scholarly journals MECHANISMS OF COASTAL DIKE FAILURE INDUCED BY THE GREAT EAST JAPAN EARTHQUAKE TSUNAMI

2012 ◽  
Vol 1 (33) ◽  
pp. 40 ◽  
Author(s):  
Fuminori Kato ◽  
Yoshio Suwa ◽  
Kunihiro Watanabe ◽  
Satoshi Hatogai
Keyword(s):  
Hydraulic Model ◽  
Great East Japan Earthquake ◽  
Failure Pattern ◽  
Field Surveys ◽  
Model Experiments ◽  
Failure Patterns ◽  
Dike Failure

Based on the results of field surveys, coastal dike failures caused by the Great East Japan Earthquake were classified into eight patterns. The results of hydraulic model experiments related to major failure patterns reinforced the proposed failure processes. In addition, the aggregated length of each failure pattern showed that failure from scouring at the landward toe is the dominant failure pattern.

scholarly journals FAILURE MECHANISM OF KAMAISHI BREAKWATERS DUE TO THE GREAT EAST JAPAN EARTHQUAKE TSUNAMI

2012 ◽  
Vol 1 (33) ◽  
pp. 16 ◽  
Author(s):  
Taro Arikawa ◽  
Masaharu Sato ◽  
Kenichiro Shimosako ◽  
Iwao Hasegawa ◽  
Gyeong-Seon Yeom ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Hydraulic Model ◽  
Great East Japan Earthquake ◽  
Model Experiments ◽  
The Subject ◽  
The Stability

Many breakwaters were damaged by the Great East Japan Earthquake of March 11, 2011. The majority of the breakwaters were destroyed or deformed under tsunami overflow; however, the failure mechanism under tsunami overflow is not clear. Therefore, with the main objective of this report being to clarify the stability of breakwaters under tsunami overflow, hydraulic model experiments and numerical simulations were conducted with Kamaishi Bay breakwaters as the subject, and failure mechanisms of the trunk of the breakwaters were examined.

HYDRAULIC MODEL EXPERIMENTS TO UNDERSTAND INFLUENCE OF UPCOAST STRUCTURES ON MEASURES AGAINST CLOGGING OF THE MOTOFUJI CALVERT

2019 ◽  
Vol 75 (2) ◽  
pp. I_541-I_546
Author(s):  
Masaki IKEDA ◽  
Hiroshige MATSUMOTO ◽  
Fumiaki ITO ◽  
Satoshi HENMI ◽  
Go ASANO
Keyword(s):  
Hydraulic Model ◽  
Model Experiments

scholarly journals WAVE REDUCTION EFFECT OF HYDROPLANE TSUNAMI BARRIER IN TERMS OF HYDRAULIC MODEL EXPERIMENTS

2015 ◽  
Vol 71 (2) ◽  
pp. I_1081-I_1086
Author(s):  
Ryoukei AZUMA ◽  
Tadao ITO ◽  
Hideaki HANDA ◽  
Tetsuya HIRAISHI ◽  
Takahiro SUGANO
Keyword(s):  
Hydraulic Model ◽  
Model Experiments ◽  
Reduction Effect ◽  
Wave Reduction

scholarly journals Modeling Tsunami-Induced Erosion of Bridge-Abutment Backfill

2020 ◽  
Vol 8 (11) ◽  
pp. 922
Author(s):  
Tomoaki Nakamura ◽  
Yuto Nakai ◽  
Yong-Hwan Cho ◽  
Norimi Mizutani
Keyword(s):  
Numerical Simulation ◽  
Soil Cover ◽  
Coastal Areas ◽  
Hydraulic Model ◽  
Numerical Analyses ◽  
Conical Part ◽  
Model Experiments ◽  
Cover Depth ◽  
Bridge Abutment

Tsunamis can seriously damage bridges in coastal areas. Studies of such damage have elucidated the action of tsunami-induced forces on girders. However, tsunami-induced erosion of bridge-abutment backfill has been largely neglected. This article investigates this little-studied topic using hydraulic model experiments and numerical analyses. The results show that a tsunami erodes the backfill close to the abutment; the scale of the erosion increases with the duration of the tsunami. By contrast, the backfill on the far side of the abutment remains relatively intact. This suggests that the presence of the abutment accelerates the erosion of the backfill in its vicinity. A numerical simulation shows that the tsunami erodes the oval conical part of the backfill on the landward side of the onshore wing. When the erosion reaches the lower end of the wing the backfill begins to flow out from underneath. Thus, an increase in the soil-cover depth of the onshore wing might help slow down the erosion.

Wear Out Failure Patterns and Their Interpretation

1980 ◽  
Vol 22 (3) ◽  
pp. 143-151 ◽  
Author(s):  
A. D. S. Carter
Keyword(s):  
Fatigue Strength ◽  
Failure Rate ◽  
Initial Period ◽  
Failure Pattern ◽  
Weibull Distributions ◽  
Increasing Failure Rate ◽  
Failure Patterns ◽  
Loss Of Strength ◽  
Continuous Loss

It is shown theoretically that fatigue of a component will result in a failure pattern which consists of an initial period of intrinsic reliability, or near zero failures, followed by a rapid increase in failure rate when loss of fatigue strength becomes operative, to be followed in turn by a period during which the failure rate decreases with time or maybe remains constant. By contrast other wear-out modes involving a continuous loss of strength give rise to a steadily increasing failure rate after the period of intrinsic reliability has expired. Practical examples of each type are quoted to substantiate the theoretical deductions. The interpretation of wear out characteristics by Weibull distributions is discussed.

scholarly journals Performance Evaluation of Hydroplane Tsunami Barrier by Means of Small Hydraulic Model Experiments

2014 ◽  
Vol 70 (2) ◽  
pp. I_951-I_955
Author(s):  
Ryoukei AZUMA ◽  
Tadao ITO ◽  
Hideaki Handa ◽  
Ryo Yamashiki ◽  
Tetsuya HIRAISHI ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Hydraulic Model ◽  
Model Experiments

scholarly journals Hydraulic Model Experiments on the Reduction of Wave Overtopping by the Integrated Shore Protection Facility Planned near Natural Rocky Beaches

2013 ◽  
Vol 69 (2) ◽  
pp. I_296-I_300
Author(s):  
Kenji UESHIMA ◽  
Masaharu MINAMI ◽  
Masahiko KOGA ◽  
Hideyuki SHIMAZOE ◽  
Yasuhiro NISHII ◽  
...  
Keyword(s):  
Hydraulic Model ◽  
Shore Protection ◽  
Wave Overtopping ◽  
Model Experiments
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