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Dynamically evolving Gaussian spatial fields

In English

Författare

Summary, in English

We discuss general non-stationary spatio-temporal surfaces that involve dynamics governed by velocity fields. The approach formalizes and expands previously used models in analysis of satellite data of significant wave heights. We start with homogeneous spatial fields. By applying an extension of the standard moving average construction we obtain models which are stationary in time. The resulting surface changes with time but is dynamically inactive since its velocities, when sampled across the field, have distributions centered at zero. We introduce a dynamical evolution to such a field by composing it with a dynamical flow governed by a given velocity field. This leads to non-stationary models. The models are extensions of the earlier discretized autoregressive models which account for a local velocity of traveling surface. We demonstrate that for such a surface its dynamics is a combination of dynamics introduced by the flow and the dynamics resulting from the covariance structure of the underlying stochastic field. We extend this approach to fields that are only locally stationary and have their parameters varying over a larger spatio-temporal horizon.

Publiceringsår

2011

Språk

Engelska

Sidor

223-251

Publikation/Tidskrift/Serie

Extremes

Volym

14

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Probability Theory and Statistics

Nyckelord

  • Spectral density
  • Covariance function
  • Stationary second order
  • processes
  • Velocity field

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1572-915X