ERA Acute

The ERA Acute methodology is the new industry standard environmental risk assessment (ERA) method on NCS, replacing the MIRA method.
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ERAs are carried out with the purpose to assess and ensure acceptable environmental risk for oil and gas offshore operations, aiming to minimize the risk to the environment. ERA Acute has been developed by leading ERA experts, and provides the mean to evaluate the potential risk from an acute oil spill in the marine environment.

The ERA Acute method includes four environmental compartments: the sea surface, shoreline, water column and seafloor. ERA Acute uses input data from an oil spill trajectory model and biological resource data, and calculates the potential environmental risk (impact and recovery time) for biological resources in all compartments.

The ERA Acute software tool provides relevant visualization of the output results from the ERA Acute method, such as maps, graphs and tables. The tool has applications for environmental risk management, such as a risk matrix and a comparison tool which may support a spill impact mitigation analysis (SIMA) to evaluate that the best response is chosen to minimize impact of oil spills on people and the environment.

The ERA Acute method is published in an open access Springer Brief book. The book offers a comprehensive introduction to the ERA Acute methodology.

Relevant documents from the method development and dissemination are provided below. 

ERA Acute Method development:

  • EIF Acute Damage and restoration modelling (Report 1)
    • The report (2006) presents the EIF Acute damage and restoration modelling for environmental risk assessment of acute discharges, as a precursor of the ERA Acute method development.
  • Threshold values and exposure to risk functions for oil components in the water column to be used for risk assessment of acute discharges (EIF Acute) (Report 2)
    • The report (2006) presents biological effect threshold values and damage functions for oil in the water column. The results were included in the later developed ERA Acute method.
  • Surface compartment
    • Report 3 (2015) presents the ERA Acute method for the sea surface compartment. The report gives a detailed description on how the ERA Acute method calculates the impact and recovery for sea surface resources (e.g. sea birds) after a potential acute oil spill.
  • Shoreline Compartment
    • Report 4 (2015) presents the development of algorithms for the shoreline compartment. The report gives a detailed description on how the ERA Acute method calculates the potential impact and recovery for the shoreline after a potential acute oil spill. 
  • Water column Compartement
    • Report 5 (2015) presents the impact and restitution model for the water column compartment. The report gives a detailed description on how the ERA Acute method calculates the potential impact and recovery for water column resources (e.g. fish) after a potential acute oil spill. 
  • Seafloor Compartment
    • Report 6 (2015) presents the development of algorithms for the sea floor compartment. The report gives a detailed description on how the ERA Acute method calculates the potential impact and recovery for sea floor resources (e.g. corals) after a potential acute oil spill. 

ERA Acute validation and sensitivity studies, uncertainty handling

  • ERA Acute Methodology Uncertainty Feasibility Study (Uncertainty handling and scoring study).
  • ERA Acute sensitivity and uncertainty testing.
    • The report (2018) presents the results of deterministic and stochastic sensitivity testing of ERA Acute surface, water column and shoreline compartments
  • ERA Acute Seafloor compartment sensitivity testing and Norwegian Sea Test Case Data
    • The report (2017) presents the results of the deterministic and stochastic sensitivity testing of the sea floor compartment, and documents the test data used in the sea floor test case study
  • ERA Acute Sea floor Compartment Norwegian Sea Test Case
    • The report (2017) presents the results of case using the seafloor algorithms and test data

ERA Acute Method presented at Conferences:

  • ERA Acute – A Multi-Compartment Quantitative Risk Assessment for Oil Spills
  • ERA Acute—Implementation of a New Method for Environmental Risk Assessment of Acute Offshore Oil Spills
    • The ERA Acute method was presented at the SPE International Conference and Exhibition on Health, Safety, Security, Environment, and Social Responsibility in April 2018
    • Presentation
    • Conference paper