JP4969356B2 - Submarine installations for improving the seabed environment and methods for improving the seabed environment - Google Patents

Description

  The present invention relates to a seabed laying structure for improving the seabed environment and a method for improving the seabed environment.

  In this specification, all kinds of waves and all kinds of flows are referred to as water streams.

  In closed sea areas such as bays and bays, the organic matter that flows into the water area and the organic matter that has been regenerated here sinks to the bottom of the sea and deposits on the bottom of the sea, creating sludge rich in organic matter, which dissolves dissolved oxygen in the bottom water. Consume and form an anoxic water mass. This anoxic water mass springs up and a blue tide is generated. When the blue tide occurs, it becomes difficult for fish and other organisms to live.

Therefore, in order to prevent the occurrence of the blue tide, as disclosed in Patent Document 1 below, one or two or more ascending pipes standing and fixed in water, and the inside of the ascending pipe are moved up and down. Using the energy of tides and waves, comprising a partition that divides into two, a flow hole provided in the partition, and a rise valve provided so as to close the flow hole, and the rise valve is opened only upward An open tide / wave type water circulation device has been proposed that can circulate and mix deep-sea low-oxygen water with surface water.
JP 2004-218273 A

  However, this open-type tide / wave type water circulation device has a long ascending pipe whose upper end can be positioned on the water surface and whose lower end is located in the deep sea, and the inner diameter of the pipe is about 2 m. In addition, many are required to achieve the intended purpose. Therefore, it is bulky to transport this device to the destination, and a great deal of effort is required to install it in the sea.

  An object of the present invention is to provide a submarine environment improvement method for improving the submarine environment that can be easily and reliably improved while providing a submarine environment improvement article that is not bulky to transport and that can be easily operated in the sea. It is to provide.

  The seabed environment improvement submarine laying structure according to the invention of claim 1 is arranged in a plurality of strip-shaped bases made of a flexible material and on the strip-shaped bases so as not to overlap one or more rows in the longitudinal direction thereof. At least the rear edge and the left and right edges of the whole are made of a flexible material and are made of a trapezoidal flow resistor in the unfolded state. The trapezoidal flow resistor is deformed so that the left and right oblique sides are parallel to each other. By fixing the portion and the left and right edge portions to the belt-like substrate, a forward open portion in the same direction is formed between the front edge portion of each water flow resistor and the belt-like substrate.

  The trapezoidal water flow resistor in the developed state may be entirely made of a flexible material, but the water flow resistor on which the flexibility of the band-shaped substrate made of a flexible material so as to be able to adapt to the unevenness of the seabed is provided. It is necessary that at least the rear edge and the left and right edges of the whole be made of a flexible material.

  The width of the belt-like substrate is preferably 0.1 m to 10 m in terms of transportation, and the length is preferably 1 m to 100 m in terms of processing work and hand work during carrying. Further, the size of the water flow resistor is preferably 2 cm to 100 cm, in which the length in the left-right direction is matched to the lateral width of the belt-like substrate, and the length in the front-rear direction is suitable for resistance to water flow.

Further, when the water flow resistor having the forward opening portion is subjected to water flow resistance, the inclination angle of the inclined surface on the center line is suitably 5 ° to 175 ° to change the water flow direction for seawater agitation. is there.

  According to a second aspect of the present invention, in the submarine laying structure for improving the submarine environment according to the first aspect, the flexible material of the belt-like substrate is a net-like woven fabric, a woven fabric, a non-woven fabric, a knitted fabric, rubber or a soft synthetic resin. The flexible material used for at least the rear edge portion and the left and right edge portions is a woven fabric, a non-woven fabric, a knitted fabric, rubber, or a soft synthetic resin.

  In the above, the raw material of the net-like woven fabric, woven fabric, non-woven fabric and knitted fabric is biodegradable fiber such as synthetic fiber, polylactic acid, polybutylene succinate adipate, polyvinyl alcohol, polycaprolactan and fatty acid polyester, palm, hemp And natural fibers such as cotton.

  The seabed environment improving method according to the invention of claim 3 is the seabed environment improving method according to claim 1 or 2, wherein the flexible material of the belt-like substrate is a mesh woven fabric through which sludge is passed. An anchor is attached to a required part around the belt-shaped substrate, and the open part of the total water flow resistor is laid on the seabed where the sludge rich in organic matter exists so as to face the water flow, and the sludge is covered with the belt-shaped substrate. Receiving resistance at the inner surface of each water flow resistor on the belt-like substrate, the organic matter that flows backward while stirring and rises from the open part and settles above the seabed laying material is stirred, and the organic matter accumulates on the seabed and becomes anoxic In addition to preventing the formation of water masses, the sludge that causes the formation of anoxic water masses on the seabed through the mesh of the net-like woven belt-like substrate is agitated and removed.

  In the above, the seabed sludge in which the sludge exists includes both the sludge accumulated on the seabed and the sludge floating above the seabed.

  According to a fourth aspect of the present invention, there is provided a seabed improvement method according to the first or second aspect, wherein the seabed laying structure for improving the seabed environment is attached to an anchor at a required location around the belt-shaped substrate, and the open portion of the total water flow resistor is opposed to the water flow. In this way, each water flow on the belt-like substrate is subjected to resistance on the inner surface of the water flow resistor, and rises from the open portion while being stirred. The organic matter that settles above the seabed laying material is agitated to prevent the organic matter from depositing on the seabed and forming an anoxic water mass.

  According to a fifth aspect of the present invention, there is provided a seabed improvement method according to the first or second aspect of the present invention, wherein the flexible material of the belt-shaped substrate does not allow the sludge to pass through the seabed laid material around the belt-shaped substrate. Attach an anchor at the required location and lay the open part of the total water flow resistor on the sea floor where anoxic water mass exists so as to face the water flow, and when laying, the sludge rich in organic matter on the sea floor tries to rise In addition, the water flow receives resistance at the inner surface of each water flow resistor on the belt-like substrate, and reversely flows while being stirred and rises from the open portion, stirs the organic matter that settles above the seabed laying material, This prevents water from depositing on the ocean floor and forming anoxic water masses.

  In the inventions according to claims 3 to 5, the number of the seabed laying objects for improving the seabed environment with respect to the seabed is arbitrary depending on the state of the seabed.

The seabed environment improvement submarine laying structure according to the invention of claim 1 is arranged in a plurality of strip-shaped bases made of a flexible material and on the strip-shaped bases so as not to overlap one or more rows in the longitudinal direction thereof. At least the rear edge and the left and right edges of the whole are made of a flexible material and are made of a trapezoidal flow resistor in the unfolded state. The trapezoidal flow resistor is deformed so that the left and right oblique sides are parallel to each other. by the parts and the right and left edge portions adhering to the band-shaped substrate, all because those forward opening in the same direction is formed between the front edge and annular base of the water flow resistance, the adjacent water flow It can be freely bent between resistors. Therefore, when the seabed laying material for improving the seafloor environment is transported and stored, it can be wound so as not to be bulky.

  Moreover, when laying this on the sea floor, the laid object in a rolled state can be transported to a predetermined sea area and laid on the sea floor while being rewound in water, so that the laying work is easy.

  In any of the methods for improving the seabed according to the inventions of claims 3 to 5, the anchors are attached to the required locations around the belt-like substrate of the above-mentioned seabed laying object, and only the required number of seabed laying objects are laid on the seabed. Since the environment can be improved, there is an advantage that the work is simple and the work cost is low.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In this specification, the term “front” refers to the side facing the water flow, the term “back” refers to the opposite side, and the term “right” refers to the left and right as viewed from the side facing the water flow. That is, in FIG. 2, the left side is the front, the right side is the rear, the rear side is the left, and the front side is the right.

  1 and 2 show an embodiment of the invention of claim 1. A seabed laying structure (A) for improving the seafloor environment according to the present invention comprises a mesh-like biodegradable fiber woven belt-like substrate (1) through which sludge passes, and a vertical row of the belt-like substrate (1) in the vertical direction. A plurality of slight intervals are arranged so as not to overlap each other, and the whole is made of a biodegradable fiber woven fabric and is composed of a trapezoidal water flow resistor (2) in a deployed state, and the water flow resistors (2) face each other. Of the front long side and the rear short side, the rear short side has substantially the same length as the lateral width of the belt-like substrate (1), and the left and right oblique sides are deformed so as to be parallel to the rear edge (3). And by sewing the left and right edge portions (4) and (5) to the belt-like substrate (1), the same between the front edge portion (6) of each water flow resistor (2) and the belt-like substrate (1). The forward opening (7) is formed.

  FIG. 3 is an explanatory diagram showing a process of forming the water flow resistor (2) on the strip substrate (1). That is, the water flow resistor (2) is composed of a trapezoidal piece (8) in the unfolded state as shown in FIG. 3 (a). By deforming the left and right oblique sides of the trapezoidal piece (8) so as to be parallel to each other and sewing the rear edge (3) and the left and right edges (4) (5) to the belt-like base (1), FIG. This is a water flow resistor (2) having a forward opening (7) as shown in 3 (b).

  FIG. 4 shows an embodiment of the invention of claim 3. In the seabed improvement method according to the present invention, an anchor (not shown) is attached to a required portion around the belt-like substrate (1) and the open part (7) of the total water flow resistor (2) is made to flow. By laying on the seabed (10) where the sludge (9) rich in organic matter exists so as to face the water, and covering the sludge (9) with the strip-shaped substrate (1), the water flow (11) is placed on the strip-shaped substrate (1). The water flow resistor (7) receives resistance on the inner surface of the water flow resistor (7), reversely flows while stirring, rises from the open portion (7), and stirs the organic matter settled above the seabed laying object (A). Causes of formation of anoxic water mass on the seabed (10) through the mesh of the net-like woven belt-like substrate (1) while preventing accumulation of (10) and forming anoxic water mass The sludge (9) is removed by stirring.

  FIG. 5 shows an embodiment of the invention of claim 4. In the seabed improvement method according to the present invention, an anchor (not shown) is attached to a required location around the belt-like substrate (1) and the open part (7) of the total water flow resistor (2) is made to flow. Laying on the seabed (12) of the closed sea area where anoxic water mass is likely to occur, and the water flow is subjected to resistance on the inner surface of each water flow resistor (2) on the strip substrate (1) and stirred. The organic matter that flows backward and rises from the open part (7) and settles above the seabed laying material (A) is stirred, and the organic matter is deposited on the seabed (10) to form an anoxic water mass. Is to prevent.

  FIG. 6 shows an embodiment of the invention of claim 5. In the seabed improvement method according to the present invention, the seabed environment improving seabed laying body (B), in which the entire belt-like substrate (1) and the water flow resistor (2) are made of woven fabric of biodegradable fibers, is required around the belt-like substrate (1). An anchor (not shown) is attached to the location, and the open part (7) of the total water flow resistor (2) is laid on the seabed (14) where an anoxic water mass exists so as to face the water stream. 14) prevents the sludge (15) rich in organic matter from rising, and the water flow (11) receives resistance on the inner surface of each water flow resistor (2) on the strip substrate (1) and stirs. While flowing back, it rises from the open part (7), stirs the organic matter that settles above the seabed laying material (B), and the organic matter accumulates on the seabed (14) and tries to form an anoxic water mass. This is to prevent this.

It is a perspective view which shows embodiment of invention of Claim 1. FIG. 2 is an enlarged side view taken along line II-II in FIG. 1. It is explanatory drawing which shows the process in which a water flow resistor is formed on a strip | belt-shaped base | substrate, 3 (a) has the back short side of the front long side and back short side which oppose substantially the same length as the horizontal width of a strip | belt-shaped base | substrate. FIG. 3 (b) shows a state in which the trapezoidal piece is arranged on the belt-like base, and FIG. 3 (b) shows that the left and right oblique sides of the trapezoidal piece are deformed so as to be parallel and are sewn to the belt-like base. The state made into the water flow resistor which has a forward opening part is shown. It is a longitudinal cross-sectional view which shows embodiment of invention of Claim 3. It is a longitudinal cross-sectional view which shows embodiment of invention of Claim 4. It is a longitudinal cross-sectional view which shows embodiment of invention of Claim 5.

Explanation of symbols

(1) Strip base made of reticulated biodegradable fiber fabric (2) Water flow resistor (3) Rear edge of water flow resistor (4) Left edge of water flow resistor (5) Right edge of water flow resistor (6) Front edge of water resistance (7) Open part of water resistance (8) Trapezoidal piece (9) Sludge (10) (12) (14) Sea bottom (11) (16) Water flow (13) Biodegradable fiber woven fabric Band-shaped substrate (15) Sludge rich in organic matter (A) (B) Submarine laying material for improving seafloor environment

Claims (5)

A strip-shaped substrate made of a flexible material, and a plurality of the strip-shaped base material are arranged on the strip-shaped substrate so as not to overlap each other in the longitudinal direction, and at least the rear edge portion and the left and right edge portions of the whole are flexible material It is made of a trapezoidal water flow resistor in the unfolded state, and the left and right sides of the trapezoidal water flow resistor are deformed so that they are parallel to each other, and the rear edge and the left and right edges are fixed to the belt-like substrate. A seabed laying structure for improving the seafloor environment in which a forward open part in the same direction is formed between the front edge part of the water flow resistor and the belt-like substrate. The flexible material of the strip substrate is a net-like woven fabric, woven fabric, non-woven fabric, knitted fabric, rubber or soft synthetic resin, and the flexible material used for at least the rear edge portion and the left and right edge portions of the entire water flow resistor is woven fabric. The seabed laying structure for improving the seafloor environment according to claim 1, wherein the seabed environment improving seabed environment is made of cloth, non-woven fabric, knitted fabric, rubber, or soft synthetic resin. Of the seabed layings for improving the seabed environment according to claim 1 or 2, an anchor is attached to a required place around the belt-like base material, wherein the flexible material of the belt-like base material is a mesh woven fabric through which sludge passes. By laying the open part of the total water flow resistor on the sea bottom where the sludge rich in organic matter exists so as to face the water flow, and covering the sludge with the belt-like substrate, the water flow is resisted on the inner surface of each water flow resistor on the belt-like substrate. And agitating the organic matter that flows backward while being stirred and rises from the open portion and sinks above the bottom of the seabed, and prevents the organic matter from depositing on the seabed and forming anoxic water masses. A method for improving the sea bottom, wherein the sludge that causes formation of anoxic water masses on the sea floor is stirred through the mesh of the belt-like substrate made of a net-like woven fabric and is removed. 3. Closeness which is easy to generate an anoxic water mass so that the seabed laying structure for improving the seabed environment according to claim 1 or 2 is attached to a required portion around the belt-like substrate and an open portion of the total water flow resistor is opposed to the water flow. Laying on the seabed of the seawater area, the water current receives resistance on the inner surface of each water flow resistor on the belt-like substrate, reversely flows while stirring, rises from the open part, and sinks organic matter above the seabed laying structure. A method for improving the seabed that stirs and prevents organic matter from accumulating on the seabed and forming anoxic water masses. Of the seabed laying material for improving the seabed environment according to claim 1 or 2, the seabed laying material in which the flexible material of the belt-shaped substrate does not allow sludge to pass is attached to an anchor at a required location around the belt-shaped substrate, and the total water flow resistance is obtained. The open part of the body is laid on the seabed where anoxic water mass exists so as to oppose the water flow, and it prevents the sludge rich in organic matter on the bottom of the laying from rising, and the water flow on the strip substrate Receiving resistance on the inner surface of each of the water flow resistors, the reverse flow while being stirred, rising from the open part, stirring the organic matter that settles above the seabed laying material, the organic matter is deposited on the seabed and the anoxic water mass is formed A method of improving the seabed that prevents it from forming.

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