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An overview of uncertainty quantification techniques with application to oceanic and oil‐spill simulations

Journal Article · · Journal of Geophysical Research. Oceans
DOI:https://doi.org/10.1002/2015JC011366· OSTI ID:1402364
 [1];  [1];  [2]; ;  [3];  [4]
  1. Rosenstiel School of Marine and Atmospheric Science University of Miami Miami Florida USA
  2. Tendral LLC Miami Florida USA
  3. Sandia National Laboratories Albuquerque New Mexico USA
  4. Department of Mechanical Engineering and Material Science, Duke University Durham North Carolina USA, Division of Computer, Electrical and Mathematical Science and Engineering, King Abdullah University of Science and Technology Thuwal, Saudi Arabia
Abstract

We give an overview of four different ensemble‐based techniques for uncertainty quantification and illustrate their application in the context of oil plume simulations. These techniques share the common paradigm of constructing a model proxy that efficiently captures the functional dependence of the model output on uncertain model inputs. This proxy is then used to explore the space of uncertain inputs using a large number of samples, so that reliable estimates of the model's output statistics can be calculated. Three of these techniques use polynomial chaos (PC) expansions to construct the model proxy, but they differ in their approach to determining the expansions' coefficients; the fourth technique uses Gaussian Process Regression (GPR). An integral plume model for simulating the Deepwater Horizon oil‐gas blowout provides examples for illustrating the different techniques. A Monte Carlo ensemble of 50,000 model simulations is used for gauging the performance of the different proxies. The examples illustrate how regression‐based techniques can outperform projection‐based techniques when the model output is noisy. They also demonstrate that robust uncertainty analysis can be performed at a fraction of the cost of the Monte Carlo calculation.

Sponsoring Organization:
USDOE
OSTI ID:
1402364
Journal Information:
Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Journal Issue: 4 Vol. 121; ISSN 2169-9275
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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