遡上域の漂砂濃度測定手法の検討

抄録

To measure the suspended sediment concentration in the swash zone of real beach, a concentration meter using the infrared backscatter method, a CCD camera, and an electro-magnetic current meter were employed. Clear peaks were appeared in the time series of the suspended sediment concentration. Averaged values of these peaks were similar to the values from sediment transport rates measured simultaneously by sand traps. It was assumed that the occurrence of the concentration peak was depended on the offshore current velocity on the eve of it rather than the current velocity at the sametime. From cross spectrum analysis, suspended sediment concentration was correlated well with the on-offshore standing wave.