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Wave attenuation mechanism of cross-plates applied in landslide-induced tsunami in river course

Journal of Mountain Science 2017年第4期14卷 649-661页

作者： HUANG Bo-lin WANG Shi-chang Key Laboratory of Disaster Prevention and Mitigation of Hubei Province China Three Gorges UniversityYichang 443002China Wuhan Center of China Geological Survey Wuhan 430205Uhina

Since the impounding of the Three Gorges Reservoir, the channel of the Yangtze River has become a busy watercourse and the probability of landslide-induced tsunamis has increased. In the case of landslide-induced tsunamis in the Three Gorges Reservoir, even after shipping closures in advance, there are still facilities and objects in urgent need of protection within the risk zone of the watercourse, such as wharfs, marine fueling stations, berthed ships. The emergency protection against and decay of landslide-induced tsunamis in inland watercourses is a new challenge. In this study, 37 sets of wave decay experiments were conducted with the hydromechanics numerical method. The wave decay efficiencies of common simple structures including submerged horizontal plate, horizontal plate on the water surface, inclined thin plate and cross-plates in coastal areas were compared and analyzed. Cross-plates structure showed better wave decay capacity than other simple plates. The wave decay performance of cross-plates was related to five modes of energy dissipation and transformation, namely run-up/run-down, overtopping, reflecting, return flow and disturbed wave orbital path. The type of wave had little relation with the decay performance of cross-plates, but a strong correlation with cross-plates structure, especially the height of the vertical emerged plate. The best decay performance was observed when the ratio of wave amplitude to emerged vertical plate height was between 1 and 1.5, which can reduce up to about 8o% of the incoming wave amplitude. Finally, the emergency way of cross-plates applied to the decay of landslide-induced tsunami in river course is discussed. This study provides a conceptual reference for related studies to practice the attenuation of landslide-induced tsunami in reservoirs.

关键词： landslide-induced tsunami Cross-plates Wave decay Energy dissipation Attenuation mechanism

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Evaluation of Height of tsunami induced by Submarine landslide

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Journal of Energy and Power Engineering 2018年第1期12卷 35-43页

作者： Yoshikane Murakami Takemi Shikata Koji Tonomo Centers for Civil Engineering and Architectures Kansai Electric Power Co. Inc. Fukushima Ward Osaka Osaka 553-0003Japan Port and Coastal Engineering Group Newjec Inc. Kita Ward Osaka Osaka 531-0074 Japan

Under the new regulatory requirements for nuclear power plants in Japan, which were enacted in response to the nuclear accident associated with the Great East Japan Earthquake tsunami that occurred on 11 March 2011, it is a requirement to establish a site-specific ＂standard tsunami＂ based on numerical analysis considering non-seismic factors in addition to general seismic faults. It is necessary to establish a consistent evaluation scheme for estimation of tsunami height induced by submarine landslide, since a standard framework for evaluation has not yet been established even though several models for calculation have been proposed and applied in practice. In this study, we estimated the scale of submarine landslide from a literature survey and showed examples of tsunami height evaluation using multiple schemes. As a result of evaluation of tsunami height using three schemes, the Watts model, the KLS model, and the modified-KLS model, the result obtained by the KLS model was comparatively large for every case.

关键词： Submarine landslide landslide-induced tsunami tsunami height evaluation new regulatory requirements for nuclearpower plants in Japan standard tsunami.

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