Applying POM Model for Simulating Green Island Wake

  • 周 俊邦

Student thesis: Master's Thesis

Abstract

2-D external mode of the Princeton Ocean Model (POM) is applied to study Green Island wake induced by Kuroshio Subjects such as effects of domain bathymetry water surface elevation seasonal variation and wind field on Green Island wake are investigated The input data include bathymetry boundary surface elevations and wind fields Boundary surface elevations are derived from HYbrid Coordinate Ocean Model (HYCOM)/ Navy Coupled Ocean Data Assimilation (NCODA) and wind fields are derived from Physical Oceanography Distributed Active Archive Center (PO DAAC) Numerical studies use Taitung Open Ocean (TOO) domain and Green Island (GI) domain for simulating Green Island wake The results show that TOO is able to describe the whole vortex streets in the lee of Green Island and Orchid Island while GI is only capable of describing vortex street behind Green Island with more reasonable flow field compared with HYCOM/NCODA results Water depth limitation is varied to examine the depth effect on Green Island wake It is found that the main stream of Kuroshio in the case of 360 m maximum depth limitation is more consistent with realistic flow characteristics It is reasonable because the influence range of Kuroshio is on the top ocean layer Model tests with different boundary surface elevation input conditions reveal that the higher the velocity is the clearer the vortex street is Seasonal effect in simulations show the velocity field is larger in summer than in winter The vortex street in the lee of Green Island is stronger in summer but the weak vortex street occurs in winter The wind effect on Green Island wake is significant It is clear in the summer cases and it may be caused by the summer southwesterly monsoon
Date of Award2016 Jul 25
Original languageEnglish
SupervisorShih-Chun Hsiao (Supervisor)

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