دانلود رایگان مقاله لاتین نفوذ اتصال در بی ثباتی سونامی از سایت الزویر
عنوان فارسی مقاله:
اثر سرریز و نفوذ اتصال در بی ثباتی سونامی ناشی از موج شکن کیسون
عنوان انگلیسی مقاله:
Effect of overflow and seepage coupling on tsunami-induced instability of caisson breakwaters
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The 2011 Tohoku earthquake tsunami devastated the eastern part of Japan and caused significant damage and destruction of breakwaters. The key factors contributing to the damage have been considered to be closely linked with the scour of the mound in the vicinity of breakwaters due to tsunami-induced overflow above the caissons (Arikawa et al., 2012; Arikawa and Shimosako, 2013). The seepage flow in mounds, stemming from the water level difference between offshore and onshore sides of the caissons, has also been considered to affect the stability of mounds (Takahashi et al., 2014; Sassa, 2014). However, the concrete mechanism at work in the instability of the breakwater foundation under the concurrent actions of the overflow and seepage due to a tsunami still remains unclear. The role of tsunami-induced overflow in the performance of coastal structures has attracted recent attention in view of the stability of breakwaters, seawalls, tidewalls and dikes (Hsiao and Lin, 2010; Gulera et al., 2015; Kihara et al., 2015; Shimozono and Sato, 2016). The role of seepage in tsunami or wave-induced scour around coastal and marine structures has also been studied recently (Sumer and Fredsøe, 2002; Tonkin et al., 2003; Qi and Gao, 2014; Sumer, 2014). However, the role played by coupling of overflow and seepage in scour and the effect of this coupling on the stability of coastal structures remain poorly understood. Against this background, the aims of this paper are, first, to clarify the processes involved in and the development of the mound scour due to tsunami-induced seepage and overflow, and secondly to investigate how the coupling actions affect the overall stability of caisson breakwaters. For this purpose, we have developed and applied a new centrifuge experimental system which is capable of controlling the overflow and seepage due to a tsunami. A concise report of preliminary experiment using the system developed was promptly published in Sassa et al. (2014). However, this paper presents and discusses three innovations, namely, (a) by elucidating the effect of overflow and seepage coupling on the development of mound scour as obtained from the experiments with different mound cross-sections and thickness, (b) by clarifying how the overflow and seepage coupling would contribute to the collapse of caisson breakwaters, revealing the mechanism for the concurrent processes of the instability involved, and (c) by examining the influence of a countermeasure in suppressing such an effect of coupled overflow and seepage on stabilization of the caissons. The present study is based on the results of our recent study on the effect of tsunami-induced seepage on the stability of mounds in caisson breakwaters (Takahashi et al., 2014; Sassa, 2014).
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کلمات کلیدی:
Effect of overflow and seepage coupling on tsunami-induced instability ... https://www.researchgate.net/.../307875241_Effect_of_overflow_and_seepage_coupling... Nov 1, 2016 - Effect of overflow and seepage coupling on tsunami-induced instability of caisson breakwaters on ResearchGate, the professional network for ... [PDF]Theoretical and Experimental Study on Tsunami Induced Instability of ... kenkyo.eng.kyushu-u.ac.jp/memoirs-eng/bulletin/72/2/paper3(72-2).pdf by S DONG - 2012 - Cited by 8 - Related articles Jun 2, 2012 - to analyze the stability of caisson under seepage flow. Two types of ... process of caisson type composite breakwaters against tsunami. Instability of Breakwater Foundation during Tsunami in a Drum ... https://www.onepetro.org/download/conference-paper/ISOPE-I-15-411?id...I-15... by J Miyamoto - 2015 - Cited by 1 - Related articles displacement of the caisson, leading to the breakwater failure. The scour of the rubble ... induced instability of foundation mound under a tsunami which leads to. Instability on the sandy ground under breakwater due to earthquake ... https://www.jstage.jst.go.jp/article/jgssp/2/25/2_JPN-081/_pdf by T Matsuda - 2016 - Cited by 1 - Related articles tsunami, when the earthquake includes long-period motion on a breakwater for a long time, the excessive pore ... The tsunami-induced soil seepage brought the ... Sand seabed. Caisson. Figure 1 Schematic of the calculation region: Type-A. Numerical Analysis on Stability of Caisson-Type Breakwaters under ... link.springer.com/article/10.1007/s40515-015-0022-y by Y Sawada - 2015 - Related articles Jun 11, 2015 - Numerical Analysis on Stability of Caisson-Type Breakwaters under Tsunami-Induced Seepage. Authors; Authors and affiliations. Scour and Erosion: Proceedings of the 7th International Conference ... https://books.google.com/books?isbn=1138027324 Liang Cheng, Scott Draper, Hongwei An - 2014 - Technology & Engineering Tsunami. overflow-seepage-coupled. centrifuge. experiment. In this study, we ... inspection and improvement of the stability of such breakwater foundations. ... at the vicinity of breakwaters due to tsunami-induced overflow above the caissons ...
