偏微分方程式セミナー A mathematical analysis of tsunami generation in shallow water due to seabed deformation

開催日時
2009年   06月 02日 16時 30分 ~ 2009年   06月 02日 17時 30分
場所
北大理学部3号館205室
講演者
井口達雄 (慶応義塾大学)
 
In numerical simulation of tsunamis due to submarine earthquakes,one usually uses the shallow water equations by assuming that the initial displacement of water surface is equal to the permanent deformation of seabed and that there is no initial velocity field. In this talk, starting from the full water wave problem (a free boundary problem for an irrotational flow of an incompressible ideal fluid under the gravitational field) we derive mathematically rigorously the shallow water model mentioned above, that is, we will show that the solution of the full waterwave problem can be approximated by the solution of the shallow water model in some limits of parameters. Moreover, we report that in some case we have to take some initial velocity field, which arises as a nonlinear effect, into account as initial data.

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