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The Application of Nonlinear Fourier Analysis to Soliton Quantification for Offshore Engineering

[+] Author Affiliations
Gus Jeans

Oceanalysis, Wallingford, UK

Wenting Xiao, Douglas A. Mitchell

ExxonMobil Upstream Research Company, Houston, TX

Alfred R. Osborne

Nonlinear Waves Incorporated, Alexandria, VA

Christopher R. Jackson

Global Ocean Associates, Alexandria, VA

Paper No. OMAE2017-61943, pp. V001T01A023; 12 pages
doi:10.1115/OMAE2017-61943
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5763-2
  • Copyright © 2017 by ASME

abstract

This paper describes the first application of Nonlinear Fourier Analysis to the quantification of internal soliton current speeds in offshore engineering design. Large amplitude solitary internal waves produce strong, rapidly varying currents that may cause hazards to offshore operations in several regions of the world. These phenomena are commonly referred to in Industry as “solitons.” Soliton quantification was undertaken using the latest methodologies and software available from the Nonlinear Fourier Analysis Spectral Tools (NFAST) Joint Industry Project.

Solitons require rapidly sampled in-situ data for reliable quantification. Such measurements are typically of very short duration compared to the time scales needed for engineering quantification. Similarly, numerical models capable of representing solitons are computationally expensive, and thus have limited capabilities for efficiently developing the long-term simulations required to supplement in-situ data. NFAST aims to address these issues by enabling new Hyperfast Nonlinear Fourier Analysis computational techniques.

Interface displacements, derived from temperature measurements, were the primary input to soliton quantification. Associated current speeds were estimated from relevant theory and validated with available measured current data. In this particular case, the temperature measurements are considered to be more reliable than using the measured current data directly.

Application of NFAST codes produced a synthetic dataset of soliton amplitudes and speeds with an effective duration of approximately 100 years, a period that is considerably greater than the duration of available measured data. This provided extreme values consistent with extrapolation of the measured soliton data, but with a considerable reduction in uncertainty.

Copyright © 2017 by ASME

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