Waves Caused by a Moving Disturbance in a Shallow Channel of Finite Width

摘要

The flow created by an impulsively pressure distribution traveling at a constant velocity in a shallow channel is investigated. The restricted Green-Naghdi theory of fluid sheets is used to perform the three-dimensional calculations. The results show remarkable similarity to model tests. In particular, those calculations predict the periodic generation of two-dimensional solitons in front of and traveling faster than the disturbance if the disturbance is large enough. Behind the disturbance a complicated doubly corrugated set of waves is formed. The computations also predict that periodic creation of solitons is accompanied by a correspondingly periodic oscillation of the wave drag as well as a dramatic increase in the mean wave drag. Keywords: Water waves; Ship models; Reprints. (EDC)