Author(s): Seren Nishijima; Makoto Nakatsugawa

Linked Author(s): Makoto Nakatsugawa, Seren Nishijima

Keywords: Emergency spillway gate operation; Surcharge water level; Snowy cold region; D4PDF; Dam linkage

Abstract: The objective of this study is to proposeflood risk reduction measures involving dam linkages, with consideration of the flood characteristics of snowy cold regions due to climate change. In the case of multi-purpose dams in snowy cold regions, disaster prevention operations may be carried out during abnormal floods due not only to heavy rainfall in summer but also to snowmelt and rainfall in early spring. In this study, the frequency ofdisaster prevention operations during abnormal floods caused by rainfall and snowmelt in the present and future climates was estimated for two dams in the upper reaches of the Toyohira River in Hokkaido, using d4PDF ensemble data of rainfall and temperature. In addition, we examined whetherflood control safety can be improved by transferring the flood control capacities of the two dams, taking into account theirfunctions and hydrological characteristics. As a result, it was shown that dam linkage is effective as an adaptation measure against climate change.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0318-cd

Year: 2023