SASSA Shinji

J-GLOBAL         Last updated: Oct 1, 2019 at 08:46
SASSA Shinji
National Institute of Maritime, Port and Aviation Technology, Port and Airport Research Institute
Job title
Head of Soil Dynamics Group and Research Director
Doctor of Engineering

Research Areas


Academic & Professional Experience

Apr 2012
Head of Soil Dynamics Group and Research Director, International Research Center for Coastal Disasters, Port and Airport Research Institute, National Institute of Maritime, Port and Aviation Technology


Civil Engineering, Graduate School, Division of Engineering, Kyoto University
Civil Engineering, Faculty of Engineering, Kyoto University

Committee Memberships

Chair, International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) TC213 on Scour and Erosion
Associate Editor, Soils and Foundations
Editor, Landslides: Submarine Landslides. Liquefied Flows and Tsunami
Editor, Geotechnical Engineering Journal, Offshore and Coastal Geotechnics

Awards & Honors

Special Prize for Infrastructure Maintenance Award, Technological Development for Suppressing Washout/Internal Erosion and Cavity Collapse
Commendation by the Prime Minister for Disaster Prevention Merit as a representative of Technical Emergency Control Force
Commendation by the Minister of Land, Infrastructure, Transport and Tourism as a representative of Technical Emergency Control Force
Outstanding Reviewer, Coastal Engineering
Outstanding Reviewer, Journal of Rock Mechanics and Geotechnical Engineering
Outstanding Reviewer, Applied Ocean Research
Liquefaction Prediction and Assessment Paper: Top-Read Paper in ASCE Most Read Articles
Ouststanding Review Award, Japan Society for the Promotion of Science
Best Technological Development Award, Japanese Geotechnical Society
Outstanding Research Accomplishment Award, Japanese Geotechnical Society


Liquefied gravity flow-induced tsunami: first evidence and comparison from the 2018 Indonesia Sulawesi earthquake and tsunami disasters
Sassa, S. and Takagawa, T.
Landslides   16(1) 195-200   Jan 2019   [Refereed]
Role of geoenvironmental dynamics in the biodiversity of sandy beaches and sandflats: The ecohabitat chart and its ecological implications
Sassa, S. and Yang, S.
Estuarine, Coastal and Shelf Science   219 278-290   Feb 2019   [Refereed]
Suction-induced habitat selection in sand bubbler crabs
Sassa, S. and Yang, S
Royal Society Open Science   6    May 2019
Fate of benthic invertebrates during seabed liquefaction: quantitative comparison of living organism body density with liquefied substrate density
Seike, K., Sassa, S., Kubota, K. and Shirai, K.
Estuarine, Coastal and Shelf Science   223 1-5   Apr 2019   [Refereed]
Centrifuge model tests of earthquake-induced submarine landslides
Takahashi, H., Fujii, N. and Sassa, S.
International Journal of Physical Modelling in Geotechnics   in press 
Universality of the linkage between geoenvironment and the distributions of three Haustorioides amphipods: H. japonicus, H. munsterhjelmi, and H. koreanus
Soonbo Yang, Shinji Sassa, Yoshitake Takada
Plankton and Benthos Research   14(3) 170-179   Aug 2019   [Refereed]
Wave-induced liquefaction and floatation of a pipeline in a drum centrifuge
Miyamoto, J., Sassa, S., Tsurugasaki, K. and Sumida, H.
Journal of Waterway, Port, Coastal and Ocean Engineering   in press    [Refereed]
Liquefaction assessment of sand in sequenced seismic motions
Kobayashi, T. and Sassa, S.
International Journal of Offshore and Polar Engineering   28(4) 1-7   Oct 2018
Koji Seike, Shinji Sassa, Kotaro Shirai, Kaoru Kubota
Journal of Geophysical Research: Oceans   123(2) 1376-1392   Feb 2018   [Refereed]
© 2018. The Authors. Although tsunami sedimentation is a short-term phenomenon, it may control the long-term benthic environment by altering seafloor surface characteristics such as topography and grain-size composition. By analyzing sediment core...
Akio Tamaki, Takumi Kagesawa, Seiji Takeuchi, Hirofumi Ohashi, Soonbo Yang, Shinji Sassa
Marine Biology   165    Feb 2018
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature. Species of the free-burrowing amphipod genus, Urothoe, are common on open sandy beaches. On intertidal sandflats, some species are associated with burrows or tubes of large infauna. Ho...
Kanji Takenouchi, Shinji Sassa, Hiroyuki Yamazaki, Takeshi Konishi, Takashi Shinsaka, Yuichi Kanno, Hiroshi Okada, Tadashi Takahashi
Geotechnical Special Publication   2018-March 283-293   Jan 2018
© 2018 American Society of Civil Engineers (ASCE).All Rights Reserved. The compaction grouting (CPG) method is one of the liquefaction mitigation methods. Because the CPG method can be applied below or near the existing structures, there are many ...
Akio Tamaki, Takumi Kagesawa, Seiji Takeuchi, Shinji Sassa
Acta Zoologica      Jan 2018
© 2018 The Royal Swedish Academy of Sciences. Species of the gammaridean amphipod genus, Urothoe, commonly occur on intertidal and shallow subtidal sandy bottoms. Sexual dimorphism is reported for some species of Urothoe, but the descriptions are ...
Yoichi Watabe, Shinji Sassa, Takashi Kaneko, Yukio Nakata
Soils and Foundations   57 760-775   Oct 2017
© 2017 Coral gravel soils are composite soils comprised of large fragments of finger coral and fine particles from silt matrixes. When the amount of coral fragments is small, the mechanical behavior of the coral gravel soil is mainly governed by t...
Shinji Sassa, Hiroyuki Yamazaki
Journal of Geotechnical and Geoenvironmental Engineering   143(2) 04016091   Feb 2017   [Refereed]
Shinji Sassa, Hidenori Takahashi, Yoshiyuki Morikawa, Daiki Takano
Coastal Engineering   117 157-165   Nov 2016   [Refereed]
© 2016 Elsevier B.V. In this study, a new tsunami overflow-seepage-coupled centrifuge experimental system was developed and applied to investigate the concurrent processes, and to elucidate the mechanism, of the instability involving the scour of ...
Yoichi Watabe, Shinji Sassa
Journal of Coastal Research   32 1389-1401   Nov 2016
© 2016 Coastal Education and Research Foundation, Inc. Watabe, Y. and Sassa, S., 2016. Sedimentation history of sandbars in flood-tidal delta evaluated by seismic method in Lake Tofutsu, Japan. An extensive pattern of sandbars within a flood-tidal...
Yoichi Watabe, Shinji Sassa, Takashi Kaneko, Yukio Nakata
Soils and Foundations   55(5) 1233-1242   Oct 2015   [Refereed]
© 2015 Japanese Geotechnical Society. Coral gravel soils, which are composite soils consisting of finger-coral fragments and silt matrix, are often found in coastal regions of sub-tropical islands. In this study, for reconstituted soils with vario...
Hidenori Takahashi, Shinji Sassa, Yoshiyuki Morikawa, Daiki Takano, Kenji Maruyama
Soils and Foundations   54(4) 789-805   Jan 2014
© 2014 Japanese Geotechnical Society. A tsunami-induced difference between the water levels of the seaward and the landward sides of breakwaters generates one-way seepage in the rubble foundation under the breakwaters. Such seepage may decrease th...
S. Sassa
Geotechnical Engineering   45(4) 102-107   Jan 2014
The paper reports some recent research advances on tsunami-seabed-structure interaction following the 2011 off the Pacific Coast of Tohoku Earthquake Tsunami, Japan. It presents a concise review of the latest research performed on the stability of...
S. Sassa, Y. Watabe, S. Yang, T. Kuwae
Soils and Foundations   53(2) 246-258   Jan 2013
The present study aims to pioneer a new cross-disciplinary research field which we call "Ecological Geotechnics". Recent findings about the salient geophysics involved in intertidal sediments made it possible to closely investigate the linkage bet...
Yoshitake Takada, Naoto Kajihara, Shinji Sassa
Plankton and Benthos Research   8(4) 195-198   2013
© The Japanese Association of Benthology. Relationships between the sediment hardness and the upper distribution limit of the burrowing amphipod Haustorioides japonicus were examined on 18 sandy shores in Niigata and Toyama prefectures, on the Jap...
F. Yamada, N. Kobayashi, Y. Shirakawa, Y. Watabe, S. Sassa, A. Tamaki
Journal of Waterway, Port, Coastal and Ocean Engineering   138 172-180   Mar 2012
Fine-grained sediment budgets based on the monthly bed level and net sediment flux monitoring from October 2006 to October 2007 are estimated to examine the relative contributions of tides and river discharge to mud transport on an intertidal flat...
Yoichi Watabe, Shinji Sassa
Soils and Foundations   52(3) 411-429   Jan 2012
Intertidal flats are key elements in marine environments; they provide regions of rich bioactivity and also have the function of water purification. In the present study, the shear wave velocity structures of intertidal flats were explored by a su...
Shinji Sassa, Hideo Sekiguchi
Submarine Mass Movements and Their Consequences - 5th International Symposium   405-416   Jan 2012
This paper describes an extension of the computational code LIQSEDFLOW. The salient features of the code lie in the capabilities to describe the multi-phased physics of subaqueous sediment gravity flows. Specifically, it combines Navier-Stokes/con...
Shinji Sassa, Yoichi Watabe, Soonbo Yang, Tomohiro Kuwae
PLoS ONE   6(9)    Sep 2011
The response of bivalves to their abiotic environment has been widely studied in relation to hydroenvironmental conditions, sediment types and sediment grain sizes. However, the possible role of varying geoenvironmental conditions in their habitat...
Yoichi Watabe, Shinji Sassa
Geotechnical Special Publication   1013-1022   Dec 2010
A significant development of sandbars can be seen at the entrance of Lake Tofutsu, one of the lagoons located along the Okhotsk Sea in Hokkaido, Japan. The purpose of this study is to investigate the sequential sedimentation history of these sandb...
Shinji Sassa, Hideo Sekiguchi
Soils and Foundations   50(4) 495-504   Dec 2010
Tomohiro Kuwae, Eiichi Miyoshi, Shinji Sassa, Yoichi Watabe
Marine Ecology Progress Series   406 281-289   May 2010
Predators may have a series of alternative foraging modes. Under the food resource maximization hypothesis, predators are expected to shift between foraging modes such that they attain the highest intake rate in response to prey availability and c...
SASSA Shinji, WATABE Yoichi
Geophysical Research Letters   36(1) 1404   Jan 2009
The persistent nature of intertidal sand bars has been the subject of much speculation concerning the hydrodynamic mechanisms involved, but its origin remains enigmatic. Here, we introduce salient geophysics in contrast to the physics of fluids ab...
Yoichi Watabe, Shinji Sassa
Marine Geology   252(3-4) 79-88   Jul 2008
Intertidal flats are key elements in marine environments; they consist of regions with rich bioactivity and also contribute to water purification. Recently, it has been demonstrated that benthic activities in intertidal flats are closely related t...
SASSA Shinji, WATABE Yoichi
Marine Ecology Progress Series   354 191-199   Feb 2008
The role of physical processes in sediments in the response of macroinfauna remains largely unknown, in contrast to the role of waves and swash conditions. This study was motivated by our recent finding on the physics involved in intertidal sedime...
SASSA Shinji, WATABE Yoichi
Journal of Geophysical Research   112(F1) 1003-1003   Mar 2007
In this paper we present and discuss the role of the dynamics of suction, that is, negative pore water pressure relative to atmospheric air pressure, in the evolution of intertidal sandy flats. This is done through the combined use of field eviden...
Amiruddin, Hideo Sekiguchi, Shinji Sassa
Norwegian Journal of Geology   86 285-293   Dec 2006
The flow-out potential of a body of fluidized sediment following abrupt collapse is discussed through numerical and physical modelling. The emphasis of the analysis procedure is placed on considering density stratification that occurs in highly co...
Amiruddin, Sassa S., Sekiguchi H.
ASCE Geotechnical Special Publication   (156) 500-514   Dec 2006
Field observations of the build-up and dissipation of residual pore water pressures in seabed sands under the passage of storm waves
Journal of Coastal Research   Special Issue 39 410-414   2006
Shinji Sassa, Fengying Li, Hideo Sekiguchi
ASCE Geotechnical Special Publication   143 174-186   Jun 2005
This study was motivated by a recent case history of the formation and collapse of cavities in unsaturated granular backfill behind a seawall. It aims at developing a framework to assess the role of suction in the performance of granular soils sub...
J. Miyamoto, S. Sassa, H. Sekiguchi
Geotechnique   54 617-629   Jan 2004
A theoretical model for progressive solidification is described. It reproduces the experimental finding, from centrifugal wave tank testing with viscous scaling, that a layer of liquefied sand solidifies progressively from the base up while severe...
In Submarine Mass Movements and their Consequences (eds. J. Locat and J. Mienert), Advances in Natural and Technological Hazards Research 19, Kiuwer Academic Publishers   19 95-102   2003
Geotechnique   51(2) 115-126   2001
S. Sassa, H. Sekiguchi
Geotechnique   49(5) 621-638   Jan 1999