Open AccessLAMINAR DAMPING OF OSCILLATORY WAVES DUE TO BOTTOM FRICTION
Author(s) -
Yuichi Iwagaki,
Yoshito Tsuchiya
Publication year - 1966
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v10.10
Subject(s) - laminar flow , mechanics , attenuation , amplitude , boundary layer , physics , classical mechanics , shearing (physics) , longitudinal wave , wave propagation , optics , thermodynamics
The purpose of this paper is to discover the mechanism of the laminar damping of oscillatory waves due to bottom friction with the aid of the theory of the laminar boundary layer due to waves and of the measurements of instantaneous shearing stresses exerted on a smooth bottom, resulting from wave motion and wave amplitude attenuation with distance. In a theoretical approach the effects of convective terms involved in the basic equations of laminar boundary layers developing both on the bottom and the side walls of a wave channel, are considered on the basis of an approximate solution of the equation, and a theory of the laminar damping of Airy waves is established. In experimental studies, furthermore, direct measurements of instantaneous stresses and observations of wave amplitude attenuation were performed, and the experimental results are compared with both the above theory and the linearized one.