Probabilistic Analysis of Dam Accidents Worldwide: Risk Assessment for Dams of Different Purposes in OECD and Non-OECD Countries with Focus on Time Trend Analysis
Anna Kalinina
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Search for more papers by this authorCorresponding Author
Matteo Spada
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Address correspondence to Matteo Spada, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland; tel: +41 56 310 56 90; matteo.spada@psi.ch.
Search for more papers by this authorPeter Burgherr
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Search for more papers by this authorAnna Kalinina
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Search for more papers by this authorCorresponding Author
Matteo Spada
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Address correspondence to Matteo Spada, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland; tel: +41 56 310 56 90; matteo.spada@psi.ch.
Search for more papers by this authorPeter Burgherr
Laboratory for Energy System Analysis, Paul Scherrer Institut, Villigen, Switzerland
Search for more papers by this authorAbstract
This study presents probabilistic analysis of dam accidents worldwide in the period 1911–2016. The accidents are classified by the dam purpose and by the country cluster, where they occurred, distinguishing between the countries of the Organization for Economic Cooperation and Development (OECD) and nonmember countries (non-OECD without China). A Bayesian hierarchical approach is used to model distributions of frequency and severity for accidents. This approach treats accident data as a multilevel system with subsets sharing specific characteristics. To model accident probabilities for a particular dam characteristic, this approach samples data from the entire data set, borrowing the strength across data set and enabling to model distributions even for subsets with scarce data. The modelled frequencies and severities are combined in frequency-consequence curves, showing that accidents for all dam purposes are more frequent in non-OECD (without China) and their maximum consequences are larger than in OECD countries. Multipurpose dams also have higher frequencies and maximum consequences than single-purpose dams. In addition, the developed methodology explicitly models time dependence to identify trends in accident frequencies over the analyzed period. Downward trends are found for almost all dam purposes confirming that technological development and implementation of safety measures are likely to have a positive impact on dam safety. The results of the analysis provide insights for dam risk management and decision-making processes by identifying key risk factors related to country groups and dam purposes as well as changes over time.
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