Journal of Natural Disaster Science

EXPERIMENTAL STUDY OF THE WAVE FORCE ACTING ON ARMOUR RUBBLE OF A RUBBLE-MOUND SLOPE

Koichiro IWATA
Associate Professor, Department of Civil Engineering, Nagoya University
Yasuhiro MIYAZAKI
Civil Engineer, Kumagai-Gumi, Co. Ltd.
and
Norimi MIZUTANI
Graduate student; Department of Civil Engineering, Nagoya University

(Received 2 Sept., 1985 and in revised form 19 Dec., 1985)

Abstract

We here discuss the wave force acting on armour rubble on a rubble-mound slope based on laboratory experiments. The wave force was measured directly then decomposed into the drag and inertial forces with engineering applications in mind.

Characteristics of the total force, the drag and inertial forces, and their coefficients were investigated in relation to wave kinematics. We found that the inertial force generally cannot be neglected as compared to the drag force and that the coefficients of the drag and inertial forces in the range of K-C numbers>15 generally are smaller than those obtained for a single sphere in oscillatory flow experiments.

Key words

wave force, rubble-mound, drag force, inertia force