Edge waves generated by the landslide on a sloping beach: Fid-Bau Portal

Edge waves generated by the landslide on a sloping beach

Seo, Seung-Nam / Liu, Philip L.-F.

Abstract A general solution of linear edge wave, expressed in triple integral form, is obtained for a landslide of an arbitrary shape on a uniformly sloping beach. Utilizing a reliable numerical integration package, surface elevations are computed accurately. Results for various Gaussian landslide shapes are presented by both numerical integrations and an asymptotic method along with numerical integration. Wave fields triggered by landslide motion with different shapes are strongly affected by the initial condition at the early phase but the initial difference decreases as time goes on. The effect of double quadratic finite slide on the generated wave is analyzed. Some evidences for the edge wave behavior of a dispersive water wave are obtained in the present numerical experiments.

Highlights ► We derive analytical solutions a landslide of an arbitrary shape on a uniformly sloping beach. ► The effect of both infinite and finite landslide shapes on the generated wave is presented. ► The effects of landslide initial position and its speed on the generated wave in the near and far fields are analyzed. ► The generated wave pattern at the early stage is affected by source-specific characteristics and as time goes on, the source dependent feature becomes weaker. ► Edge waves travel along coastline in the form of a packet confined to the shore.