台灣附近海域之颱風波浪場之無網格模擬

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Project title

台灣附近海域之颱風波浪場之無網格模擬

Code/計畫編號

NSC98-2221-E022-019

Project Coordinator/計畫主持人

Chia-Cheng Tsai

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

許泰文

Department/Unit

Department of Information Technology,Toko University

Website

https://www.grb.gov.tw/search/planDetail?id=1926028

Year

2009

Start date/計畫起

01-08-2009

Expected Completion/計畫迄

31-07-2010

Bugetid/研究經費

625千元

ResearchField/研究領域

土木水利工程

本計畫擬發展無網格風波浪模式，用於模擬近岸或海洋地區之波譜。我們都知道，很多海岸或近岸的工程建設需要該地區的波浪資料，但這種波浪資料通常很難獲得或過於昂貴，因此，數值模式就可以用來解決這個問題，而數值模式也因此成了廣泛被採用的工程工具，並應用於實際的工程問題。另一方面，我們都知道台灣夏季常有大量的颱風，這些颱風經常構成嚴重的災害，與此同時，我們也知道，台灣附近的颱風，有其特殊之區域特性。因此，當工程師想要設計海岸或近岸結構物，颱風導致的波浪資料就變得很重要。因此，此一課題也當是台灣地區學者所應特別關注的。本計畫之共同主持人曾發展WWM用於模擬台灣附近之風波浪場。WWM使用有限元素法來解空間波譜。而本計畫擬以無網格數值法Kansa’s method來改良有限元素法。經過這樣的改良，本計畫將發展出完全不需要網格的數值方法，用以計算風波浪模式。我們將首先考慮平面風波浪場，用來驗證我們的模式，接下來，我們也將用此模式來驗證過去的颱風所造成的波浪場。未來，本團隊也將持續此研究主題，比如用在預報颱風或計風所造成的波浪場或結合其他颱風模式等研究。 In this project, we are going to develop a meshless wind wave model to simulate the wave spectra in both the offshore and oceanic areas. It is well known that many coastal and offshore engineering applications require detailed wave conditions at specific locations or areas. However, such information is usually not available or too expensive. As a result, numerical simulations are very much required to remedy this difficult and have become popular tools in practical engineering applications. On the other hand, there are a lot of typhoons in the summer season near Taiwan and they usually cause severe damages in the coastal regions. In addition, these typhoons perform their specific local characteristics from hurricanes in other areas. When engineers want to design structures in coastal or offshore areas, the significant wave heights induced by typhoons become highly valuable. Therefore, the study of typhoon induced wave spectra should be relevant research fields for researchers in Taiwan. The collaborating principal investigator had developed the WWM to simulate the typhoon induced wave spectra near Taiwan. In that study, the finite element method (FEM) was used to calculate the wave spectra in spatial coordinates. In this project, an improvement of the WWM will be made by replacing the FEM by Kansa’s method, which is a meshless numerical method. As a result, it can be expected that there will be a meshless numerical model to simulate wind wave if this project is supported. Waves induced by a planar wind field will be studied to validate this model. Then, the hindcastings of the past typhoons will be performed either in the last of this project or in a coming project. Studies on the forecasting of waves induced by monsoons and typhoons or even the combinations of wind wave models and numerical typhoon models are scheduled in coming projects.

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台灣附近海域之颱風波浪場之無網格模擬

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