三峰川流域における土砂の生産と流出に関する観測

抄録

In this paper, the results obtained at present in the cooperative research projects between JSCE and the Ministry of Land Infrastructure and Transport on the "Observation and Evaluation of the Sediment Yield and Its Amount" are shown. Firstly, development of a new suspended-sediment concentration measuring system with a differential pressure transmitter is introduced and the results of the field experiments at the Miwa reservoir, situated on the lower reach of the Mibu River, are shown. Secondly, classification of the sediment yield and the characteristics of the sediment diameter in the Todai basin, that is one of the sub-basins where the sediment yield is very severe in the Mibu River basin, are presented originated in the field investigation. Finally, by investigating the vertical distribution of sediment diameter in the sabo dam in the Todai basin, the sediment was found to be armored remarkably in the vertical direction about twice as deep as the maximum sediment diameter on the riverbed surface.