Relationship between on-offshore sediment transport rate on the beach face and wave energy

Two different methods were employed to determine the on-offshore sediment transport rate on the beach face in the field. One method was based on topographic surveys where the ground level was repeatedly measured at on-offshore fixed points on the beach face. The other method involved direct measurements through a streamer-type sand trap. The on-offshore sediment transport rates obtained by using these two methods agreed well with each other. Based on results from the observations in this study and previous observations conducted by the authors (Kubota, et al.; 1997), the relationship between the on-offshore sediment transport rate on the beach face and the external forces that produced the transport was investigated. The on-offshore sediment transport rate on the beach face was shown to be closely related to a parameter involving the deviation of the beach face slope from its equilibrium value and the swash oscillation height and period.