A framework to quantify uncertainty in simulations of oil transport in the ocean


Journal Article

© 2016. American Geophysical Union. All Rights Reserved. An uncertainty quantification framework is developed for the DeepC Oil Model based on a nonintrusive polynomial chaos method. This allows the model's output to be presented in a probabilistic framework so that the model's predictions reflect the uncertainty in the model's input data. The new capability is illustrated by simulating the far-field dispersal of oil in a Deepwater Horizon blowout scenario. The uncertain input consisted of ocean current and oil droplet size data and the main model output analyzed is the ensuing oil concentration in the Gulf of Mexico. A 1331 member ensemble was used to construct a surrogate for the model which was then mined for statistical information. The mean and standard deviations in the oil concentration were calculated for up to 30 days, and the total contribution of each input parameter to the model's uncertainty was quantified at different depths. Also, probability density functions of oil concentration were constructed by sampling the surrogate and used to elaborate probabilistic hazard maps of oil impact. The performance of the surrogate was constantly monitored in order to demarcate the space-time zones where its estimates are reliable.

Full Text

Duke Authors

Cited Authors

  • Gonçalves, RC; Iskandarani, M; Srinivasan, A; Thacker, WC; Chassignet, E; Knio, OM

Published Date

  • April 1, 2016

Published In

Volume / Issue

  • 121 / 4

Start / End Page

  • 2058 - 2077

Electronic International Standard Serial Number (EISSN)

  • 2169-9291

International Standard Serial Number (ISSN)

  • 2169-9275

Digital Object Identifier (DOI)

  • 10.1002/2015JC011311

Citation Source

  • Scopus