流砂水文観測に基づく山地河川の流砂特性の把握

摘要

It has been difficult to quantify and predict sediment transport in mountain rivers though it is one of the critical factors in integrated sediment management. However, owing to the recent effort to accumulate data from hydrologic and sediment transport observation in mountain rivers, it has become possible to characterize sediment transport and its temporal changes for each sediment transport system of mountain rivers. This progress also suggests the possibility of quantitatively monitoring changes in the conditions of a sediment transport system.%山地河川の流砂量は総合土砂管理を考える上で1つの制約条件となると考えられるが、流砂量を把握・予測することは難しかった。一方、近年の山地河川における流砂水文観測データの蓄積により、山地河川の流砂特性に関する流砂系ごとの特性や時間変化が把握され、流砂系の状況の変化を定量的に監視できる可能性が確認できてきた。