Deep Neural Network-based Optimization Framework for Safety Evacuation Route during Toxic Gas Leak Incidents

Seung Kwon Seo, Young Gak Yoon, Ju sung Lee, Jonggeol Na, Chul Jin Lee

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Evacuation planning is important for reducing casualties in toxic gas leak incidents. However, most evacuation plans are too qualitative to be applied to unexpected practical situations. Here, we suggest an evacuation route proposal system based on a quantitative risk evaluation that provides the safest route for individual evacuees by predicting dynamic gas dispersion with a high accuracy and short calculation time. Detailed evacuation scenarios, including weather conditions, leak intensity, and evacuee information, were considered. The proposed system evaluates the quantitative risk in the affected area using a deep neural network surrogate model to determine optimal evacuation routes by integer programming. The surrogate model was trained using data from computational fluid dynamics simulations. A variational autoencoder was applied to extract the geometric features of the affected area. The predicted risk was combined with linearized integer programming to determine the optimal path in a predefined road network. A leak scenario of an ammonia gas pipeline in a petrochemical complex was used for the case study. The results show that the developed model offers the safest route within a few seconds with minimum risk. The developed model was applied to a sensitivity analysis to determine variable influences and safe shelter locations.

Original languageEnglish
Article number108102
JournalReliability Engineering and System Safety
StatePublished - Feb 2022

Bibliographical note

Funding Information:
Funding: This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIT) ( NRF-2021R1C1C1012031 ), and the Chung-Ang University Graduate Research Scholarship in 2019 .

Publisher Copyright:
© 2021 Elsevier Ltd


  • Computational fluid dynamics
  • Evacuation
  • Surrogate model
  • Toxic gas leak
  • Variational autoencoder


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