地形・地質に基づく中山間地の集落・河川の類型化と人口減少社会下における河川維持管理の課題

抄録

In the society of population decline, the activities of the local residents are considered to be decreasing. When activities related to river management decrease or disappear, some rivers will change their conditions. It will be essential to consider what local government should do despite the financial difficulty. In this research, the condition of mountainous rivers and villages around Kanto region is investigated and classified into six groups based on the geomorphological conditions. The difference of the river channel shape and sediment transport, which are affected by geomorphology, affects the characteristics of disaster and water use type that decide location of villages and the way of river utilization. By interviewing to river managers, it was clarified that the biggest problem of mountainous rivers is thick growth of vegetation. The problem is remarkable in some specific geomorphological condition, but the response of local people is different because of the difference of accessibility to the river.