Centrifuge modelling of breaking waves and seashore ground

Author:

Takahashi Hidenori1ORCID,Morikawa Yoshiyuki2,Kashima Hiroaki3

Affiliation:

1. Head of Group, Soil Stabilization Group, Geotechnical Engineering Division, Port and Airport Research Institute, MPAT, Yokosuka, Japan (corresponding author: )

2. Director of Division, Geotechnical Engineering Division, Port and Airport Research Institute, MPAT, Yokosuka, Japan

3. Deputy Director, Ports and Harbours Bureau, Ministry of Land, Infrastructure, Transport and Tourism, Tokyo, Japan (Formerly of Coastal and Ocean Engineering Division, Port and Airport Research Institute, MPAT)

Abstract

Seashore ground stability is a crucial issue in the composite problems of hydraulics and geotechnics. Many studies have been conducted on covering materials and sediment transport. However, very few studies have examined this issue from a geotechnical viewpoint. This is because the ground displays complicated responses against breaking waves, and because it is difficult to examine ground behaviours through a prototype-scale model test. The physical modelling of breaking wind waves and seashore ground helps explain ground stability. This study examined the efficacy of centrifuge modelling with regard to this issue. The authors showed the similarity laws, including fluid behaviours and developed a new wave generator. The centrifuge model efficacy was verified mainly by way of the modelling of model tests on waveform, wave height and water pressure on and in the ground. Additional tests indicated that excess pore-water pressure was generated due to wave set-up. Increasing the wave height and/or wave frequency caused a seepage force, which could decrease ground stability.

Publisher

Thomas Telford Ltd.

Subject

Geotechnical Engineering and Engineering Geology

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1. Backfilling configuration to improve tenacity of composite-type breakwaters;Coastal Engineering Journal;2023-01-31

2. Destabilisation of seawall ground by ocean waves;Géotechnique;2022-08-16

3. Centrifuge modelling of wave-induced seabed response in clay;Géotechnique;2022-05-25

4. OVERFLOW TESTS OF COASTAL LEVEE REINFOCED BY DEEP MIXING METHOD;Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering);2021

5. Award-winning paper in 2019;International Journal of Physical Modelling in Geotechnics;2021-01

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