Sliding stability analysis of emerged quarter circle breakwater with varying seaside perforations

Abstract

In the present study, an attempt has been made to study the sliding stability of seaside perforated Quarter circle breakwater (QBW) models. Experiments were conducted in a 2D monochromatic wave flume to study the minimum (critical) weight required to resist the sliding of emerged seaside perforated quarter circle breakwater models with radius 0.55 m and ratio of spacing to diameter of perforations (S/D) equal to 2, 2.5, 3, 4 and 5. From the results it was observed that the non-dimensional stability parameter (W/γH_i²) is always decreasing with the increase in wave steepness, H_i/gT², but increasing with increase in ratio of water depth to height of the breakwater structure or relative water depth (d/h_s) and S/D. Minimum W/γH_i² was observed corresponding to S/D=2.5 and d/h_s= 0.569.