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題名 | 波流交互作用通過剛性有限厚度孔隙底床所引致之能量損失=Wave-Current Interaction Induced the Energy Dissipation over the Rigid Finite-Thickness Porous Seabed |
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作 者 | 林敬樺; 許弘莒; 陳陽益; 陳冠宇; | 書刊名 | 海洋工程學刊 |
卷期 | 15:1 2015.03[民104.03] |
頁次 | 頁37-56 |
分類號 | 351.941 |
關鍵詞 | 波流交互作用; 剛性多孔底床; 非線性非穩態孔隙流模式; 能量損失; 都普勒效應; Wave-current interaction; Rigid porous seabed; Nonlinear-unsteady porous flow model; Energy dissipation; Doppler's shift; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用線性波浪理論及非線性非穩態孔隙流模式,在不考慮波浪非線性及邊界層黏滯效應下,分析波流與有限厚度多孔剛性底床互制作用所造成之能量損失及底床孔隙水壓力。此非線性非穩態孔隙流模式同時考慮線性、慣性及紊流所引致之阻抗效應,並以一線性化阻抗係數來表示。本文之解析解與試驗結果相當符合。由線性分析顯示,在波流同向時,都普勒效應會降低能量損失並使整體能量損失之分布移往較低相對水深處;另外一方面,因都普勒效應之故,在波流同向時,其底床孔隙水壓力恆大於純波及波流反向時之底床孔隙水壓力,此結果暗示在波流同向時有較大的液化風險。 |
英文摘要 | This study applies the linear wave theory and nonlinear-unsteady porous flow model to analyze the combined wave-uniform current-porous media interaction induced the energy dissipation and the bed pore water pressure without the wave nonlinearity and the viscosity effect. The linear, inertial and turbulent resistances are included into the linear resistance coefficient for the nonlinear-unsteady porous model. The present results are quite agreement with existing measurement. Based on present results obtained by the linear approach, the energy dissipation in the wave-current-porous media interaction is influenced by Doppler shift. On the other hand, the bed pore water pressure in the wave-following current is always larger than that in the wave-alone and wave-opposing current due to Doppler shift. The result indicates that there is the higher liquefaction risk for the porous seabed in the wave-following current. |
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