On October 30, 2025, a research group including Professor Hidenori Takahashi won the Outstanding Paper Award for Ocean Development.

【Winner】
Masahide Otsubo (Maritime, Port and Aviation Technology Research Institute, Port and Airport Technology Research Institute)
Hideki Takahashi (Tokyo University of Marine Science and Technology, Graduate School of Marine Resources and Energy Sciences)
Dai Kurihara (Maritime, Port and Aviation Technology Research Institute, Port and Airport Technology Research Institute)
Itsuki Sato (Maritime, Port and Aviation Technology Research Institute, Port and Airport Technology Research Institute)
Tatsuya Matsuda (Toyohashi University of Technology)
Naoto Naito (Toyohashi University of Technology)
Mamoru Shiga (Ministry of Land, Infrastructure, Transport and Tourism)

[Title of award-winning research]
Damage survey of the eastern breakwater at Iida Port and centrifugal model reproduction experiment
https://doi.org/10.2208/jscejj.25-18049

[Details of award-winning research]
The 6 Noto Peninsula earthquake and subsequent tsunami damaged the eastern breakwater of Iida Port in Suzu City, Ishikawa Prefecture. Damage to the breakwater covered with wave-dissipating blocks was particularly severe, with the breakwater itself displacing and sinking significantly toward the inward side of the harbor while tilting toward the outward side. This type of damage to a breakwater due to a tsunami was unique, and its mechanism remained unclear. In this study, we analyzed on-site video footage, conducted on-site surveys including underwater drone observations, and analyzed bathymetric survey data, integrating existing borehole data to elucidate the damage mechanism. Furthermore, we attempted to reproduce the damage at the site using a centrifuge model experiment, and found that the earthquake increased pore water pressure in the clayey soil, softening the ground before the tsunami struck, resulting in the unique damage to the eastern breakwater of Iida Port.

<Related links>
Announcement of the Ocean Development Paper Award (2025)