Development and Application by Incorporating Wwm3 into Numerical Modelling of Dynamic Crenulate Bay Shapes(III)

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Project title

Code/計畫編號

MOST107-2221-E019-036-MY3

Translated Name/計畫中文名

導入WWM3於動態岬灣形狀數值模擬之研發與應用(III)

Project Coordinator/計畫主持人

Tai-Wen Hsu

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Center of Excellence for Ocean Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=13336867

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Co-Investigator(s)

Chia-Ming Fan

Bugetid/研究經費

1200千元

ResearchField/研究領域

土木水利工程

本計畫導入WWM3 (wind wave model 3rd version Hsu et el. 2012; NOAA WAVEWATCH III, 2017) 於岬灣形狀數值模式中，用於描述岬灣在不同波浪條件(含波高、週期和波向)作用下，岬灣形狀之動態反應，特別是颱風波浪作用間岬灣後退幅度，颱風過後湧浪(swell)搬回之漂沙對岬灣恢復程度之預測能力與評估。本模式突破Hsu and Evans (1989)靜態岬灣(equibrium bay shape)之靜態平衡理論，也將本研究團隊研發之風浪模式WWM3，以波譜概念模擬不同波能作用下岬灣動態變化，並使用極座標計算岬灣形狀以高精確度研發成果應用於海岸工程之軟性防禦工法之規制設計。數值模式結果將與試驗和觀測結果比較，以校驗模式之適用性。在波浪條件作用下，模式結果將與Hsu et al. (2007)之靜態灣進行比較以證實模式之合理性。 A numerical model is developed to incorporate WWM3 (wind wave model of 3rd version, Hsu et al. 2012; NOAA WAVEWATCH III,2017) into the numerical modelling for describing shoreline planform in a crenulate bay beach. The model uses the polar coordinate to accurately and effectively compute the dynamic crenulate bay shapes under different wave conditions. The wave spectra predicted by WWM3 representing different wave conditions are used as the input wave energy resources to compute time variant shoreline shapes. Especially for simulating temporal evolution of bay shapes during typhoon wave attack and the following recovery of swell conditions. The model is calibrated using laboratory data with an incident wave angle ranging from 25o to 26o. The process of bay shape development observed from Anpin coast of Tainan City before and after Typhoon wave action is also compared with the present numerical model. In addition, the bay shape under a constant wave action is quite similar to the static equilibrium given by the well-known empirical parabolic equation of Hsu et al. (2006) The research results are applied to the planning and design of soft measures for coastal erosion and protection.

Keyword(s)

動態峡岬灣形狀
WWM3
颱風波浪
湧浪
極座標
海岸後蝕與防禦
crenulate bay shape
WWM3
Typhoon waves
swell
polar coordinate
coastal erosion and control

DSpace CRIS

Development and Application by Incorporating Wwm3 into Numerical Modelling of Dynamic Crenulate Bay Shapes(III)

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