Surface waves over a convex impedance surface

Abstract

The existence of the surface wave in an upward refracting medium has been predicted by Raspet et al. [J. Acoust. Soc. Am. 89, 107–114 (1991)]. Making use of an acoustic analogy, one is able to study the surface waves above a convex cylinder and, hence, to simulate the propagation of sound over an impedance ground in an upward refracting medium. A suitable comblike surface may be used to facilitate the generation of surface waves above the convex ground. This paper describes laboratory experiments for the observation of surface waves over a convex impedance ground.