientific review, model and software specification, model verification and validation. Experience includes the following projects:

• DRIFT - Atmospheric Dispersion

  DRIFT is an advanced integral model which was developed on behalf of the Health and Safety Executive. Gemma has worked on the development of DRIFT since 1990. DRIFT Version 3 is a significant enhancement based upon the recommendations in HSE Report RR629 http://www.hse.gov.uk/research/rrhtm/rr629.htm.

• STAWaRS - Water Reactive Liquid Spills

  STAWaRS is a model for water reactive liquid spills that was developed for HSE. The model is based upon HSE Report RR457 http://www.hse.gov.uk/research/rrhtm/rr457.htm.

• TDMA Model - Titanium Tetrachloride Spills

  TDMA Model is a bespoke model based on STAWaRS. The model was developed for the Titanium Dioxide Manufacturers Association (TDMA). TDMA funded experimental studies that were used to improve the model. This project was recognised in 2011 by IChemE as being an excellent example of how a trade body (TDMA), regulator (HSE), model developer (ESR Technology) and experimentalists (HSL) can work together to improve understanding and share best practise

• GASP - Liquid Pool Spread and Vaporisation

  GASP is a pool spread and vaporisation model that was developed by David Webber and Steve Jones at AEA Technology in the 1980s. Gemma worked on specification of the interface between GASP and DRIFT Version 2 and in 2006 managed a project which updated GASP to 32-bit including a new user interface.

• EJECT - Two-Phase Jet Dispersion

  EJECT is a momentum jet source term model which interfaces with DRIFT Version 2. EJECT includes modelling of eleveated and ground based jets. DRIFT Version 3 incorporates a jet model similar to EJECT.

• EC Research Projects

  Gemma has contributed to a number of collaborative EC research and development projects on source terms and dispersion, including:

  URAHFREP

  Aimed at increasing the understanding of behaviour of accidental releasesof anhydrous Hydrogen Fluoride. Includes wind tunnel and field trials. See Risoe's web page here for further details

  FLADIS

  Complex features in dense gas dispersion, including modelling of dense clouds on slopes.

  BUOYANT

  Modelling of very buoyant releases. AEA Technology in collaboration with University of Hamburg and the Finnish Met Institute.

  STEP Project AA

  Modelling of two-phase flashing releases. Model validation.