MOTIONS OF PEBBLES ON PEBBLE BEACH

Ichiro Deguchi, Masanobu Ono, Susumu Araki, Toru Sawaragi

Abstract


Motions of pebbles on an artificial pebble beach were measured by tracking tracers. After the beach profile reached equilibrium, pebbles moved mainly in the longshore direction parallel to the shore line under the condition of oblique wave incidence. Intensive motions of pebbles were observed in the swash zone and the maximum displacement reached 30m during one week. The authors proposed a numerical procedure for analyzing pebble motion. The motion of pebble up to the maximum wave set-up point can be predicted numerically when the time and spatial variation of water particle velocity and fluid force on pebbles are given.

Keywords


pebble beach; pebble movement

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