Skip to main content
Article thumbnail
Location of Repository

CHARACTERISTICS OF NEAR-BOTTOM WATER PARTICLE VELOCITIES IN WAVE-CURRENT CO-EXISTING FIELDS

By 雄一 岩垣, 敏之 浅野 and 浩 岡本

Abstract

Near-bottom water particle velocities in the fields where waves and currents co-exist areinvestigated both theoretically and experimentally. A new method is presented for calculatingthe water particle velocity in the turbulent boundary layer in a wave-current co-existing field.A boundary layer thickness δw in the co-existing field is expected to be variable with the waterparticle velocity of waves relatively to the current velocity. In this method, the boundary layerequation is solved as a free boundary problem by treating δw as an unknown boundary value.Several characteristics of the turbulent boundary layer such as the friction factor, friction velocity, boundary layer thickness and so on are calculated by this method, and the effect of the wave-currentvelocity ratio on them is discussed.In addition, near-bottom velocities are measured by a laser-doppler velocimeter in the current-only field, wave-only field and wave-current co-existing field, and the results are compared with thetheoretical ones.Near-bottom water particle velocities in the fields where waves and currents co-exist areinvestigated both theoretically and experimentally. A new method is presented for calculatingthe water particle velocity in the turbulent boundary layer in a wave-current co-existing field.A boundary layer thickness δw in the co-existing field is expected to be variable with the waterparticle velocity of waves relatively to the current velocity. In this method, the boundary layerequation is solved as a free boundary problem by treating δw as an unknown boundary value.Several characteristics of the turbulent boundary layer such as the friction factor, friction velocity,boundary layer thickness and so on are calculated by this method, and the effect of the wave-currentvelocity ratio on them is discussed.In addition, near-bottom velocities are measured by a laser-doppler velocimeter in the current-only field, wave-only field and wave-current co-existing field, and the results are compared with thetheoretical ones

Topics: 452.5
Publisher: Disaster Prevention Research Institute Kyoto University
Year: 1983
OAI identifier: oai:repository.kulib.kyoto-u.ac.jp:2433/70592
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.dpri.kyoto-u.ac.jp/... (external link)
  • http://hdl.handle.net/2433/705... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.