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A preliminary approach to quantifying the overall environmental risks posed by development projects during environmental impact assessment

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  • Sam Nicol
  • Iadine Chadès

Abstract

Environmental impact assessment (EIA) is used globally to manage the impacts of development projects on the environment, so there is an imperative to demonstrate that it can effectively identify risky projects. However, despite the widespread use of quantitative predictive risk models in areas such as toxicology, ecosystem modelling and water quality, the use of predictive risk tools to assess the overall expected environmental impacts of major construction and development proposals is comparatively rare. A risk-based approach has many potential advantages, including improved prediction and attribution of cause and effect; sensitivity analysis; continual learning; and optimal resource allocation. In this paper we investigate the feasibility of using a Bayesian belief network (BBN) to quantify the likelihood and consequence of non-compliance of new projects based on the occurrence probabilities of a set of expert-defined features. The BBN incorporates expert knowledge and continually improves its predictions based on new data as it is collected. We use simulation to explore the trade-off between the number of data points and the prediction accuracy of the BBN, and find that the BBN could predict risk with 90% accuracy using approximately 1000 data points. Although a further pilot test with real project data is required, our results suggest that a BBN is a promising method to monitor overall risks posed by development within an existing EIA process given a modest investment in data collection.

Suggested Citation

  • Sam Nicol & Iadine Chadès, 2017. "A preliminary approach to quantifying the overall environmental risks posed by development projects during environmental impact assessment," PLOS ONE, Public Library of Science, vol. 12(7), pages 1-21, July.
  • Handle: RePEc:plo:pone00:0180982
    DOI: 10.1371/journal.pone.0180982
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    References listed on IDEAS

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