Three-Dimensional Experimental Study of Wave-Induced Flow Around a Permeable Breakwater

摘要

The kinematics and dynamics of oscillatory flow around a pervious detached breakwater are experimentally studied for an idealized offshore permeable structure with rectangular cross-section. Laboratory measurements including wave-induced Lagrangian and Eulerian flows, and wave height distribution around structure were conducted to visualize the wave-induced flow field and its interaction with porous structure. For parametric study of the wave-induced flow, experiments were conducted with different conditions of regular water waves, porous media characteristics, and structure length. It is confirmed that there is a flow inside the pervious structure, which is expected to play an important role for natural water purification caused by the microorganisms living on the bio-film coat the surface of materials filled in structures. Also wave nonlinearity effect on the flow field was investigated to discuss the generation mechanism of the wave-induced flows.