- 公益社団法人 土木学会
- 土木学会論文集B1(水工学) (ISSN:2185467X)
- vol.70, no.4, pp.I_1489-I_1494, 2014 (Released:2015-05-18)
In Japan, safety degree against flood is said to have increased by river improvement. However, frequently flooded areas still exist. This means that frequently flooded areas has some characteristics which prevent river improvement. Therefore it is important to clarify the distribution and characteristics of frequently flooded areas for thinking about future river improvement plans.In this research, we clarified the distribution of frequently flooded areas in Japan, using flooded area maps. As a result, it is clarified that most frequently flooded areas exist in narrow valley plains, and the reason why such areas are still flooded is difficulty of embankment.