Hindcasting of High Wave Conditions During Typhoon 8712

Yamaguchi, Masataka; Hatada, Yoshio; Ikeda, Akira; Hayakawa, Jun

doi:10.2208/jscej.1989.411_237

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…3. Yamaguchi et al [1989] hindcasted the wave conditions during the typhoon and concluded that its return period may have exceed 100 years, reaching H 1/3 = 6 m and T 1/3 = 13 s at the East Breakwater and H 1/3 = 5.5 m and T 1/3 = 13 s at the West Breakwater. Using these wave conditions the values of the EFEC are computed to be 0.227 and 0.131 for the East and West Breakwaters, respectively.…”

Section: Resultsmentioning

confidence: 99%

Practical Methods of Estimating Tilting Failure of Caisson Breakwaters Using a Monte-Carlo Simulation

Takagi

Esteban

2013

Coastal Engineering Journal

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The authors propose a new method to estimate the tilting failure of caisson breakwaters, using a Monte-Carlo simulation that can quantitatively and stochastically estimate failure probability. An index, referred to as "Expected Frequency Exceeding of a Critical Load (EFEC)" that expresses the potential tilting failure probability of caisson breakwaters is proposed and adopted in this model. Application of the model to 40 breakwaters in Japan reveals that the threshold value of EFEC that specifies whether a caisson breakwater is safe or unsafe could lie in the range from 0.02 to 0.04. The authors also found that unstable caisson geometry, showing a large value in the aspect ratio of the caisson, can provide additional indication of when tilting failure is likely to occur. It is expected that the present method can provide a practical way for engineers to judge the possibility of tilting failure in caisson breakwaters.

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Section: Resultsmentioning

confidence: 99%

Practical Methods of Estimating Tilting Failure of Caisson Breakwaters Using a Monte-Carlo Simulation

Takagi

Esteban

2013

Coastal Engineering Journal

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“…As can be seen, there is a positive correlation between the tilt and the lateral displacement. Yamaguchi et al (1989) estimated the wave conditions for this event by using two shallow-water wave-prediction models based on the radiative transfer equation. The significant wave height H 1=3 was estimated to be 8 .…”

Section: Case Studymentioning

confidence: 99%

Tilt displacement of caisson breakwater due to wave loading

Zhang¹,

Lee²,

Leung³

2009

Géotechnique

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Tilting and overturning of caisson breakwaters due to wave loading is well documented. Although simplified methods of caisson analysis have been proposed, they are either fully elastic analyses that do not account for permanent displacement, or stability analyses that determine whether overturning will occur. In reality, a caisson can incur significant tilt without overturning: such a phenomenon cannot be replicated by either of the above analyses. This paper presents a simplified analysis that takes into account the elastic caisson response as well as the accumulation of permanent tilt with successive wave cycles. Elastic response was simulated using a lumpmass-spring model. Permanent caisson tilt was analysed based on the assumption of the caisson tilting over a circular slip surface beneath its base. A search algorithm was used to determine the radius and depth to the centre of rotation of the critical slip circle. Permanent tilt is generated by the difference between the overturning and stabilising moments during wave peaks. This allows permanent tilt to be accumulated over successive wave peaks. Comparison with centrifuge test data shows that the analysis is able to capture the progressive build-up of tilt reasonably well. Furthermore, comparison with a field case of caisson failure during a storm shows good correlation, although uncertainty over the number of wave cycles precludes a more direct comparison.Le basculement et le renversement des brise-lames à caisson sous l'effet de la force des vagues sont bien documentés. Bien que des méthodes simplifiées d'analyse des caissons ont été proposées, il s'agit soit d'analyses entièrement élastiques qui ne tiennent pas compte du déplacement permanent, soit d'analyses de la stabilité qui déterminent l'éventualité du renversement. En réalité, les caissons peuvent subir un basculement considérablement sans se renverser : on ne peut reproduire ce phénomène avec l'une ou l'autre de ces analyses. La présente communication présente une analyse simplifiée qui prend en considération la réaction élastique des caissons ainsi que l'accumulation du basculement permanent sous l'effet de cycles de vagues successives. La réponse élastique a été simulée en utilisant un modèle à masse ponctuelle élas-tique (lump-mass-spring). On analyse le basculement permanent des caissons sur la base de l'hypothèse du basculement du caisson sur une surface circulaire sous la base. On utilise un algorithme de recherche pour déter-miner le rayon et la profondeur du centre de rotation du cercle de glissement critique. Le basculement permanent est produit par la différence entre les moments de basculement et de stabilisation lors de la pointe des vagues, ce qui permet le cumul d'un basculement permanent au cours de pointes successives des vagues. Les études comparées avec les résultats d'essais centrifuges montrent que l'analyse est en mesure de saisir raisonnablement bien l'accumulation progressive du basculement. En outre, une comparaison avec une étude sur place de la rupture d'un caisson au cour...

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