Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.650013
Title: Particle image velocimetry experiments on surf-zone breaking waves
Author: Emarat, Narumon
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2000
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Abstract:
An experimental study on kinematics and turbulent structures in surf-zone breaking waves has been carried out in laboratory wave flumes. Particle Image Velocimetry (PIN) was used as a measurement technique to obtain the full field, instantaneous velocity throughout the breaking process. The experiments were performed on a single plunging breaker, a train of weak plunging breakers and a train of spilling breakers; all of which were generated on a 1/13 plane sloping beach. Measurements were carried out in a way which would allow mean flow and turbulent characteristics to be determined. The PIV velocity data were post-processed by means of an ensemble average (for the single plunging breaker) and a phase average (for the trains of breakers). The spatial distributions of mean velocity, mean vortic­ity and turbulent intensity, for each type of breaking wave, are presented. The results ob­tained from the single plunging breaker experiments are also compared to those predicted by a numerical model based on a Navier-Stokes solver. Furthermore, turbulent kinetic energy transportation is examined, based on the k-equation. The turbulent advection and production are calculated directly from the PIV data while the turbulent diffusion and dissipation are es­timated. By this means the turbulent transport process for different types of the surf-zone breaker is investigated. The influence of wave and turbulence characteristics on successive waves is also determined. Comparisons are made with the results of other researchers; some of which were carried out with different optical measuring techniques.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.650013  DOI: Not available
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