Modelling landslide preconditioning in Nelson
United Kingdom
4d ago

Many homes in New Zealand are built on steep hillslopes at risk from landslides. This problem is compounded by frequent earthquakes and intense rainfall that cause frequent and widespread landsliding.

Large uncertainties remain in landslide hazard models particularly in the face of environmental forces such as shaking from earthquakes and increased climate variability as well as increased pressure from urban development.

Further research is needed on how these changes alter the stability of hillslopes in order to improve landslide hazard models.

For example, it is known that earthquakes not only trigger landslides but enhance the probability of slope failure in future earthquakes, but the mechanical details of this phenomenon are unknown.

This project will address three fundamental questions related to landslides in the Nelson region :

  • How do the geotechnical properties of slopes influence the trigger of landslides?
  • How do the soil and rock properties of slopes change as environmental conditions change?
  • How do earthquakes, rainfall and drought pre-condition slopes to fail?
  • The student will investigate these questions through the use of :
  • Historical data,
  • A month field investigation in New Zealand with GNS Science, and
  • Numerical models.
  • Results from these components will define relationships between parameters that can be used to enable evolving landslide hazard maps.

    The project will be conducted primarily in the University of East Anglia School of Environmental Sciences, where the background and existing knowledge to support this project are excellent.

    Training will be given where necessary geoscientific methods, general computing skills and specific software. The other institution involved in this project is GNS Science, where Dr Carey leads the landslide reactivation research theme.

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