Publication Date:
2023-08-08
Description:
Impact of solitary breaking waves on partly submerged boulders is studied experimentally in a small wave tank. Focus is on the forces and motion of boulder with different size. Furthermore, sand is added which change the friction coefficient. Experiments are conducted at the Hydrodynamics lab at the University of Oslo in a small 3m long and 10 cm wide wave tank, filled with 5 cm water.A block releasing mechanism generates solitary waves with an amplitude normalized by the water depth a/h = 0.47. The dimensions of the block are 15.03 cm, 10 cm and 5.00 cm (length, width, height). Generated solitary waves propagate to a 1:10 beach. Boulders of different size, volume and orientation are placed alternately (one at a time) at different locations on the beach slope (smooth or sandy) with respect to the wave breaking point. The transport of boulders and their motion is studied with respect to the boulder characteristics (volume, size, orientation), inclusion of sand and the initial position of the boulders. The sand on the slope changes bottom friction, and therefore, increases the boulder transport. Overall, the effects of boulders’ length (parallel to wave direction) on the displacement of boulders are more evident in this study.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
