THE MOTION OF COBBLES IN THE SWASH ZONE ON AN IMPERMEABLE SLOPE

Citation
Pa. Luccio et al., THE MOTION OF COBBLES IN THE SWASH ZONE ON AN IMPERMEABLE SLOPE, Coastal engineering, 33(1), 1998, pp. 41-60
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering, Civil","Engineering, Marine
Journal title
ISSN journal
0378-3839
Volume
33
Issue
1
Year of publication
1998
Pages
41 - 60
Database
ISI
SICI code
0378-3839(1998)33:1<41:TMOCIT>2.0.ZU;2-9
Abstract
The purpose of this communication is to present the results of a serie s of laboratory experiments aimed at better understanding the dynamics of the motion of large bottom particles (cobbles) in a swash zone. In this region, a thin sheet of water that results from the collapse of a turbulent bore, runs up the beach and can induce the transport of re latively large solid objects in the on-shore direction. The aims of th e study were to: (i) mimic this process in laboratory experiments and identify the associated physical processes involved and (ii) to develo p a suitable theoretical model to describe the motion of cobbles. The experiments employed a solid impermeable bottom and were conducted in a long tank of rectangular cross-section. An impulsive hydraulic bore, produced by a dam-break mechanism at one end of the tank, was used to simulate the water motion in the swash zone. Solid objects of simple discoid shape were used to model the cobbles. The results of the labor atory observations were compared with model predictions. In the range of external parameters used for the experiments (size and density of c obbles, propagation velocity and height of the water front, slope and friction at the bottom), a reasonable agreement between the measured a nd calculated values of the cobble displacement as a function of time was obtained. (C) 1998 Elsevier Science B.V.