JPS60109404A - Production of fresh water region in turbid water - Google Patents

Abstract

PURPOSE:To smoothly perform operations in water by a method in which lower- temperature fresh water than turbid water is supplied to the turbid water portion to produce a fresh water region in the turbid water and the range of vision in the turbid water section is made better. CONSTITUTION:Turbid water is taken out of the intake port 41 of a water suction tube 4 lowered to an operation range A, and the temperature of the turbid water is measured. Turbid water coming through the water suction tube 4 is put into a turbid water clarifier 1 for clarification, and the clarified turbid water is put into a cooler 2 to cool it to temperatures lower than the turbid water to obtain a fresh water having a higher density than the turbid water. The fresh water so cooled is discharged at a low flow rate from the outlet 31 of a low- temperature water supply tube 3 upward the operation range A. Since the operation range A has flowing fresh water, not turbid water, the range of vision in the turbid water region becomes better, and operations can be performed easily, exactly and safely. Also, since any chemical method is not used, there is no fear of pollution caused by chemicals for example.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for generating fresh water zones in turbid water.

When carrying out underwater civil engineering work on the seabed or the bottom of a lake, the inflow of turbid river water or the lifting up of bottom mud by sandstorms may cause the seawater or lake water to become muddy, resulting in poor visibility and the work being impossible.

The present invention was made to deal with such a situation.If water has a density difference and is near stationary, it is difficult for them to mix.

Also, water with a high density tends to accumulate under water with a low density. By applying the characteristics of water such as ``clear water'', a clear water area is created in the turbid water of the turbid seabed or lake bed, improving visibility and making it possible to perform underwater work smoothly. The purpose is to provide a method for generating

That is, the present invention relates to a method of generating a fresh water area in turbid water by supplying fresh water at a lower temperature than the turbid water to the turbid water area.

Next, embodiments of the present invention will be described with reference to the drawings, but before that, an apparatus used in the present invention will be described.

An embodiment of the method of generating a fresh water area in turbid water according to the present invention is as shown in FIG.
, a low-temperature water supply pipe 3, and a water intake pipe 4 are connected and installed on a workbench 5 of a work boat, etc., but as shown in other embodiments, fresh water at a lower temperature than turbid water can be supplied, and clean water can be supplied. If sufficient water can be taken in, it may be possible to omit some of the equipment.

(B) Turbid water purifier and cooler 3. The turbid water purifier 1 and cooler 2 use known devices. (B) Low temperature water supply pipe Low temperature water supply pipe 3 is connected to the cooler 2 and lowered into water. It's a J pipe.

Then, the low-temperature water supply pipe 3 is lowered to near f=J, such as the seabed or lake bottom, upstream of the underwater work range Δ, and its tip is used as the outlet 31.

Then, the outlet 31 is directed toward the work area A.

Furthermore, a plurality of low-drought supply pipes 3 may be used in parallel.

(c) Water suction pipe The water suction pipe 4 is a pipe connected to the turbid water purifier 1 to take water from underwater.

Then, take water from the tip of the pipe that has been lowered to the working range △ in the water]]41.

In addition, water intake D 41 (nearly there is a 1 that measures the temperature of turbid water)
)--The end portion 61 of a measuring device 6 placed on the workbench 5, such as a mister thermometer, is installed.

In addition, a pump mechanism for taking in water from the water intake port 41 is connected to the water intake pipe 4, and a pump a4M (both not shown) for discharging water from the outflow 1] 31 is connected to the low temperature water supply pipe 3. .

Next, use the above device to create a clear water area in the turbid water.11-
I will explain the method that will be used.

(B) Lower the water to the water intake work range Δ and take the turbid water from water intake 0/41 of the water intake pipe 4.

At this time, the end portion 61 of the measuring device 6 installed at the water intake r', I/I 1 measures the temperature of the turbid water near the working area A where the water is taken.

(b) Purification and cooling of turbid water The turbid water that has passed through the water suction pipe 4 is put into the turbid water purifier 1 and purified into clear water.

The purified fresh water is put into the cooler 2 and measured by the measuring device 6.Working area A Make it.

(c) Water discharge 3 - Cooled fresh water is discharged at a low flow rate above the work area A from the outflow 1] 31 of the low temperature water supply pipe 3.

At this time, the discharge is at a low flow rate C, and the density is increased by cooling, so there is a density difference between it and the surrounding turbid water (1) It is difficult to mix with the surrounding turbid water.

Also, the clean and transparent water discharged in the 1° direction of the working range Δ is fq
Because it is denser than the nearby turbid water, the turbid water in work area A, which has a lower density, replaces the turbid water, and the work area △ becomes clean, transparent water.

(D) Other Examples 1 The place where water is taken does not necessarily have to be near the work area, for example, if the water near the water surface f is clean, the turbid water purifier can be used by drawing water there for h days. It is conceivable that the installation of this would be unnecessary.

(Small) Other Example 2 If it is possible to take in water at a flow lower than the water temperature in the work area, for example, it is possible to take water from a part deeper than the bottom of the work area. becomes.

Since the present invention is as described in ①, the following 4- We can expect some positive effects.

(b) Since the device of the present invention can generate a clear water area in the work area, the work area has clear water instead of turbid water, so visibility is good and work can be performed easily, reliably, and safely.

(b) With this device, [Waters with different densities are difficult to mix if they are close to each other, and water with a high density of 10 accumulates under water with a low density. Since no chemical methods are used, there is no need to worry about pollution caused by drugs, etc.

(c) The speed of the cooling water discharged is extremely low, so it does not cause any trouble to the work.

[Brief explanation of drawings]

1st N: Explanatory diagram 2nd of how to use the device related to the present invention d
Figure 2 Layout of equipment related to the present invention 1: Turbid water purifier 2: Cooler 3: Low temperature water supply pipe 4: Water intake pipe 5: Work table 6: Measuring device 31: Outlet 41: Water intake 61: Terminal △ :Scope of work Applicant: Taisei Corporation Ne1

Claims (1)

[Claims] A method of creating a clear water area in turbid water by supplying fresh water at a lower temperature than the turbid water to the turbid water area.