Stratified flow over asymmetric and double bell-shaped obstacles

Balázs Gyüre, Imre M. Jánosi

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We performed experiments on quasi-two-dimensional lee-wave formation behind obstacles towed through a linearly stratified fluid. Initial transient times, amplitudes and wavelengths are measured for five different obstacle shapes at several flow velocities. We found that the wave field is determined primarily by the height and the leeward slope of the obstacle, in agreement with previous works. Differences between measured quantities and predictions of linear theories indicate that nonlinear effects are important in our parameter range. Experiments with a twin obstacle gave surprising results: average wavelengths and amplitudes are systematically lower than that of produced by an isolated obstacle, which we attribute to the dominance of essential nonlinearities such as anomalously strong wave dispersion.

Original languageEnglish
Pages (from-to)155-170
Number of pages16
JournalDynamics of Atmospheres and Oceans
Volume37
Issue number2
DOIs
Publication statusPublished - Aug 2003

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Keywords

  • Laboratory experiments
  • Lee-waves
  • Resonant wave interaction
  • Stratified flow

ASJC Scopus subject areas

  • Oceanography
  • Geology
  • Computers in Earth Sciences
  • Atmospheric Science

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