Title page for etd-0429111-134020


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URN etd-0429111-134020
Author Ming-Shiung Gau
Author's Email Address No Public.
Statistics This thesis had been viewed 5351 times. Download 1310 times.
Department IAMPUT
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Analysis of topography induced flow variations along the Gao-Ping Submarine Canyon based on hydrographic observations
Date of Defense 2011-01-24
Page Count 81
Keyword
  • Submarine Canyon
  • topography effects
  • slope
  • Baroclinic kinetic
  • Abstract This study investigates the hydrodynamic variations along the Gao-ping Submarine Canyon influence by the topography effects. The data used in this study were collected from two cruises of field observations using research vessel OR3. Instruments applied include sb-ADCP、bm-ADCP、moored-ADCP、CTD and several vertical strings of temperature loggers. Parameters recorded include flow velocities, water temperature and tidal elevation. The analysis method is enlightenment by the case study in the Monterey Canyon of California.
    The results show that (1) the current speed in the lower layer is faster than that of upper layer, which is explained due to v-shape of topography and bottom-trapped effect of internal tide. This result is consistent with previous studies. (2) In flood tide, the currents flowed into the Canyon from deep water to shallower. The baroclinic kinetic energy decreased to 0.2  at the turning point of canyon axis at 230m water, whichwas caused mainly by bottom friction. On the other hand, the baroclinic kinetic energy increased to 0.47  at 250m water in ebb tide when there was less influence of bottom friction. (3) In comparison the effects of bottom slope and area of cross section of the canyon, the baroclinic kinetic energy dissipation was mainly occurred at up slope flow during the flood tide. The change of the canyon width had less influence. During the ebb, the baroclinic kinetic energy was mainly due to the change of canyon width in the region shallower then the 230m of the second turning of the canyon. (4) The loss of kinetic energy during flooding up slope current can be verified by the changes of water mass temperature. Cold bottom was raised to upper layer when there was large drop of kinetic energy. There was likely a conversion of kinetic energy to potential energy. No upwelled cold water detected during ebb current with increase of kinetic energy.
    Advisory Committee
  • Tseng Ruo-Shan - chair
  • Lee I-Huan - co-chair
  • Chen Guan-Yu - co-chair
  • Yu-Huai Wang - advisor
  • Files
  • etd-0429111-134020.pdf
  • indicate access worldwide
    Date of Submission 2011-04-29

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