According to the IPCC report, "Global warming is causing the temperature to rise to 1.5 degrees Celsius in a short period of time, and the increase in disasters is inevitable, which may pose multiple risks to ecosystems and humans. He concluded that it is expensive, and emphasized the importance of measures = "adaptation" to respond to global warming in advance.


Under these circumstances, in Hokkaido, where typhoons hit one after another, measures are being taken based on the effects of global warming.

Hokkaido hit by typhoons one after another

In Hokkaido, as many as four typhoons landed and approached in August 2016.



Nine rivers, including the Tokoro River, which flows through Kitami City, suffered great damage such as the breach of the embankment.



A review committee of experts pointed out that "the effects of climate change have become a reality," and the Ministry of Land, Infrastructure, Transport and Tourism's Hokkaido Development Bureau and Michi considered measures that take into account the effects of global warming.



In 2090 at the end of this century, assuming heavy rainfall that occurs once every 100 years when the average temperature rises 4 degrees from before the Industrial Revolution, the range and depth of flooding will increase in the basin of the Tokoro River, such as Kitami City. The worst death toll was over 3,400, which is estimated to be more than 12 times the current level.

Flood measures in anticipation of global warming

For this reason, in the river improvement plan that was finalized in December last year, we decided to increase the amount of flowing water by taking measures such as deepening the bottom of the river, and the length is about 48 km, which is more than double the conventional plan. It was made.



Furthermore, in case of flooding, the earth and sand generated during the construction will be used as an embankment to raise the land, and after relocating public facilities, it will also be used as an evacuation site.



Professor Makoto Nakatsugawa of Muroran Institute of Technology, who chaired the Study Group on Hydraulic Control Measures in Hokkaido, said, "As the population declines and the population ages, it will be difficult to improve the infrastructure even if a disaster occurs. It is also necessary to narrow down the wisdom, not the wisdom. "

Promote future forecast utilization countries

The national council also says that hydraulic planning should utilize rainfall forecasts that take climate change into account.



On top of that, the national government is calling for initiatives that are not limited to hard measures, such as ▽ land use regulations and ▽ support for evacuation drills.