http://scholars.ntou.edu.tw/handle/123456789/20459
Title: | Effect of porosity on an internal solitary wave propagating over a porous trapezoidal obstacle | Authors: | Cheng, Ming-Hung Hsieh, Chih-Min Hsu, John R-C. Hwang, Robert R. |
Keywords: | SLOPE-SHELF TOPOGRAPHY;SEDIMENT RESUSPENSION;NUMERICAL-SIMULATION;BREAKING;GENERATION;FLOW;PERMEABILITY;BREAKWATERS;PYCNOCLINE;EVOLUTION | Issue Date: | 15-Jan-2017 | Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | Journal Volume: | 130 | Start page/Pages: | 126-141 | Source: | OCEAN ENG | Abstract: | A permeable seabed may influence the evolution of an internal solitary wave propagating on a continental shelf and nearshore. In order to study the porous effect, numerical simulations are performed to investigate the flow field and waveform inversion of a large depression ISW propagating over a porous trapezoidal obstacle. A finite volume based Cartesian grid method is adopted to solve the Reynolds averaged Navier-Stokes equations using a kappa-epsilon model for the turbulent closure and porous media model together. Numerical results reveal that waveform inversion weakens significantly, as the porosity of the obstacle increases, except when porosity n(f)< 0.2. At the same time, the magnitude of vorticity and turbulent energy decrease remarkably due to acute reduction of the production term induced by percolation and wave-pore interaction. Moreover, a skewed hump shaped relation appears between the maximum vorticity and the porosity. For transmitted wave energy on a horizontal plateau, total energy may decrease as n(f) < 0.2 but increases moderately while n(f)> 0.2 during a strong wave-obstacle interaction. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/20459 | ISSN: | 0029-8018 | DOI: | 10.1016/j.oceaneng.2016.11.067 |
Appears in Collections: | 03 GOOD HEALTH AND WELL-BEING |
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