In order to maintain atolls that are in danger of submerging due to rising sea levels caused by global warming, it is essential to conduct ecological surveys of coral reefs. The establishment of reconstruction technology based on these surveys is also urgently necessary for Japan to preserve its territories.

In 1950s, Stommel proposed an idea of "perpetual salt fountain".By making use of this idea, we have succeeded in an experiment of upwelling the nutrient-rich deep sea water. We have proposed a large, artificial upwelling facility in the sea areas such as Okinotorishima Island, and "the Laputa project", which cultivates the sea areas called "ocean desert" with low productivity, into the rich ocean forest.

I will introduce the progress and achievements of the world's largest analogue simulator, the "large hydraulic model of the Seto Inland Sea," which has been contributing to the environmental conservation of the Seto Inland Sea over the past 30 years and that I earnestly hope will be greatly used to develop environmental restoration technologies for nature regeneration in the Seto Inland Sea in the future.