Numerical and Experimental Study on Irregular Waves by a Submerged Breakwater

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Project title

Code/計畫編號

NSC91-2611-E019-009

Translated Name/計畫中文名

不規則波浪通過潛堤之研究

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

岳景雲(計畫主持人)

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=753916

Year

2002

Start date/計畫起

01-08-2002

Expected Completion/計畫迄

31-07-2003

Co-Investigator(s)

Deng-How Tsaur

Bugetid/研究經費

383千元

ResearchField/研究領域

土木水利工程

本文利用波浪通過矩形潛堤所具有波長變短和消波減壓的特性，及波浪通過海底底床沙漣所產生的布拉格共振「 Bragg resonance」，互相組合成有如波浪狀的浪形 (wavy-type)潛堤來探討波浪散射效應。而數值計算方法採用邊界元素法 (BEM)解析規則波斜向入射通過水中浪形潛堤後其反射率之大小。 When waves are obstructed by a submerged breakwater,they will be forced to conform. Passing through this region,the two parts of the wave motion will then reunite. This leads to conjecture that such a submerged breakwater could be used as an effective device for wave pressure and/or length reduction. It has been found that waves of wavelength twice the wavelength of the sand ripples are subject to a strong reflection, depending on the number and amplitude of undulations. This kind of resonant reflection is known as Bragg resonance. The reflection problems of obliquely incident water waves in constant water depth caused by a wavy-type submerged breakwater are studied in this paper. The boundary element method (BEM) is applied to examine the reflection coefficients exerted on a wavy-type submerged breakwater.

Keyword(s)

浪形潛堤
沙漣
布拉格共振
反射率
Wavy-type submerged break- water
Sand ripples
Bragg resonance
Reflection coefficient

DSpace CRIS

Numerical and Experimental Study on Irregular Waves by a Submerged Breakwater

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