Abstract
There are few studies investigating runup heights of random waves on seawalls near shoreline. The present study proposed an estimation formula of random wave runups for seawalls in the region of shallow foreshore or above shoreline, by carrying out hydraulic experiments. In the formula, deep water wave characteristics and a revised imaginary slope, considering the actual composite beach cross section, are employed in order to determine the surf similarity parameter. Several existing formulas were also examined for their applicability; in the formulas, wave characteristics at the toe of seawall were used, and other definitions of the slope were reported for composite cross sections. It was found that the applicability of existing runup formulas were limited to small range of surf similarity parameter. The present proposed formula can be employed for a wide range corresponding to the present experimental results.
