On development and application of an oyster larvae transport model along Yunlin coast of Taiwan

  • 林 鼎傑

Student thesis: Doctoral Thesis


A Lagrangian-type particle tracking model is developed to simulate a life cycle of oyster larvae in the open sea including birth free-swimming transport biological motion settlement and death The model accuracy and applicability are carefully justified against basic mathematics and field data An application is made to investigate transport characteristics retention recruitment of oyster larvae along Yunlin coast of Taiwan Computed results suggest that typical flow motions along Yunlin coast are that flow moves to southwestward and northeastward during ebb and flood stages respectively Residual flows are obvious with a northeastward direction in offshore regions but relatively quiescent in nearshore regions having predominant effects for driving oyster larvae transport along Yunlin coast Results of a backward particle tracking simulation indicate that oyster larvae in the harvest regions come from southwest Field and laboratory clues both suggest that phototropism is a critical environment factor affecting motions of oyster larvae A set of numerical experiments point out that passive transport for 14 days and a step function of STST (i e moves only during daytime and flood stages) is the best assumption for modeling oyster larvae transport along Yunlin coast Results clearly point out that successful rates of settlement are generally under 19$ %$ in the present case A connectivity matrix is introduced to quantitatively understand connections between spawning and settlement zones It is generally observed that recruitment of oyster larvae in the northward zones are contributed by that from the south and harvest region Therefore a recommendation is proposed for local oyster farmers by holding certain adult oysters in order to have more opportunities for local recruitment of oyster larvae especially in the major harvest regions Computed residence time also suggests that flushing capacity along Yunlin coast is satisfactory showing a suitable environment for developing oyster production
Date of Award2016 Mar 21
Original languageEnglish
SupervisorShih-Chun Hsiao (Supervisor)

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