Hydraulic and earth engineering – Bank – shore – or bed protection – Wave or flow dissipation
Patent
1998-01-16
2000-08-22
Taylor, Dennis L.
Hydraulic and earth engineering
Bank, shore, or bed protection
Wave or flow dissipation
405 15, 405 21, E02B 306
Patent
active
061061956
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for the formation of a tidal residual current in a water area and, more particularly, to a method for the formation of a new tidal residual current by controlling tidal oscillation flow in a water area or the like of a bay, port or the like or around an island.
BACKGROUND TECHNOLOGY
Heretofore, in a water area or the like of a bay, port or the like or around an island, a closed sea area is formed where new sea water no longer or little has been exchanged for old sea water. When contaminated or polluted water flows in such a closed water area from river or drainage or the like, such water remains still in the closed water area, thereby worsening a water quality in the closed sea area as time lapses.
There have been developed various methods for cleaning contaminated or polluted water, for example, as disclosed in Japanese Patent Unexamined Publication No. 6-146,249.
The method for cleaning the water quality of such contaminated or polluted water involves forming a flow path in the closed sea area by mounting both side walls with a plurality of artificial roughness formed at intervals extending in a flow direction and allowing the artificial roughness to create a tidal current flowin one direction within the closed sea area, thereby causing the polluted water flown in the closed sea area to outflow outside the closed sea area and cleaning the water within the closed sea area.
The above-mentioned water quality cleaning method still suffers from the defects as follows: roughness formed on the side walls thereof can create no tidal oscillation flow. extending in the flow path of the closed sea area, however, the flow direction cannot be controlled freely in an optional direction. path of the closed sea area is a two-dimensional change, not a three-dimensional change that can, for example, prevent the formation of a stratifying phenomenon in which a light surface layer having higher temperature and a heavy deep layer having lower temperature (a layer in a non-oxygen state or a poor-oxygen state) are formed, or destroying the layer.
DISCLOSURE OF INVENTION
The present invention relates to a method for the formation of a tidal residual current in a water area, characterized in that a plurality of bottom structure members for controlling the tidal oscillation flow are disposed on the bottom of the closed sea area to create a tidal residual current.
The present invention further relates to a method for the formation of a tidal residual current in a water area, characterized in that the bottom structure member is provided with an appropriate extent of roughness; a bottom structure member has a difference in directional roughness caused to arise between roughness on a forward direction side with respect to a tidal oscillation flow in a forward direction and roughness on a rearward direction side with respect to a tidal oscillation flow in a rearward direction; a bottom structure member has a surface arranged so as to provide the tidal oscillation flow with a momentum in a predetermined direction to allow the surface to act as a momentum-adding surface; the bottom structure members each having the difference in directional roughness are disposed on a bottom of the water area in the flow direction of the tidal oscillation flow and the bottom structure members each having the momentum-adding surface are disposed on the bottom thereof in a direction intersecting with the flow direction of the tidal oscillation flow, thereby creating a new tidal residual current having a curved flow pattern; and the bottom structure members are provided with the function of gathering fish and the function of providing fish with nests.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view for describing the concept of a method for the formation of a tidal residual current in accordance with the present invention.
FIG. 2 is a perspective view showing a bottom structure member for use in the formation of a tidal residual current in accordance with the present invention.
FIG. 3 i
REFERENCES:
patent: 4560304 (1985-12-01), Jenkins et al.
patent: 4661013 (1987-04-01), Jenkins
patent: 4998844 (1991-03-01), Mouton et al.
patent: 5215406 (1993-06-01), Hudson
patent: 5246307 (1993-09-01), Rauch
patent: 5478167 (1995-12-01), Oppenheimer et al.
Komatsu Toshimitsu
Yano Shinichiro
Taylor Dennis L.
Toeishokou Kabushiki Kaisha
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