Measurements of tsunami-borne debris impact on structures using an embedded accelerometer

Shafiei, Seyedreza; Melville, Bruce W.; Shamseldin, Asaad Y.; Beskhyroun, Sherif; Adams, Keith N.

doi:10.1080/00221686.2016.1170071

Cited by 35 publications

(17 citation statements)

References 13 publications

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“…Many researchers have conducted hydraulic physical model tests and confirmed that the magnitude of a tsunami force would be significantly increased due to the presence of debris (in this sense, a weak tsunami force and a storm surge can be somewhat similar [34][35][36]). In addition, it takes considerable effort to collect all the drifted containers (in fact, Kobe city spent 10 day to collect all of them).…”

Section: Lessons For Japanese Disaster Risk Managementmentioning

confidence: 99%

Field Survey of 2018 Typhoon Jebi in Japan: Lessons for Disaster Risk Management

et al. 2018

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Typhoon Jebi struck Japan on the 4 September 2018, damaging and inundating many coastal areas along Osaka Bay due to the high winds, a storm surge, and wind driven waves. In order to understand the various damage mechanisms, the authors conducted a field survey two days after the typhoon made landfall, measuring inundation heights and depths at several locations in Hyogo Prefecture. The survey results showed that 0.18-1.27 m inundation depths were caused by Typhoon Jebi. As parts of the survey, local residents were interviewed about the flooding, and a questionnaire survey regarding awareness of typhoons and storm surges, and their response to the typhoon was distributed. The authors also mapped the location of some of the containers that were displaced by the storm surge, aiming to provide information to validate future simulation models of container displacement. Finally, some interesting characteristics of the storm surge are summarized, such as possible overtopping at what had initially been thought to be a low risk area (Suzukaze town), and lessons learnt in terms of disaster risk management are discussed.

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Section: Lessons For Japanese Disaster Risk Managementmentioning

confidence: 99%

Field Survey of 2018 Typhoon Jebi in Japan: Lessons for Disaster Risk Management

et al. 2018

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“…The obstacle also reduced the peak onshore velocity of the debris, likely as a result of the energy lost during their rotation. Shafiei et al (2016) used a sensor-based tracking system, which recorded the accelerations of debris within dam-break flow conditions. The acceleration was then integrated over time to obtain debris velocity.…”

Section: Debris Transportmentioning

confidence: 99%

“…Based on these findings, Riggs et al (2014) did not support the use of the added mass coefficient in the evaluation of debris impact force. However, Shafiei et al (2016) performed a similar study examining the effect of the added mass coefficient with denser debris and found the peak impact force to be up to 1.5 times greater in-water than in-air. More research is needed to determine if the added mass coefficient is necessary in the design for debris impact at full scale.…”

Section: Debris Impactmentioning

confidence: 99%

“…Chanson (2006) indicated that the dam-break solution was a good representation of tsunami surge profile over a coastal plain. The application of the dam-break in an experimental setting has shown better results representing the period of a tsunami wave (Imamura et al, 2008;Al-Faesly et al, 2012;Shafiei et al, 2016), though large experimental facilities are needed to achieve these flow durations at an appropriate scale. Other techniques, such as the use of N-waves (Tadepalli and Synolakis, 1994), cnoidal waves (Synolakis et al, 1988), and pump-driven long wave generation (Goseberg et al, 2013), have been shown to better represent tsunami inundation temporal features in a variety of cases.…”

Section: Critical Review and Future Research Directionsmentioning

confidence: 99%

“…Moreover, the scaling of the plastic region of impact needs to consider the effect of debris deformation on maximum impact forces, building upon the studies by Aghl et al (2015). Other physical properties, such as the draft of the debris, also need to be considered, as was shown in Shafiei et al (2016) where the draft of the debris had a significant effect on the added mass coefficient.…”

Section: Critical Review and Future Research Directionsmentioning

confidence: 99%

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Tsunami-Driven Debris Motion and Loads: A Critical Review

Nistor

Goseberg

Stolle

2017

Front. Built Environ.

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Recent natural disasters, such as the 2004 Indian Ocean and 2011 Tohoku Tsunami, exhibited the importance of tsunami-resistant infrastructure in high-risk coastal areas. The failure of critical infrastructure in tsunami-stricken communities has led to a recent emphasis on extreme loading conditions associated with tsunami events. One of the critical loads identified by previous research was debris loads. Debris is defined as solid objects entrained within the inundating flows and can range from construction materials to shipping vessels. The emphasis of tsunami loading has led to recent progression in the understanding of debris loads and effects, particularly in evaluating the impact of a single debris piece on a structure. The following paper reviews state-of-the-art research in tsunami-driven debris motion and loads and identifies future directions of research into debris loads and effects to aid in the design of tsunami-resistant infrastructure.

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Direct measurement of the inertial drag and lift forces on entrained coarse particles at various protrusion heights

Xie

Melville

Shamseldin

et al. 2022

Earth Surf Processes Landf

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Laboratory experiments were performed to study the impact of relative particle protrusion P/D (P is the protrusion height and D is the diameter of the spherical target particle) on the entrainment of sediment particles from a rough bed of spherical grains. The target particle to be entrained was instrumented with electronic sensors to measure the triaxial linear acceleration, and consequently the particle inertial forces, during the entrainment process. The velocity field around the particle was obtained using two-dimensional particle tracking velocimetry (PTV) technique and the velocity data were synchronised with the force data relative to the moment of entrainment. Experimental results show that the inertial drag and lift forces systematically decreased as relative particle protrusion increased. The ratio of inertial lift force to drag force revealed that drag force slightly dominated the entrainment process at P/D > 0.7, while lift force slightly dominated at P/D < 0.62. Inertial drag coefficient was found to be independent of particle protrusion for low P/D, but rapidly declined for P/D > 0.62-0.7. Differently, inertial lift coefficient remained relatively constant within the tested protrusion ranges. Additionally, the critical Shields number was linearly related to the normalised inertial forces over the present particle protrusion range. In summary, the particle protrusion demonstrates a significant impact on the inertial forces and, further, the entrainment process.

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Measurements of tsunami-borne debris impact on structures using an embedded accelerometer

Cited by 35 publications

References 13 publications

Field Survey of 2018 Typhoon Jebi in Japan: Lessons for Disaster Risk Management

Field Survey of 2018 Typhoon Jebi in Japan: Lessons for Disaster Risk Management

Tsunami-Driven Debris Motion and Loads: A Critical Review

Direct measurement of the inertial drag and lift forces on entrained coarse particles at various protrusion heights

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