JPS60148908A - Promotion of seawater exchange flow - Google Patents

Abstract

PURPOSE:To promote the exchange flow of seawater by installing control plates directing waste water in coordinating with the drifting direction of seawater due to ebb and flow of the tide on the side of a draining outlet of a power plant installed near the closed sea area having the outlet inside a bay and a seawater inlet in the open sea. CONSTITUTION:At the ebb tide, when seawater flows from the closed sea area 1 side to the open sea, control plates 6 are turned toward the mouth of a bay as the solid line indicates. When used seawater directed through a drainage canal 5 is discharged from a draining outlet 4, the plates 6 accelerate the flow of seawater toward the mouth of the bay. And at the flow tide, when seawater flows from the open sea to inside the bay, the plates 6 are turned to inside the bay by operating a cylinder 8, so the waste water promotes the exchange flow of seawater toward inside the bay.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for promoting exchange of seawater, and more specifically, the present invention relates to a method for promoting exchange of seawater, and more specifically, the present invention relates to a method for promoting exchange of seawater, and more specifically, for closing off bays, etc. where eutrophication is progressing by utilizing the drainage flow of large amounts of cooling water used by power plants, etc. It relates to a method of promoting seawater exchange within a body of water.

Fisheries are actively carried out in closed waters such as bays. Although these closed waters have calm sea conditions and are easy to use, problems arise in that seawater exchange is poor and eutrophication is progressing, reducing productivity.

On the other hand, various methods of seawater exchange in such closed water areas have been studied in the past, such as bay entrance improvement, new waterway excavation ridge or diversion levee, III shore levee, etc., as well as forced seawater exchange using power. Pumps are used to promote exchange;
In some cases, methods such as aeration were used.

However, it was said that those using power were wasteful because their energy was too small compared to natural energy.

The present invention was developed in view of the above circumstances, and utilizes facilities that constantly move large amounts of fresh seawater, such as thermal power plants and nuclear power plants, to promote seawater exchange in closed water areas and to improve natural tidal currents. The purpose of the present invention is to provide a method for promoting seawater exchange that can promote seawater exchange using waves and the like.

Hereinafter, details of the method of the present invention will be explained with reference to the drawings.

Fig. 1 explains the outline of the method of the present invention. In the figure, the part indicated by reference numeral 1 is a closed water area, and a power plant 2 using thermal power or nuclear power is constructed at a high place near this closed water area. .

This power plant 2 has a water intake 3 that takes in seawater from the open sea using a pump or the like, and a drain 4 is provided in the closed water area 1 via a discharge channel 5.

In general, the only driving force for movement of water in the closed water area 1 is seawater exchange due to natural tides, so eutrophication progresses within the closed water area.

Therefore, in the present invention, in order to promote seawater exchange in connection with the bay flow due to natural ebb and flow, a flow direction control plate 6. was installed at the drain port 40.

These control boards6. are each rotatably attached to the drain port 4 side by a pin 7 at its base end.

In addition, these control boards 6. The cylinder 8 is placed near the
The tip and middle of the rond are rotatably connected to the control plate 6.

By adopting such a structure, for example, when seawater flows from the closed water area 1 side to the open sea at low tide, the control plate 6. The used seawater that has been led to the bay mouth side via the discharge channel 5 is discharged from the drain port 4, which serves to promote the flow of seawater toward the bay mouth side as shown by the arrow of the actual head. fulfill.

The energy of natural seawater exchange is enormous, and a power plant with a capacity of about 1 million αV can generate about 6 million tons/day, which is insignificant in the sense of wastewater seawater exchange, but it is important to promote exchange. In that sense, it is valid.

On the other hand, at high tide, seawater flows from the open sea toward the bay, but in this case, the cylinder 8 is activated and the control board 6
．． If it is directed toward the bay as shown by the chain line in Figure 2, the wastewater will flow toward the bay and encourage seawater exchange.

In this way, it is possible to promote seawater exchange within the closed area according to the ebb and flow of the tide, prevent eutrophication of the fishing grounds in the bay, purify the seawater in the bay, and encourage local fishermen and tourists to use the bay. This will bring great benefits to related businesses and tourists, and will facilitate fisheries compensation.

FIG. 3 is for explaining another embodiment of the present invention. In this embodiment, the tip of the drain port 4 is connected to the drain port 4a facing toward the inside of the bay.
and a drain port 4b facing the bay entrance, one end of which is rotatably attached to the center of both, and this is rotated by a cylinder 8 toward the bay entrance and the inside of the bay to control the drainage flow. It is constructed so that the direction can be changed.

Even if such a structure is adopted, it is possible to promote seawater exchange by changing the direction of the drainage flow according to the ebb and flow of the tide, as described above.

On the other hand, FIG. 4 explains still another embodiment of the present invention. In this embodiment, the center of the control plate 6 is rotatable via a pin 9 near the tip of the drain port 4. It is mounted on a shaft in the vicinity of the drain port 4 using a support member 10, and is configured so that it can be rotated by a power source (not shown) between the bay entrance side shown by a solid line and the bay side.

Even if such a structure is adopted, it is possible to promote the exchange of seawater in the bay due to the ebb and flow of the tide, as in the above-described embodiment.

In the above-described embodiment, one drainage port 17 may be provided, but by providing a plurality of drainage channels 5 and linking them to the tide, the drainage channels can be used to promote seawater exchange.

As is clear from the above explanation, according to the present invention, a drainage port for discharging used seawater from power plants, etc. is provided at an appropriate position within a closed water area, and the drainage flow from this drainage port is adjusted to match the ebb and flow of the tide. By changing the direction of seawater, it promotes seawater exchange, dramatically improves the water exchange rate within the closed water area, prevents eutrophication of fishing grounds within the closed water area, and provides a great benefit to surrounding fishermen and tourists who use the bay. can bring benefits.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of equipment in a closed water area, and Figures M2 to 4 are structural diagrams of a drainage port explaining different embodiments of the present invention. 1...Closed water area 2...Power plant 3...Water intake 4...Vl'water 1'' 5...Discharge channel 6...Control board 7, 9...Bin 8... Cylinder 10...Supporting member Applicant: Hazama Co., Ltd. Figure 1, page 2 L"i43

Claims (1)

[Claims] A power plant installed near a closed body of water with a water intake in the open sea and a drainage outlet in the bay has a control plate that can be freely rotated to guide the drainage according to the flow direction of seawater caused by the tides on the drainage outlet side. A method for promoting seawater exchange, characterized in that the seawater exchange is promoted by the drainage flow.