| 摘要 |
PROBLEM TO BE SOLVED: To provide a shading method by arranging a shading body so as to float the same on the surface of the water of lakes and marshes in such a way to move the same artificially or forcibly without relying on a natural factor such as wind or a natural water stream and returning the shading body moved by the natural factor such as the wind or the natural water stream or locating the same on the surface of the water at a desired position. SOLUTION: The shading body 5, which is arranged so as to be floated on the surface Wf of water of the lakes and marshes 1, is moved freely on the surface Wf of water by a dynamical means. COPYRIGHT: (C)2004,JPO
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