Next Article in Journal
Putting the “Beaver” Back in Beverley Brook: Rapid Shifts in Community Composition following the Restoration of a Degraded Urban River
Previous Article in Journal
Application of Machine Learning Techniques in Rainfall–Runoff Modelling of the Soan River Basin, Pakistan
Article

Mechanism of Tsunami-Induced Erosion of Bridge-Abutment Backfill and Its Countermeasures

1
Department of Civil and Environmental Engineering, Nagoya University, Nagoya 464-8603, Japan
2
Department of Civil Engineering and Architecture, Nagoya University, Nagoya 464-8603, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Mimikou
Water 2021, 13(24), 3529; https://doi.org/10.3390/w13243529
Received: 15 November 2021 / Revised: 7 December 2021 / Accepted: 8 December 2021 / Published: 9 December 2021
(This article belongs to the Section Oceans and Coastal Zones)
Tsunamis can destroy bridges in coastal areas. Studies have attempted to unravel the mechanism of tsunami-induced damage and develop effective countermeasures against future tsunamis. However, the mechanisms of tsunami-induced erosion of bridge-abutment backfill and its countermeasures have not been studied adequately. This study investigates this topic using numerical analysis. The results show that the tsunami flowing down along the downstream wing of the abutment induces bedload sediment transport on the ogive section of the backfill on the downstream side of the abutment, resulting in the onset of backfill erosion. Sediment suspension and bedload sediment transportation occur when the backfill inside the abutment starts to flow out from below the downstream wing. This leads to subsidence of the backfill at the upstream side of the downstream wing. The subsequent backfill erosion is mainly caused by bedload sediment transport. Numerical experiments on countermeasures show that extending the wings downward can prevent the acceleration of backfill erosion in the presence of the abutment. A combination of multiple countermeasures, including extended wings, would be more effective in maintaining the stability of the abutment after a tsunami. This suggests the application of such countermeasures to actual bridges as an effective countermeasure against backfill erosion. View Full-Text
Keywords: tsunami; bridge abutment; backfill erosion; tsunami countermeasure; numerical analysis tsunami; bridge abutment; backfill erosion; tsunami countermeasure; numerical analysis
Show Figures

Figure 1

MDPI and ACS Style

Nakamura, T.; Sugiyama, C.; Cho, Y.-H.; Mizutani, N. Mechanism of Tsunami-Induced Erosion of Bridge-Abutment Backfill and Its Countermeasures. Water 2021, 13, 3529. https://doi.org/10.3390/w13243529

AMA Style

Nakamura T, Sugiyama C, Cho Y-H, Mizutani N. Mechanism of Tsunami-Induced Erosion of Bridge-Abutment Backfill and Its Countermeasures. Water. 2021; 13(24):3529. https://doi.org/10.3390/w13243529

Chicago/Turabian Style

Nakamura, Tomoaki, Chisato Sugiyama, Yong-Hwan Cho, and Norimi Mizutani. 2021. "Mechanism of Tsunami-Induced Erosion of Bridge-Abutment Backfill and Its Countermeasures" Water 13, no. 24: 3529. https://doi.org/10.3390/w13243529

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop