Abstract
A suspended sediment sampler was desiged for the flood observation. From the requirement on the feasibility of measurement at many time-space points in one flood, we have produced a light weight sampler with a manometer which memorizes information of the measurement depth. This was tested for the flood of September 1994 in the Abukuma river with peak discharge of 3, 000m3/s. The grain size distribution of sediment and concentration were analysed and show significant change during the flood. The concentration near the bottom is also estimated.
