Title page for etd-0103112-152720


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URN etd-0103112-152720
Author Wen-yu Kuo
Author's Email Address No Public.
Statistics This thesis had been viewed 5343 times. Download 819 times.
Department IAMPUT
Year 2011
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Effects of bottom topography and flows on oceanic turbulent mixing
Date of Defense 2011-12-26
Page Count 93
Keyword
  • parameterization
  • turbulent mixing
  • eddy diffusivity
  • Peng-hu Channel
  • Kuroshio
  • Abstract This study investigates the turbulent mixing characteristics of Peng-hu Channel,
    South China Sea along 21°N and the Kuroshio region by using CTD/LADCP and
    MicroRider. Dissipation rate of turbulent kinetic energy or thermal variances is
    estimated primarily by the Thorpe overturn method, and is compared with the
    microstructure turbulence from direct measurement as well as those estimated from 
    the parameterization method based on shear and strain spectra.
    Our results indicate that there are different turbulent characteristics and dynamic
    mechanisms at these three regions. Because of its funnel-shaped topography and strong
    semi-diurnal tides in the Peng-hu Channel, the turbulent mixing and eddy diffusivity
    reach a maximum value at the narrowest part of Peng-hu Channel near its sea bottom
    and show a clear tidal variation.
    In the main stream of Kuroshio where the current speed is faster than 0.8 m/s,
    turbulent mixing is not particularly stronger than non-main stream zone. In the
    Kuroshio frontal zone between the Kuroshio and the coastal waters off east Taiwan
    coast, strong turbulent mixing in the surface layer can be detected. Island wake which
    is formed when Kuroshio runs into the Lan-yu Island is a transient feature. Strong
    mixing in the upper 100 m accompanied with upwelling and vortices were observed
    during one event.
    The topography along the latitude of 21°N is rugged and rough in the Luzon
    Strait which consists of several ridges and seamounts. Due to its complicated
    topography and generation of strong semi-diurnal internal tides, eddy diffusivity as
    high as 10^(-2)m^2/s was measured in the bottom layer of the Luzon Strait.
    Advisory Committee
  • Yiing-Jang Yang - chair
  • I-Huan Lee - co-chair
  • Yu-Huai Wang - co-chair
  • Ruo-Shan Tseng - advisor
  • Files
  • etd-0103112-152720.pdf
  • indicate access worldwide
    Date of Submission 2012-01-03

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