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Field Observations of the Build-Up and Dissipation of Residual Pore Water Pressures in Seabed Sands Under the Passage of Storm Waves

S. Sassa, T. Takayama, M. Mizutani and D. Tsujio
Journal of Coastal Research
Special Issue No. 39. Proceedings of the 8th International Coastal Symposium (ICS 2004), Vol. I (Winter 2006), pp. 410-414
Stable URL: http://www.jstor.org/stable/25741606
Page Count: 5
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Abstract

The purpose of this study was to clarify the nature of instability in a seabed of fine-grained sands under the action of storm waves. The paper describes the methodology and the results of systematic field measurements performed of the changes in pore water pressures in the seabed sands at Kouchi port, Japan during the period of six days involving the passage of Typhoon No.9, 2002. It was found that there occurred the build-up in the residual pore pressures at various sand depths shallower than 2.0m when the significant wave heights were greater than 2.0m. The observed data was further examined by means of the frequency spectral analysis and of the time domain coupled elastoplastic finite-element analysis. The results show that the process of the seabed instability was closely related to the wave grouping characteristics which manifested in the field concerned.

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