Research on the Permeable Bed and Submerged Structure Effects of Wind Wave Model

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Project title

Code/計畫編號

MOST104-2221-E019-039

Translated Name/計畫中文名

風浪模式透水底床與透水潛式結構效應之研究

Project Coordinator/計畫主持人

Yuan-Jyh Lan

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

The Center of Excellence for the Ocean,National Taiwan Ocean University

Website

https://www.grb.gov.tw/search/planDetail?id=11588429

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

566千元

ResearchField/研究領域

土木水利工程

目前以波浪作用力平衡方程式發展之風浪數值模式，尚未考慮到波浪受透水底床與透水潛礁效應的影響。本研究建立一可模擬波浪通過透水底床與透水潛式結構引致波浪減衰效應之風浪數值模式。控制方程式以Hsu等人(2005)提出之WWM (Wind Wave Model)風浪模式之波浪作用力平衡方程式為基礎，導入Lan et al. (2015) 提出之紊流阻力係數推導方法，即參考Rojanankmthron等人(1990)所提出透水介質之緩坡方程式數值模式，同時引用Isobe (1987)處理波浪消散之方法，加入透水層效應能量消散係數，推導出具有透水底床與透水潛礁效應之波浪作用力平衡方程式。模式建置後以透水底床與透水潛堤實驗配置進行模式驗證，並得到合理的驗證結果，顯示本研究所發展的延伸型WWM風浪模式可應用於波浪通過透水底床與透水潛礁之問題。本研究並以延伸型WWM風浪模式探討考慮透水底床、透水潛礁效應對波浪影響。 The current phase-average wind wave model does not include the effect of porous bottoms and submerged permeable reefs on wave energy dissipation. The present research incorporates the dissipation coefficient for submerged porous media in the wave action equation (WAE) of Wind Wave Model (WWM) (Hsu et al., 2005). The coefficient of the turbulent flow resistance is obtained based on Lan et al. (2015), who reproduce the analysis of mild-slope equation proposed by Rojanakamthron et al. (1989) and emulate the Isobe (1987) method to add the effect of porous media in the WWM model. Reasonable comparisons with experiments and numerical results show the present model can be applied to propagating waves over porous beds and reefs. Using present extended WWM model, wave decay by the effect of porous bed and permeable reef was also be implemented.

Keyword(s)

風浪模式
波浪作用力平衡方程式
透水底床
透水潛式結構
緩坡方程式
波高減衰
wind wave numerical model
wave action balance equation
porous bed
permeable submerged structure
mild-slope equation
wave decay

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Research on the Permeable Bed and Submerged Structure Effects of Wind Wave Model

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