| 摘要 |
PROBLEM TO BE SOLVED: To provide a water quality improvement method in which a water quality can be improved by low cost without blemishing a waterside landscape.SOLUTION: A vegetation floating island 12 is moored in a closing property water area 11 such as a lake, a circumference thereof is attached with two or more light-shielding materials 13. These light-shielding materials 13 are formed to a sheet shape of a foam material (component) or the like of polystyrene, EVA, urethane or the like that floats on water and has a light-shielding function, and a piece part of both sides thereof is attached to a skeleton attached to a frame 15 of the vegetation floating island 12. These light-shielding materials 13 are disposed at a prescribed depth in water, and block sunlight in the water. Herewith, a light-shielding area is enlarged without enlarging an area that is exposed to a water level, and a growth depression effect of a phytoplankton is raised without blemishing a waterside landscape. |
