Title page for etd-0910109-152908


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URN etd-0910109-152908
Author Ying-Tsao Lee
Author's Email Address No Public.
Statistics This thesis had been viewed 5345 times. Download 1793 times.
Department IAMPUT
Year 2009
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Numerical simulation of topography and stratification effects to the internal tide in Gaoping Submarine Canyon
Date of Defense 2009-08-21
Page Count 59
Keyword
  • submarine canyon
  • numerical simulation
  • model
  • POM
  • Kaoping
  • Gaoping
  • internal tide
  • Abstract It is generally understood that tidal currents ominated the flow field in many submarine canyons, and internal tide may be an order of magnitude more energetic than that of barotropic. The internal tide can be generated and amplified in a marine environment with the strong vertical density interface. The barotropic tides were known to play the dominant
    role in driving the internal tides at the topographic relief or shelf break.This research tries to look at the mechanisms of internal tides generation and propagation in the Kaoping Submarine Canyon off southwestern Taiwan, using Princeton Ocean Model (POM) with different settings. The model was tested with bottom topography of flat, a slope and real water
    depth, with and without vertical stratifications. The model settings are grid size 500m, simulate period days, radiation boundary condition at 4 sides. The model forcings are sea level variations at the west side, both semidiurnal tide (M2) and mixed tide (M2+K1) based on OSU tidal model TPXO 6.2. The results suggest that the offshore M2 tidal forcing
    can generate large internal tidal currents within the canyon with vertical density stratification. The internal tidal currents at the upper-layer of the canyon lag that of lower-layer 3~5 hours. There is no time lag and no
    amplification of current in the canyon if there is no stratification. There is a transition zone of minimum flow at depth of about 100-200m. Below the interface, the amplitude of semidiurnal internal tidal current increased with water depth in the canyon. The simulated density contours suggest a 120m amplitude vertical fluctuation center at 150m depth, with 5℃ temperature fluctuation. The computed baroclinic energy flux indicates that the energy in lower layer of the canyon is stronger than that of upper
    layer. The high energy flux appears at the canyon foot and rim, and propagates along the canyon axis landward.
    Advisory Committee
  • Chung-Pan Lee - chair
  • Ruo-Shan Tseng - co-chair
  • I-Huan Lee - co-chair
  • Guan-Yu Chen - co-chair
  • Yu-Huai Wang - advisor
  • Files
  • etd-0910109-152908.pdf
  • indicate accessible in a year
    Date of Submission 2009-09-10

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