The influence of different widths of bermes upon the stability,overtopping and stress on the parapet wall of a rubble mound breakwater under the action of waves was analyzed with model testing,on the basis of which the width of the berme to armour a rubble mound breakwater was modified,thus optimizing the width of the berme.

Wave overtopping against seawalls is a complicated hydrodynamic phenomena while the overtopping discharge is one of the most important factors for safety analysis of seawalls.

to meet the requirements of overtopping and stability and cut down engineering cost.

In the view of the seawall engineering design,the paper compares and analyses the difference between the determination methods of seawall crest elevation and overtopping rate control in the current national,professional and local design standards,and put forwards the design criteria on seawall crest elevation for reference.

In this paper, the calculation of wave runup and overtopping rate related to the determination of seawall crest elevation is introduced, and the determination methods of crest elevation for seawalls in Zhejiang adopted since 1997 are analyzed.

The stability and wave overtopping rate of 3 kinds of revetments (sloping, big step and cylindrical structure types) are studied by using sectional model test.

The influences for the overtopping discharge caused by the relative height of parapet,the relative distance from water level to the toe of wall and the arc shape were analyzed.