Abstract
Water-level difference induced by tsunami may cause boiling in a caisson-type breakwater's mound, because it generates seepage force in there. The present study investigated a field of seepage force by numerical analyses taking into account the non-linear relation between hydraulic gradient and flow velocity. In addition, centrifuge model tests were conducted to know whether boiling occurred or not. Seepage analyses showed that the seepage force around the corner of a caisson was particularly large and it might generate boiling. The analyses indicated that the seepage force around the corner became larger and could reproduce centrifuge model tests by using the non-linear relation. The model tests using large-particle diameter stones demonstrated that boiling hardly occurred by the seepage force around the corner.
