Band-gap structure of the spectrum of the water-wave problem in a shallow canal with a periodic family of deep pools

Autor: Sergei A. Nazarov, Jari Taskinen
Přispěvatelé: Department of Mathematics and Statistics
Rok vydání: 2022
Předmět:
Zdroj: Revista Matemática Complutense. 36:263-299
ISSN: 1988-2807
1139-1138
Popis: We consider the linear water-wave problem in a periodic channel $$\Pi ^h \subset {{\mathbb {R}}}^3$$ Π h ⊂ R 3 , which is shallow except for a periodic array of deep potholes in it. Motivated by applications to surface wave propagation phenomena, we study the band-gap structure of the essential spectrum in the linear water-wave system, which includes the spectral Steklov boundary condition posed on the free water surface. We apply methods of asymptotic analysis, where the most involved step is the construction and analysis of an appropriate boundary layer in a neighborhood of the joint of the potholes with the thin part of the channel. Consequently, the existence of a spectral gap for small enough h is proven.
Databáze: OpenAIRE
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