Abstract
Regular wave data over the shallow reef with steep slope were analyzed using data of experiments conducted by Nakajima et al.(2011). We selected root mean square wave height Hrms as wave height in our analysis for wave energy evaluation. By using a parameter Hrms/d, d is mean water depth, we estimate the parameter for the reborn wave height on the reef as 0.28±0.1. We investigate wave energy decay process using the parameter. We also study wave characteristics after wave breaking under the condition of flow existance.