荒川流域における自然堤防の治水機能

抄録

Natural levees are a kind of micro-topographies made by large flood inundations. The extension of inundation waters by flooding is affected by arrangement and scale of natural levees. The objective of this study is to clarify the functions of natural levees on the Ara river alluvial fan and middle reach of the Ara River for the flooding by using topographical classification maps and results of analysis of inundation of 100-year flood. We clarified that natural levees had functions of the base of community developments, and reduction of flood damages. There are possibilities to give flexible flood control measures to flooding areas by natural levees coping effectively with other infrastructure facilities such as roads and railways.