Preprints
https://doi.org/10.5194/egusphere-2023-2866
https://doi.org/10.5194/egusphere-2023-2866
18 Dec 2023
 | 18 Dec 2023

Levee system transformation in coevolution between human and water systems along the Kiso River, Japan

Shinichiro Nakamura, Fuko Nakai, Yuichiro Ito, Ginga Okada, and Taikan Oki

Abstract. Floodplain societies decide whether to protect themselves against floods (fight), live with floods (adapt), or a combination of the two. The formation of a levee system is an important factor in determining whether a society fight or adapt to flood; however, these factors have been considered as fixed boundaries in previous studies in human-flood interaction. We analyse a levee system transformation process covering the past century, from the indigenous ring-type levee system with floods to modern continuous levees against floods in the Kiso River basin, Japan, by applying a historical sociohydrological approach. The results show degradation processes of the indigenous levee system and traditional communities alongside the installation of modern continuous levees, and a trade-off relationship was observed between the lengths of both. There are interactions between the levee systems and the human-water system through various water uses and different scale components, and the dynamics within the region are connected to external socioeconomic trends through the installed modern levees and institutions.

Shinichiro Nakamura, Fuko Nakai, Yuichiro Ito, Ginga Okada, and Taikan Oki

Status: final response (author comments only)

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  • RC1: 'Comment on egusphere-2023-2866', Anonymous Referee #1, 16 Feb 2024
  • RC2: 'Comment on egusphere-2023-2866', Anonymous Referee #2, 23 Feb 2024
Shinichiro Nakamura, Fuko Nakai, Yuichiro Ito, Ginga Okada, and Taikan Oki
Shinichiro Nakamura, Fuko Nakai, Yuichiro Ito, Ginga Okada, and Taikan Oki

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Short summary
The formation of levee systems is an important factor in determining whether a society fight or adapt to flood. This study presents the levee system transformation process over the past century, from the indigenous levee system to modern continuous levees, and its impacts on human-flood coevolution in the Kiso River basin, Japan, and reveal the interactions between levee systems and human-flood systems involving different scales and water phenomena.