最上川における漂流ごみ全体及び流木輸送量の把握と漂流ごみ対策技術の検討

抄録

Although marine debris is a main environmental issue in coasts, total floating-litter and driftwood transport through rivers are still unclear. In this study, we carried out an automatic and continuous monitoring system for floating-litter transport in Mogami River and evaluated total floating-litter transport and driftwoods transport. The results indicated that the total floating-litter and driftwood transport in flood conditions was at least several hundred times that in low-flow conditions. Driftwood transport was about 10 % of the total floating-litter transport. To collect the floating-litter in rivers, we conducted 3D flow simulation for measure performance of a new design in which several fences are set at outer bank in rivers.