2004 Volume 20 Pages 1187-1192
A two-dimensional laboratory experiment was conducted to investigate the movement on the nourishment-gravel composed of sand, gravel and cobble due to huge waves. As the experimental site, the on-offshore beach profile in the surveying point No.47 in the east side of Showa-hosuiro in the Fuji coast is selected. The experimental scale of horizontal and vertical lengths, and wave conditions are adopted the Froude law. The scale of sand grain size is decided by considering the similitude law of beach profile change, and similitude laws obtained the investigation results on the two-dimensional beach profile and on-offshore sand movement by waves.
In the experiment, waves in a storm event is operated for the beach model of 1/40-sacle. The movements of beach sand and nourishment-gravel, and settling under the seabed of nourishment-gravel are measured by using experimental tools of beach profiler, boring cone for taking the sample from the sub-seabed layer, and digital camera. By the arrangement of measured experimental data, it is seen that the nourishment-gravel moves rapidly into the surf zone within 30 minutes after wave operation; and after 1 hour wave operation the moved nourishment-gravel is gradually buried under the seabed by the sedimentation of moved beach sand.
