Abstract
The drifting seaweed reaching ashore or inflowing to the harbor often cause a devastation of scenery and an offensive odor to which a countermeasure has been desired. A technology to capture such drifting seaweed has been developed and nearly in a practical use but a problem here is that the captured seaweed need to be collected and disposed by spending cost and time. In this study, a seabed-based structure which has a function to effectively exhaust drifting seaweed, such as the kelp which has settling velocity, out of the area concern was developed and its effectiveness was verified by the hydraulic experiment.