Incorparation of Wwm and Homse Forsimulationg Waves Propagating Submerged Breakwater over a Sloping Beach

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Project title

Code/計畫編號

NSC100-2221-E006-010-MY3

Translated Name/計畫中文名

方向不規則波通過斜坡地形上潛堤變形之研究-子計畫一：以WWM結合高階緩坡方程式模擬方向不規則波通過斜坡地形上潛堤之變形

Project Coordinator/計畫主持人

Tai-Wen Hsu

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Co-Investigator(s)/共同執行人

林炤圭

Department/Unit

Department of Hydraulic and Ocean Engineering,NCKU

Website

https://www.grb.gov.tw/search/planDetail?id=2349286

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Bugetid/研究經費

494千元

ResearchField/研究領域

土木水利工程

本計畫以延伸型緩坡方程式 (extended mild-slope equation, EMSE) 為基礎，將Hsu et al. (2005) 所研發之風浪模式 (Wind wave model, WWM) 擴展其功能，使模式具有模擬波浪折、繞射及碎波和能量消散之功能，並考慮浪流交互作用之影響。在EMSE 中之高階項，如陡變地形和浪流交互作用項，將以修正係數引入風浪模式中之波浪作用力平衡方程式中 (wave action balance equation)，使波浪傳遞從平均位相 (無方向性)轉為解析位相有方向的波動現象，更能符合海域實際波動現象。修正係數之影響因素將於本計畫中討論分析。另本模式將配合海洋大學平面水池造波設備(含規則波和不規則波)，由數值計算結果比較波浪通過斜坡地形上離岸潛堤之波形變化，校核本模式之適用性。 Based on the extended mild-slope equation (EMSE), the wind wave model (WWM; Hsu et al., 2005) is modified to account for wave refraction, diffraction, wave breaking and energy dissipation for wind waves propagating over a sloping seabed in the presence of current. The combined effect of the higher-order bottom effect terms are incorporated into the wave action balance equation through the correction of wavenumber and propagation velocities using a refraction-diffraction correction parameter derived from EMSE. The phase-decoupled WWM is applicable for describing the directional turning rate of wave propagation for a given wave spectrum. The relative importance of additional terms including a higher-order bottom components, wave-bottom interaction source term and wave-current interaction that influence the refraction-diffraction correction parameter is discussed. The applicability of the proposed model to calculate wave transformation over a submerged breakwater induced wave refraction, diffraction, breaking and energy dissipation is examined through experiments conducted in a wave basin.

Keyword(s)

波浪折繞射
浪流交互作用
碎波和能量消散
風浪模式
延伸型緩坡方程式
wave refraction-diffraction
wave breaking and energy dissipation
phase-decoupled wave model
higher-order bottom components
wave-current interaction

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Incorparation of Wwm and Homse Forsimulationg Waves Propagating Submerged Breakwater over a Sloping Beach

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