Title page for etd-0727113-131341


[Back to Results | New Search]

URN etd-0727113-131341
Author Chih-Kai Chang
Author's Email Address No Public.
Statistics This thesis had been viewed 5346 times. Download 203 times.
Department IAMPUT
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Laboratorial and numerical study on the interaction of internal solitary wave with the topography outside Dongsha Atoll
Date of Defense 2013-07-15
Page Count 130
Keyword
  • Donsha atoll
  • laboratory experiment
  • ISW
  • vertical eddy viscosity
  • numerical study
  • Abstract In the South China Sea, internal waves occur frequently, it is a site that important to
    study for internal waves, because the Donsha atoll just on path of internal waves
    propagate. There is a step measured a phenomenon of cooling water at depth about 20
    m on the Donsha atoll northeastern side by Wang et al.(2007). Further, Chen et al.
    (2010) had simulated internal waves interacting with topography of Donsha atoll by
    POM (Princeton Ocean Model), and found the internal waves bringing up cold deep
    water to the shallows.
    This study used the flume (12*0.5*0.7m) to set two-layers fluid system, and
    generating internal solitary waves by gravity-collpse to simulating the interaction of
    ISW with the topography model. This experiment focus on the variation of lower
    layer fluid carried on the step by ISW. A digital camera and MicroADV are used for
    save image and measure velocity for lower layer fluid on the step and then used
    inertial dissipation to obtain the energy dissipation by velocity. Finally, we used the
    k-ε turbulent model to obtain the eddy viscosity by energy dissipation.
    On the other hand, this study also simulated by POM, and the model setting refer to
    Chen et al.(2011). In order to enhance the mixing on the step, we modify turbulence
    scale length to increase vertical eddy viscosity KH、Km in Mellor-Yamada turbulence
    closure model, and KH、Km has increased indeed after modify, but it was unobvious
    that enhance mixing. Besides, in the result of simulate, we found a downward vertical
    velocity before internal waves into the step, this downward velocity has increased the
    vorticity at depth about 6 m on the step, and it cause KH、Km to high between internal
    waves and downward velocity.
    Advisory Committee
  • Ruo-Shan Tseng - chair
  • I-huan Lee - co-chair
  • Guan-Yu Chen - advisor
  • Files
  • etd-0727113-131341.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2013-08-27

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys