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http://dx.doi.org/10.5574/KSOE.2017.31.2.121

Effects of Tsunami Waveform on Energy Dissipation of Aquatic Vegetation  

Lee, Woo-Dong (Institute of Marine Industry, Gyeongsang National University)
Park, Jong-Ryul (Earthquake Hazard Research Division, National Disaster Management Research Institute)
Jeon, Ho-Seong (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Hur, Dong-Soo (Department of Ocean Civil Engineering, Gyeongsang National University)
Publication Information
Journal of Ocean Engineering and Technology / v.31, no.2, 2017 , pp. 121-129 More about this Journal
Abstract
The present study numerically investigated the influence of the waveform distribution on the tsunami-vegetation interaction using a non-reflected wave generation system for various tsunami waveforms in a two-dimensional numerical wave tank. First, it was possible to determine the wave attenuation mechanism due to the tsunami-vegetation interaction from the spatial waveform, flow field, vorticity field, and wave height distribution. The combination of fluid resistance in the vegetation and a large gap and creates a vortex according to the flow velocity difference in and out of the vegetation zone. Thus, the energy of a tsunami was increasingly reduced, resulting in a gradual reduction in wave height. Compared to existing approximation theories, the double volumetric ratio of the waveform increased the reflection coefficient of the tsunami-vegetation interaction by 34%, while decreasing the transfer coefficient and energy attenuation coefficient by 25% and 13%, respectively. Therefore, the hydraulic characteristics of a tsunami is highly likely to be underestimated if the solitary wave of the approximation theory is applied for the tsunami.
Keywords
Tsunami-vegetation interaction; Vegetation drag; Tsunami waveform; Wave energy dissipation; Navier-Stoeks solver;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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