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Modeling the mudslide aftermath of the 2007 Southern California Wildfires

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  • Diandong Ren
  • Rong Fu
  • Lance Leslie
  • Robert Dickinson

Abstract

An investigation is made of the influence of fire-caused deforestation on precipitation-triggered, shallow landslide susceptibilities in southern California, using a scalable and extensible geo-fluid model (SEGMENT), that accounts for soil mechanics, root distribution, and relevant hydrologic processes. SEGMENT is applicable to variable regional topography, soil thickness profiles, and vegetation coverage. In this study, for southern California following the 2007 wildfires, three experiments were performed with rainfall recurrence periods chosen to be 2, 10, and 25 years. These intervals correspond to 24-h storm rainfall totals of 17, 25.4, and 33 mm. The model generated landslide stability maps that identified three areas of high instability. These unstable regions are located in the San Fernando Valley, the San Gabriel Mountains, and the Santa Monica Mountains. In each case, the vegetation cover had been severely burned during the preceding 2007 wildfires. The model results showed that burning from wildfires is a major destabilizing factor for southern California. Burn sites are more prone to landslides than vegetated slopes because the soil more readily exceeds its critical moisture content. Severe droughts in a future warming climate are expected to increase the likelihood of more frequent and intense wild fires. Higher temperatures combined with decreased total rainfalls facilitate more intense landslides, including devastating mudslides, following heavy precipitation. Finally, the model is designed to assist in developing timely mitigation measures for post-fire, storm-triggered landslides. Copyright Springer Science+Business Media B.V. 2011

Suggested Citation

  • Diandong Ren & Rong Fu & Lance Leslie & Robert Dickinson, 2011. "Modeling the mudslide aftermath of the 2007 Southern California Wildfires," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 57(2), pages 327-343, May.
    • Handle: RePEc:spr:nathaz:v:57:y:2011:i:2:p:327-343
    DOI: 10.1007/s11069-010-9615-5
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    References listed on IDEAS

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    1. James M. Griffin (ed.), 2003. "Global Climate Change," Books, Edward Elgar Publishing, number 2924.
    2. AfDB AfDB, . "African Development Report 2004," African Development Report, African Development Bank, number 21 edited by Adeleke Oluwole Salami, August.
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    Cited by:

    1. Joe Scott & Don Helmbrecht & Matthew Thompson & David Calkin & Kate Marcille, 2012. "Probabilistic assessment of wildfire hazard and municipal watershed exposure," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 64(1), pages 707-728, October.

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