Author(s): Kazuaki Ohtsuki; Jun Nishihiro; Hiroki Kato; Keigo Nakamura
Linked Author(s): Kazuaki OHTSUKI
Keywords: No keywords
Abstract: Wetlands are not only the most ecologically important habitat, but also a typical green infrastructure with multi-purpose functions such as flood mitigation and water purification. However, the channelization of watersheds for agricultural development has accelerated flood runoff and increased the vulnerability of watersheds due to the urbanization of low-lying areas that has occurred at the same time. In recent years, however, agricultural lands have been seriously abandoned, and waterways remain as a negative legacy. In this study, the potential of abandoned farmland for flood mitigation was examined by clarifying channel development and flood runoff acceleration in a rural watershed in the suburbs of Tokyo. The results showed that the peak flood discharge in 1975 was more than 10% lower than that in the current channel condition, and the estimated damage in a medium to large flood could be about 3% lower than that in the current condition.
Year: 2022