Predictability and Dynamics of Geophysical Fluids Flows - GRA Extension

Abstract

Research under this grant, an extension of Grant number N00014-98-1-08l3 that supported the completion of the Ph.D. thesis of Christopher L. Wolfe, focused primarily on computations of unstable nonlinear periodic solutions, time-dependent normal modes (Floquet vectors) and singular vectors in a two-layer quasi-geostrophic channel model. The model was studied in a strongly nonlinear regime, in which small disturbances to an unstable, steady, zonal, baroclinic shear flow grow to finite amplitude and continue to vacillate irregularly for arbitrarily long times. The computation of time-dependent, normal-mode disturbances to unstable, nonlinear, time-periodic basic flows in a high-dimensional geophysical fluid model opens a new perspective on the analysis of disturbance growth in time-dependent flows, and on the closely related problem of error growth in predictive models of time-dependent flows.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2007
Accession Number
ADA461005

Entities

People

  • Roger M. Samelson

Organizations

  • Oregon State University

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Amplitude
  • Atmospheric Sciences
  • Channel Models
  • Classification
  • Computations
  • Flow
  • Fluid Flow
  • Interdisciplinary Science
  • Predictive Modeling
  • Security
  • Shear Flow
  • Viscous Flow
  • Weather Forecasting

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Dynamics.
  • Research Science/Academic Research