Multiscale Modeling of Ocean Currents on Island Wake and Estuary by Unstructured Meshes 2020

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基本資料

Project title

Code/計畫編號

MOST109-2221-E992-046-MY3

Translated Name/計畫中文名

以多尺度非結構網格模式模擬島嶼附近與河口地區之洋流

Project Coordinator/計畫主持人

Chia-Cheng Tsai

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Engineering,NKUST

Website

https://www.grb.gov.tw/search/planDetail?id=13530392

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1101千元

ResearchField/研究領域

土木水利工程

台灣為海島型國家，海洋能資源豐富，若能積極發展海洋能利用技術應不僅能供應內需，且能進入未來全球海洋能源市場。經濟部於2011年11 月公布新能源政策，在未來的16 年間，需完成至少600 MW 的海洋再生能源開發始能達到上述目標。我國現階段最具開發潛力之海洋再生能源之一，是長年穩定流經東部海域的黑潮。針對黑潮流經綠島引起的尾流現象，過去研究結果發現綠島尾流會產生渦街(vortex street)，且尾流裡的聚合或輻散的渦漩會產生湧升或沉降流的現象，此尾流對於洋流發電的選址至關重要，過去針對此物理現象的模擬，多使用巢狀網格模式，即先進行粗網格大範圍模擬，再將其結果做為島嶼附近高解析度尾流模擬的邊界條件。本計畫擬開發發展多尺度非結構網格海洋模式，可用於模擬島嶼附近多尺度海洋物理，如此可以解析耦合之島嶼尾流與介尺度之黑潮軌跡。除此以外，本海洋模式亦將用於模擬河口地區之多尺度複雜海洋水動力系統，考量的重要物理現象包含潮汐、遠域之洋流、上游之河川入流等。具體而言，我們將模擬淡水河口與台北港之多尺度洋流。 Taiwan is an island nation with rich ocean energy resources. With the positive development of ocean energy technology, it is not only possible to supply domestic demand but also can enter the future of the global marine energy market. Ministry of Economic Affairs in November 2011 announced a new energy policy that in the next 16 years the ocean energy should be completed at least 600 MW of marine renewable energy development. In Taiwan, one of the most potential development of ocean renewable energy is the current power of Kuroshio current. For Kuroshio wake caused by the Green Island, past research indicated that the wake behaves a vortex street appeared in the rear of the island, which will produce upwelling or downwelling phenomena that should be taken into account for an ocean current power plant. Traditionally, in order to model the island wake a global low-resolution ocean model is first performed and the results are used as the boundary condition for a local high-resolution model to simulate the island wake. In this study, we will develop an unstructured-grid ocean model to simulate the multiscale physics of the island wake. In a simulation on the Kuroshio wake caused by the Green Island, an unstructured grid will be constructed with high resolution around the island and low resolution elsewhere. Therefore, the fully coupled results will be obtained for the multiscale physics of the island wake and mesoscale Kuroshio path.In addition to the prescribed island wake, the model will also be used to model the multiscale physics of ocean/estuary exchange for which the effects of the estuary, tides and currents are important. Typically, the multiscale ocean hydrodynamics of the Tamsui estuary and Taipei harbor will be modelled.

Keyword(s)

非結構網格海洋模式
海洋能源
島嶼尾流
河口
多尺度物理
unstructured-grid ocean model
ocean energy
island wake
estuary
multiscale physics

DSpace CRIS

Multiscale Modeling of Ocean Currents on Island Wake and Estuary by Unstructured Meshes 2020

基本資料

Description