Sea grass algae, which are a source of CO₂ absorption, are attracting attention for their effective-ness in reducing global warming as "blue carbon". However, the Seto Inland Sea has long experienced a decline in its algal beds due to a variety of factors, and its biological resources have also been on the decline. In recent years, technological development for the creation of seaweed beds has been actively carried out in many parts of Japan, and the creation of artificial seaweed beds is desired.

 This study confirmed the superiority of artificial reefs with a flow control function over existing technologies by quantitatively evaluating them through hydraulic experiments and evaluating their functions after they have been sunk. The objective was to develop a new seaweed bed creation technology by verifying the effect of artificial reefs on the population of organisms, carbon fixation and CO₂ reduction.