When the wave overtopping exceeds the critical value,the secondary waves generated behind the breakwater will pose a safety threat to the rear facilities (such as pile-supported wharves).To ensure the structural safety of pile-supported wharves under overtopping conditions,it is necessary to reassess the wave-induced forces acting on the wharf structure.In response to the problem of the current research gap concerning the calculation of uplift forces caused by secondary waves on panels of pile-supported wharves,the wave-induced uplift forces under overtopping conditions are investigated in this paper.A physical wave model test is established to examine the wave distribution within the harbor and the corresponding wave loads on the wharf,focusing on the combined effects of secondary waves generated by wave overtopping and diffracted waves entering the harbor around the breakwater head.The test results are compared with the calculation results by empirical formulas from design code.The fundamental reasons for the overestimation and limited applicability of the code formulas is identified by analyzing the characteristics of wave trains after overtopping.The results show that the measured maximum total uplift force on the wharf panel caused by secondary waves is approximately 50% of the value predicted by the empirical formulas,indicating significant safety redundancy.It is recommended that when calculating the maximum total uplift forces of secondary waves after overtopping,a breaking wave reduction coefficient of 0.5-0.7 should be introduced on the basis of the code formulas.