Development of Profiler System for Suspended Sediment Concentration

摘要

There have been several methods to measure sediment transport rate as suspended load, as well as bed load (e.g., Horikawa, 1988; Seymour, 1989). As for the former mode of sediment movement, the methods proposed up to now can be classified into two groups: (1) light transmission meters and (2) sand samplers. Both type of the measuring system has provided a number of observed data that has been utilized for understanding mechanism of sediment movement and resulting beach topography change. However, all of these existing systems are not suitable for simultaneous data acquisition in vertical direction with sufficiently high spatial resolution, because of the size of a sensor. In the present study, a profiler system is developed for measuring system, which enables us to determine spatial and temporal variation of sediment concentration under waves and/or unidirectional flow.