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Contaminated landslide runout deposits in rivers - Method for estimating long-term ecological risks.

G Göransson1, J Norrman2, M Larson3

  • 1Climate Adaptation, Swedish Geotechnical Institute, SE-412 96 Gothenburg, Sweden.

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Summary

Landslides with contaminated soil pose a long-term ecological risk to rivers. This study presents a method to assess this risk, showing contaminated deposits can exceed environmental quality standards for years.

Keywords:
ContaminationEcological riskLandslideProbabilistic methodRiver erosionWater quality

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Area of Science:

  • Environmental Science
  • Geology
  • Risk Assessment

Background:

  • Landslides with contaminated soil present a significant, understudied ecological risk to surface waters.
  • Previous research focused on short-term contaminant release, necessitating analysis of long-term impacts.

Purpose of the Study:

  • To develop and present a method for estimating the long-term ecological risk to water bodies from landslides carrying contaminated soil.
  • To assess the probability of surface water failing to meet environmental quality standards (EQS) post-landslide.

Main Methods:

  • A simplified transport model was formulated for probabilistic analysis of contaminated soil landslide impacts.
  • The model was applied to a case study involving a contaminated site near the Göta Älv River in Sweden.

Main Results:

  • Contaminated landslide deposits can elevate contaminant levels above EQS for extended periods.
  • Erosion of deposits is a multi-year process, with highest rates occurring initially.
  • Contaminated deposits act as a persistent source of pollution to downstream river systems.

Conclusions:

  • Preventing landslides of contaminated soil is crucial.
  • Prompt removal of contaminated landslide deposits is essential to mitigate long-term ecological damage.