Wildfire risk, post-fire debris flows, and transportation infrastructure vulnerability

Andrew Fraser, Mikhail V. Chester, Benjamin Shane Underwood

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Wildfires have grown in number, size and intensity in the American West and forecasts predict worsening trends. Evidence mounts that post-fire debris flows pose a major hazard to infrastructure, particularly roadways. Vulnerabilities of assets to post-fire flows requires consideration of geologic, vegetative, and hydrologic conditions. A model that considers environmental conditions, post-fire effects, and transportation asset use is developed, and applied to a fire prone region in Arizona. 17% of watersheds have a greater than 20% chance of post-fire debris movements and flooding under a minor precipitation event. Additionally, there is a greater than 50% probability of post-fire debris flows where recent fires have occurred, validating the underlying model. The model shows the vulnerability of infrastructure to environmental and technological variables, drawing attention to the need to manage the risk as a broader system.

Original languageEnglish (US)
Pages (from-to)188-200
Number of pages13
JournalSustainable and Resilient Infrastructure
Issue number3
StatePublished - 2022


  • Wildfire debris flows
  • infrastructure
  • resilience
  • transportation
  • vulnerability

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction
  • Safety, Risk, Reliability and Quality


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