On the Study of Early-Stage Fluid Characteristics of Tsunami Generated by Underwater Earthquakes

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簡歷

基本資料

Project title

Code/計畫編號

MOST106-2221-E270-002-MY2

Translated Name/計畫中文名

海底地震引發海嘯之初期流體特性研究

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

劉啟民(計畫主持人)
楊智傑

Website

https://www.grb.gov.tw/search/planDetail?id=12384130

Year

2018

Start date/計畫起

31-08-2018

Expected Completion/計畫迄

31-07-2019

Co-Investigator(s)

Wen-Yang Hsu

Bugetid/研究經費

432千元

ResearchField/研究領域

土木水利工程

Tsunamis and flows induced by underwater earthquakes are always an important issue for both academic research and practical applications. This topic can be academically studied by theoretical analysis, numerical simulation and field observation, and these results must be carefully compared for verification. As catastrophic damages in either coastal or offshore regions frequently occur due to tsunamis, the related studies have crucial applications in disaster prediction and protection. In present project we will study the flow and tsunami induced by either vertically or horizontally moving plates. The study focuses on the characteristics, wave evolution and particle velocities at early stage. Theoretical analysis, numerical simulation and experimental measurement will be performed and their results will be compared with each other. After the wave properties at initial stage are fully analyzed and understood, the following propagation of tsunami will be numerically simulated. In theoretical part, three methods including the ADM-Padé method, matched asymptotic expansion, and integral transform will be performed. Non-hydrostatic sigma model and Boussinesq model will be adopted for numerical simulation. For laboratory measurements, both the collapse-type and piston-type wave generators will be designed and used to generated waves. In these analyses, key problems including (1) the initial wave profile and flow condition, (2) the rising time of the plate, (3) the scale of the moving plates, (4) nonlinear theory and its application, (5) the difference between laboratory measurement and real ocean, and (6) the comparison of theoretical, numerical and experimental results, will be extensively studied. We expect this two-year project not only can provide a reasonable and reliable way to evaluate the early-stage tsunami and flow generated by underwater earthquakes, but also can be applied for catastrophic disaster protections. 長期以來，海底地震所引發的海嘯及流體運動一直是學術界重要的研究課題。由於此類問題必須利用理論分析、數值模擬，以及現地觀察等不同方式進行分析及比較，因此具有高度的學術性。此外，由於海嘯生成、傳播，及近岸時的溯上經常造成嚴重的災害，因此相關研究也具有高度的實用性及應用性。本計畫研究的主題為板塊垂向錯動及板塊水平錯動時所引發的海嘯，探討的重點是海嘯生成初期的自由液面變化情形，以及流場速度的分析。預計將以理論分析、數值模擬及實驗分析等三種方式進行研究，並將結果進行交叉比較及驗證。在海嘯初期的流體特性分析完畢之後，再進行海嘯後續傳播時的數值分析。本研究的理論分析預計採用三種方法進行，包含ADM-Padé 解析法、匹配漸進展開法，以及積分轉換法：數值分析則採用非靜水壓 模式及布氏方程式分別進行模擬計算；而實驗部分則將設計崩潰式(collapse-type)及活塞式(piston-type)兩種造波(流)設備，量測流體發展的情形。研究的重點在於自由液面及流體起始條件、板塊運動的抬升時間、板塊運動的範圍、非線性理論的發展及應用、實驗模擬與真實情況的差異性、理論、數值及實驗的交互驗證。期待本計畫的成果除了能提升學術研究深度外，更能提供相關防災事務做為參考之用。

Keyword(s)

海底地震
海嘯
理論分析
數值模擬
實驗分析
underwater earthquake
tsunami
theoretical analysis
numerical simulation
experimental analysis

DSpace CRIS

On the Study of Early-Stage Fluid Characteristics of Tsunami Generated by Underwater Earthquakes

基本資料

Description