Influence of Vertical Crown-wall on Probability Distribution of Wave Overtopping over a Sloped Seawall

Abstract:

Considering the destructive threat of the maximum individual wave overtopping volume on domestically typical sloped seawalls with crown-walls, in this research, wave flume experiments were conducted to measure the individual wave overtopping volume over the sloped seawall with the crown-wall in breaking wave conditions. Based on the empirical fitting equations for the single sloped seawall without crown-walls, influence factors of crown-walls are introduced to the empirical formula for shape factor and probability of wave overtopping probability for seawalls with crown-walls. It is concluded that the shape factor and the probability of wave overtopping are both related to the relative freeboard and the relative wall height. The shape factor increases exponentially with the increasing of the relative wall height, while the probability of wave overtopping decreases exponentially as the wall height increases. The experimental results can be taken as reference for seawall design.

Key words:wave overtopping; probability distribution of wave overtopping; probability of wave overtopping; crown-wall