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http://dx.doi.org/10.12989/ose.2022.12.3.267

Vessel traffic geometric probability approaches with AIS data in active shipping lane for subsea pipeline quantitative risk assessment against third-party impact  

Tanujaya, Vincent Alvin (Ocean Engineering Program, Institut Teknologi Bandung)
Tawekal, Ricky Lukman (Ocean Engineering Program, Institut Teknologi Bandung)
Ilman, Eko Charnius (Ocean Engineering Program, Institut Teknologi Bandung)
Publication Information
Ocean Systems Engineering / v.12, no.3, 2022 , pp. 267-284 More about this Journal
Abstract
A subsea pipeline designed across active shipping lane prones to failure against external interferences such as anchorage activities, hence risk assessment is essential. It requires quantifying the geometric probability derived from ship traffic distribution based on Automatic Identification System (AIS) data. The actual probability density function from historical vessel traffic data is ideal, as for rapid assessment, conceptual study, when the AIS data is scarce or when the local vessels traffic are not utilised with AIS. Recommended practices suggest the probability distribution is assumed as a single peak Gaussian. This study compares several fitted Gaussian distributions and Monte Carlo simulation based on actual ship traffic data in main ship direction in an active shipping lane across a subsea pipeline. The results shows that a Gaussian distribution with five peaks is required to represent the ship traffic data, providing an error of 0.23%, while a single peak Gaussian distribution and the Monte Carlo simulation with one hundred million realisation provide an error of 1.32% and 0.79% respectively. Thus, it can be concluded that the multi-peak Gaussian distribution can represent the actual ship traffic distribution in the main direction, but it is less representative for ship traffic distribution in other direction. The geometric probability is utilised in a quantitative risk assessment (QRA) for subsea pipeline against vessel anchor dropping and dragging and vessel sinking.
Keywords
automatic identification system; Gaussian Distribution; marine traffic; Monte Carlo; QRA;
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