Experimental Study on Embankment Reinforcement by Steel Sheet Pile Structure Against Tsunami Overflow

Mitobe, Yuta; Adityawan, Mohammad Bagus; Roh, Min; Tanaka, Hitoshi; Otsushi, Kazutaka; Kurosawa, Tatsuaki

doi:10.1142/s0578563416400180

Cited by 17 publications

(6 citation statements)

References 11 publications

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“…As a preliminary investigation of debris damming, the transient nature of coastal flooding was not considered herein. However, comparing to tsunamis, the time scale of the local flow conditions, in field studies of tsunami-stricken areas, (~7 min at prototype scale) is significantly shorter than the tsunami wave period (>10 min) [38]. The flow velocities at prototype scale (2-7 m/s) in these tests compared well to the velocities observed in the 2004 Indian Ocean Tsunami (2-5 m/s) [39].…”

Section: Debris Geometrysupporting

confidence: 53%

“…The cases with a single shipping container consistently formed a dam with similar characteristics and loads, whereas the characteristics of the hydro pole and boards varied between trials. Bocchiola et al [38] discussed the importance of the "key" log in the formation of a debris dam. The "key" log refers to the first object to get caught on the obstacle and initiates the formation of the dam.…”

Section: Debris Geometrymentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of Debris-Induced Loading in Tsunami-Like Flood Events

et al. 2017

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Debris loads during flood events have been well-documented by forensic engineering field surveys of affected communities. Research has primarily focused on debris impact loading and less emphasis has been placed into quantifying the loads and effects associated with debris damming, which occurs when solid objects accumulate at the front of structures. The formation of the debris dam has been shown to results in increased drag forces, backwater rise, and flow accelerations which can influence the stability of the structure. This study examined the formation of a debris dam in steady-state conditions of debris common to flood-prone communities. The study determined that the hydraulic conditions, in particular flow velocity, influenced the formation of the debris dam. Additionally, the study examined the influence of the blockage ratio on the backwater rise as well as the drag coefficient.

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Section: Debris Geometrysupporting

confidence: 53%

Section: Debris Geometrymentioning

confidence: 99%

Experimental Investigation of Debris-Induced Loading in Tsunami-Like Flood Events

et al. 2017

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“…Sheet piles and concrete screens in the crestline improve the stability of the dike and help controlling seepage [1,6]. In case of an overflow or overtopping event and consequent erosion of the landside slope, the height of the dike and with this the flood protection function are still ensured when applying sheet piles [101].…”

Section: Overviewmentioning

confidence: 99%

Enhancing the Ecological Value of Sea Dikes

Scheres¹,

Schüttrumpf²

2019

Water

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Sea dikes protect low-lying hinterlands along many coasts all around the world. Commonly, they are designed as embankments with grass covers or grey revetments accounting for the prevailing hydraulic loads. So far, incorporation of ecological aspects in the dike design is limited. With regard to increasing environmental awareness and climate change adaptation needs, the present study reviews methods for ecological enhancement of sea dikes and discusses limitations and challenges related to these methods. In doing so, one key aspect is to maintain dike safety while increasing the ecological value. Potential for ecological enhancement of sea dikes has been found regarding natural or nature-based solutions in the foreshore, dike surface protection measures (vegetated dike covers, hard revetments and dike roads) and the dike geometry. While natural and nature-based solutions in the foreland are investigated thoroughly, so far only few experiences with ecological enhancements of the dike structure itself were gained resulting in uncertainties and knowledge gaps concerning the implementation and efficiency. Additional to technical uncertainties, engineers and ecologists meet the challenge of interdisciplinary collaboration under consideration of societal needs and expectations.

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“…A significant onsite evaluation was carried out by Hou et al [18] at a major dock project in Shanghai, assessing the deformation characteristics of a large-span DSSP cofferdam. Investigations into DSSP efficacy against tsunami impacts were undertaken by Furuichi et al [6] and Mitobe et al [19], who demonstrated superior resistance of double-walled configurations in flume tests. Zhu et al [20] applied the Bayesian approach to enhance the reliability assessment of DSSPs, integrating both statistical and field data effectively.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Cofferdam with Double-Wall Steel Sheet Piles under Wave Action from Storm Surges

Zhu,

Bi,

Xing

et al. 2024

Water

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Double-wall steel sheet piles (DSSPs) are widely used in large-span cofferdams for docks due to their good performance against wave action during storm surges. This paper describes a study of the dynamic behavior of a DSSP cofferdam under wave action through flume tests and a numerical simulation that combined computational fluid dynamics (CFD) and the finite element method. The influences of the water level and wave height on the DSSP cofferdam were investigated experimentally and numerically. Tall waves in shallow water broke upon and impacted the seaside pile with large dynamic wave pressure, dramatically increasing the stress and displacement of the seaside pile. The overlap of the traveling and reflected waves increased the excess pore water pressure near the seaside pile due to taller overlapped waves and higher wave frequency. The DSSP cofferdam failed under the combined actions of the dynamic wave pressure and erosion of the landside seabed. The leakage and overflow of the breaking waves resulted in significant erosion of the landside seabed and greatly weakened the support of the seabed. The dynamic wave pressure then pushed the DSSP cofferdam until it failed. The simulation with the combined methods of CFD and FEM resulted in trends that were similar to those of the test measurements. Compared to the quasi-static method and pseudo-dynamic method, the results of the simulation via the present method were much closer to the test results because the simulation included the effects of breaking waves. The reinforced measure worked well to prevent the DSSP cofferdam in a sandy seabed foundation from continuous failures of deformation–leakage–erosion–tilting. However, it failed in a clay interlayer seabed foundation due to the large settlement.

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Experimental Study on Embankment Reinforcement by Steel Sheet Pile Structure Against Tsunami Overflow

Cited by 17 publications

References 11 publications

Experimental Investigation of Debris-Induced Loading in Tsunami-Like Flood Events

Experimental Investigation of Debris-Induced Loading in Tsunami-Like Flood Events

Enhancing the Ecological Value of Sea Dikes

Stability Analysis of Cofferdam with Double-Wall Steel Sheet Piles under Wave Action from Storm Surges

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