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.

scholarly journals Influence of Both Soil Properties and Geometric Parameters on Failure Mechanisms and Stability of Two-Layer Undrained Slopes

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Shuangfeng Guo ◽  
Ning Li ◽  
Wenpeng Liu ◽  
Zongyuan Ma ◽  
Naifei Liu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Strength Parameter ◽  
Strength Ratio ◽  
Stability Number ◽  
Parametric Studies ◽  
The Stability ◽  
Clay Slopes

The stability of the two-layer undrained clay slopes should be given considerable attention since they are commonly observed in nature and in manmade structures, and they traditionally have low stability. Therefore, with the elastoplastic finite element method, this paper thoroughly explores the influence of the soil strength parameter cu, slope angle β, and slope depth ratio DH on the slope stability and failure mechanisms by the wide-ranging parametric changes. The aims of this study are also to find the critical strength ratio (cu2/cu1)crit and the maximum values of the stability number Nc that were observed in the parametric studies. Numerical results are displayed in the form of charts to give Nc and (cu2/cu1)crit as a function of cu, β, and DH. Moreover, influences of DH and β on Nc and failure mechanisms are examined in this study. The results of numerical analysis demonstrate that cu2/cu1 significantly affects both the critical failure mechanism and the stability of the two-layer undrained slope. Improved knowledge of the location of the critical failure mechanism allows for accurately estimating the stability of the two-layer undrained slopes for future strengthening measurements to preserve stability.

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 EVALUATION OF VEGETATED DUNES FOR EROSION RESISTANCE AGAINST TSUNAMI OVERFLOW

2020 ◽  
pp. 30
Author(s):  
Kunihiro Watanabe ◽  
Fuminori Kato
Keyword(s):  
Numerical Simulations ◽  
Erosion Resistance ◽  
Sand Dunes ◽  
Hydraulic Model ◽  
Soil Samples ◽  
Root Density ◽  
Erosion Model ◽  
Model Experiments ◽  
Japanese Coast ◽  
The Relationship

A total of 14 soil samples were collected from sand dunes without scattering, and the process of tsunami-induced erosion was observed using hydraulic model experiments. The densities of vegetation roots were measured at 45 points on seven beaches along the Japanese coast. The results of the experiment confirmed that the roots of vegetation highly affected the resistance of soil against erosion. Based on this result, an erosion model based on the index alpha was proposed, and the relationship between alpha and root density was described. Then, the applicability of the proposed erosion model was investigated using numerical simulations.

Study on Failure Mechanism and Stability of Loess Slope in Huangshui River Basin

2013 ◽  
Vol 405-408 ◽  
pp. 580-586
Author(s):  
Bao Zhou ◽  
Yu Xin Zhang ◽  
Ying Sun ◽  
Cheng Ping Gan
Keyword(s):  
Slope Stability ◽  
Numerical Simulations ◽  
Failure Mechanism ◽  
River Basin ◽  
Limit Equilibrium ◽  
Loess Slope ◽  
The Stability

This paper shows the result of the research on the stability of loess high slopes with 30m and 80m in Huangshui River basin. The investigations carried out the numerical simulations of the slope stability based on the drilling and sequence sampling test in a typical loess stratum of the survey region. The result shows that the mechanisms of fracture related to the gradients of slopes are different and the limit equilibrium angles of slopes are 60° and 37° respectively.

scholarly journals HYDRAULIC MODEL EXPERIMENTS ON THE STABILITY AGAINST WAVE ACTIONS OF A BREAKWATER USING THE SUCTION FOUNDATION

2002 ◽  
Vol 18 ◽  
pp. 275-280
Author(s):  
Kenichiro SHIMOSAKO ◽  
Ryuichi FUJIWARA ◽  
Masahide NAKAGAWA ◽  
Toyokazu KURODA
Keyword(s):  
Hydraulic Model ◽  
Model Experiments ◽  
The Stability

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

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 Fast-Scale Instability and Stabilization by Adaptive Slope Compensation of a PV-Fed Differential Boost Inverter

2021 ◽  
Vol 11 (5) ◽  
pp. 2106
Author(s):  
Abdelali El Aroudi ◽  
Mohamed Debbat ◽  
Mohammed Al-Numay ◽  
Abdelmajid Abouloiafa
Keyword(s):  
Numerical Simulations ◽  
Full Range ◽  
Weather Conditions ◽  
Current Loop ◽  
Point Tracking ◽  
Bifurcation Phenomena ◽  
Slope Compensation ◽  
Power Point ◽  
The Stability ◽  
Detailed Circuit

Numerical simulations reveal that a single-stage differential boost AC module supplied from a PV module under an Maximum Power Point Tracking (MPPT) control at the input DC port and with current synchronization at the AC grid port might exhibit bifurcation phenomena under some weather conditions leading to subharmonic oscillation at the fast-switching scale. This paper will use discrete-time approach to characterize such behavior and to identify the onset of fast-scale instability. Slope compensation is used in the inner current loop to improve the stability of the system. The compensation slope values needed to guarantee stability for the full range of operating duty cycle and leading to an optimal deadbeat response are determined. The validity of the followed procedures is finally validated by a numerical simulations performed on a detailed circuit-level switched model of the AC module.

scholarly journals Earth-size planet formation in the habitable zone of circumbinary stars

2020 ◽  
Vol 494 (1) ◽  
pp. 1045-1057 ◽  
Author(s):  
G O Barbosa ◽  
O C Winter ◽  
A Amarante ◽  
A Izidoro ◽  
R C Domingos ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Planet Formation ◽  
Terrestrial Planet ◽  
Close Binary ◽  
Habitable Zone ◽  
Density Profiles ◽  
Habitable Planets ◽  
Habitable Zones ◽  
Test Particles ◽  
The Stability

ABSTRACT This work investigates the possibility of close binary (CB) star systems having Earth-size planets within their habitable zones (HZs). First, we selected all known CB systems with confirmed planets (totaling 22 systems) to calculate the boundaries of their respective HZs. However, only eight systems had all the data necessary for the computation of HZ. Then, we numerically explored the stability within HZs for each one of the eight systems using test particles. From the results, we selected five systems that have stable regions inside HZs, namely Kepler-34,35,38,413, and 453. For these five cases of systems with stable regions in HZ, we perform a series of numerical simulations for planet formation considering discs composed of planetary embryos and planetesimals, with two distinct density profiles, in addition to the stars and host planets of each system. We found that in the case of the Kepler-34 and 453 systems, no Earth-size planet is formed within HZs. Although planets with Earth-like masses were formed in Kepler-453, they were outside HZ. In contrast, for the Kepler-35 and 38 systems, the results showed that potentially habitable planets are formed in all simulations. In the case of the Kepler-413system, in just one simulation, a terrestrial planet was formed within HZ.

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