Session3: Environmental Hydraulics
Title: QUANTITATIVE EVALUATION OF WATER TEMPERATURE CHANGE ON COLD WATER FISH HABITAT IN SNOWY COLD RIVER
Keisuke Kudo, Makoto Nakatsugawa
The water environment has been strongly affected by climate change in snowy cold regions. The effects of climate change are inevitable, even if mitigation plans for greenhouse gas reduction are implemented. It is necessary to evaluate quantitatively the effects of climate change on water environment to formulate adaptation plans in snowy cold regions. Therefore, we quantitatively evaluated the future change of water temperature and the impact on cold water fish habitat in snowy cold river by adopting estimated highresolution data, which can predict meteorological characteristics with climate change in snowy cold regions by using MRI-NHRCM20, which is climate change data based on RCP emission scenario adopted by the IPCC’s Fifth Assessment Report. Sorachi River, which is snowy cold river in Hokkaido, has suitable habitat for salmonid fish, such as Hucho perryi. Hucho perryi is designated as an endangered fish and the impact of raising water temperature with climate change is concerned. For the river water temperature simulation with climate change, the analysis model was constructed that based on heat and water balance model (LoHAS), tank model and channel tracking of heat flux.