JPH0424935Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bank that artificially forms an upwelling flow on the ocean floor, river bed, lake bed, etc. [Prior Art] Conventionally, as shown in Fig. 3, there has been a method on natural seabeds, riverbeds, and lakebeds that causes tides or water currents to rise upward from these seabeds, riverbeds, and lakebeds. In other words, there are natural rock reefs 11 and slopes 12 that cause upwelling currents, and these upwelling currents (arrows) cause dead fish that pile up on these seabeds, riverbeds, and lakebeds, and that breed in rock shadows and slopes. It is said that the microorganisms in the air are blown upwards, and fish find them and use them as food.

On the other hand, in response to the global overfishing of fish and shellfish and the protection of marine resources, artificial fish and shellfish farming has become popular, and various fish reefs, spawning reefs, etc. (hereinafter referred to as artificial reefs) have become popular. ) has been established.

However, the sea where these artificial reefs are set up,
Not all rivers, lakes, and other areas had topography or rocky reefs that would create good natural upwelling. Therefore, it is important to provide an artificial upwelling bank that can form an upwelling flow comparable to these natural upwelling flows.
It can be said that the contribution made to the development of the above-mentioned artificial fish and shellfish farming technology is extremely large.

[Problem that the invention attempts to solve]

The purpose of the present invention is to provide an artificial upwelling bank that can form an upwelling flow comparable to a natural upwelling flow, thereby contributing to the development of fish and shellfish aquaculture technology.

[Means for solving problems]

The object of the present invention can be achieved by an artificial upwelling bank formed by mooring a buoyant plate or sheet at one point.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a perspective view showing one embodiment of the artificial upwelling embankment of the present invention.
It is moored with a mooring rope 4 to an anchor 3 on the bottom or the lake bottom (hereinafter referred to as the seabed), but as shown in the figure, in the present invention, it is moored at one point, that is, it is substantially moored at one point. It is moored with a real mooring rope 4, and is characterized in that the sheet-like material 1 is moored rotatably against changes in the flow direction of water. This mooring rope 4 can be engaged with one anchor 3 for mooring, for example.
That is, in order to form an effective upwelling flow on the seabed, the above-mentioned buoyant plate or sheet material 1
It is necessary to always orient the surface substantially perpendicularly to the flow direction S of the tidal current (water flow), and for this purpose, it is a requirement that the plate or sheet-like object 1 be moored at one point.

That is, in a plan view viewed from above with respect to the flow direction S, the surface of the plate or sheet-like object 1 faces in a direction that blocks the flow, that is, substantially perpendicular to the flow direction S. When viewed from the side, the surface of the plate or sheet 1 is inclined in the direction of the resultant force of the buoyant force and the force of the flow.

The plate or sheet materials that make up the upwelling bank of the present invention include water-resistant and corrosion-resistant plastic plates, plates made of composite materials such as fiber-reinforced plastic, and corrosion-resistant aluminum and stainless steel. metal plates, laminates of these plates and foam sheets, etc., sheet-like materials such as fabrics, plastic sheets, or films fixed to the frame, and at least two of the above-mentioned plate-like materials and sheet-like materials. Examples include composites or laminates in which species are combined.

These plate-like objects and sheet-like objects need to have buoyancy, but they may be integrally molded with the foam sheet or various floating objects to provide buoyancy to themselves, or they may be provided with buoyancy by attaching a floating object. It is also possible to have a configuration that gives . In addition, we constructed several artificial upwelling banks according to the present invention, with the heights being lower towards the front and higher toward the back of the tidal flow, as shown in Figure 4. By arranging it in a mold, the height of the upwelling flow can be increased.

Furthermore, the artificial upwelling embankment of the present invention exhibits appropriate shading effects, eddy current effects, etc., and functions as a fish reef.

In order to prevent the adhesion of seaweeds and shellfish to the above-mentioned plate-shaped bodies, sheet-shaped bodies, floating bodies, etc. of the present invention, resins containing various chemicals can be coated or kneaded into them during molding.

FIGS. 2A, 2B, and 2C are perspective views showing one embodiment of the plate-like object and the sheet-like object, respectively.
Figure 2A shows a hollow spherical floating body 6 attached to a plastic plate 5, Figure 2B shows a fabric 8 attached between the floating body 6 and a frame rod 7, and Figure 2C shows a Wings 9 and 10 are installed on both sides of the plate-like body 1 in Figure 2A.
It has been established. As shown in FIG. 2C, when the plates and sheets of the present invention are provided with wings, the stability of the plates and sheets against tidal currents and water currents is improved, and upwelling flow is improved. It gets expensive.
Furthermore, durability is also improved. However, if the longitudinal center of the blades provided on both sides of the plate and sheet is not fixed to both sides of the plate and sheet, the stability in all directions of flow and the air flow will be affected. Does not contribute to improvement in current flow and durability.

Note that the anchor and mooring rope are not particularly limited as long as they are known.

[Effect of idea]

According to the present invention, it is possible to form a stable artificial upwelling flow that is no different from a natural upwelling flow at any location (such as the ocean floor or the bottom of a lake). Even if the direction of flow changes, this effect remains the same. Moreover, the artificial upwelling embankment of this invention has excellent mechanical strength, and the parts that make up it, such as plates and sheets, are made of materials that chemically prevent and suppress the adhesion of seaweed and shellfish. The durability of the upwelling bank can be improved by
A stable upwelling effect can be maintained for a long period of time. Furthermore, it can be easily installed by simply throwing it in, has excellent workability, and does not require any expense.

[Brief explanation of drawings]

Figures 1 and 4 are respectively a perspective view and a sectional view showing an embodiment of the artificial upwelling embankment according to the present invention, and Figures 2A, 2B, and 2C are respectively the plate-like plates used in the present invention and FIG. 3 is a perspective view showing one aspect of the sheet-like material, and is a schematic diagram illustrating the state of upwelling flow due to a natural rocky reef. 1... Plate or sheet-like object, 2... Buoyant body, 3... Anchor, 4... Mooring rope, 5...
Plastic board, 6... Floating body, 7... Frame bar, 8...
...Fabric, 9,10...Wings.

Claims (1)

[Scope of utility model registration request] An artificial upwelling bank made by mooring a buoyant plate or sheet at one point.