JP4243712B2 - Laying the foundation for the construction of underwater seed plants - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to laying methods Construction foundation aquatic seed plants.
[0002]
[Prior art]
In recent years, due to the development of coastal areas, the suitable habitat of aquatic seed plants such as sea cucumbers has been remarkably reduced. For this reason, artificially creating aquatic seed plant fields has been attempted.
As a seeding sheet and seeding method for the formation of this eelgrass, a seeding sheet in which the seeds of sea eels are fixed to a predetermined seeding density on a net-like sheet member made of a biodegradable resin and rolled into a roll is manufactured. There is an invention in which a seeding sheet is spread and laid on a water bottom for forming a eel with a laying device (see, for example, Patent Document 1).
[0003]
In addition, the weight of the accumulated sand is measured under a bottomed box-shaped superstructure formed by a net that has holes drilled through it, which is formed so that the accumulated drifting sand slightly covers the surface. A net-like substructure with a hole that can be caught by the rhizomes is arranged. And, between the superstructure and the substructure, there is an intermediate section that has a wall body with a flow velocity damping function that is suitable for catching drifting sand in front of the waves, and partly built with amamo seeds There is an invention in which a seeding bag is disposed, and a plate-shaped stabilizer for preventing scouring of the end portion is disposed around the seeding bag. The superstructure and the middle section are formed of a metal material that spontaneously corrodes and disappears in seawater (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-42626 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-171852
[Problems to be solved by the invention]
The invention described in Patent Document 1 moves a trolley loaded with a seeding sheet wound in a roll on a rotating body to a destination, sets the rotating body on a lifting device, drops it into the sea with a crane, and sowing Since the sheet is laid on the sea floor while expanding the sheet, there is a problem that the laying facility becomes very large and a high laying cost is required.
In addition, since the seeding sheet becomes longer when it is spread out, it does not fit on the sea floor where there are irregularities or rocks, and it cannot move after laying. There is a risk that it will not grow.
[0006]
The invention described in Patent Document 2 has a complicated structure because it consists of many members such as an upper work, a middle work, a stabilization work, and a lower work, and the overall shape of the work reaches 900 × 900 × 50 (mm). For this reason, it is a size that does not hinder transportation on land, but it is difficult to move underwater because of its high resistance to water. In addition, the seeds of sea cucumber are difficult to germinate because they are contained in a bag, and there is a problem that rooting is difficult even after germination and the fixability is poor.
Further, the seeds and seedlings of sea cucumbers die when dried, so it is necessary to keep them always moist. However, in Patent Document 1, there is a description of preventing drying by enclosing seeds of eel in a capsule or coating the surface of the seed, but no specific means is described. No. 2 does not describe measures for preventing dryness.
[0007]
The present invention has been made to solve the above-mentioned problems, and is made of a material that naturally decomposes, and has a small, lightweight and simple structure with seeds or seedlings of underwater seed plants. the construction foundation underwater seed plants that may be, it is intended to provide a laying設方method that can in be laid in the water regardless of the season by easy single equipment and means.
[0008]
[Means for Solving the Problems]
(1) A method for laying a foundation for creating an underwater seed plant according to the present invention includes first and second base materials having holes through which a sprouted grass body is made of organic fibers that naturally decompose and materials that naturally decompose. A felt-like first mat having holes through which germinated roots and rhizomes can pass, and a second mat having holes through which germinated grasses made of organic fibers that naturally decompose can pass through, Extending sand mud or the like mixed with seeds on the first mat placed on the first base material, placing the second mat and the second base material on the first mat sequentially, A plurality of foundations formed by fixing peripheral edges of the first and second base materials by a plurality of fixtures made of a material that naturally decomposes are connected by ropes made of a material that naturally decomposes, and sequentially in the laying water area. so as to laying in the bottom of the water and drop-off in water It is intended.
[0009]
( 2 ) The creation base of the above ( 1 ) was accommodated in the creation base transport container and transported to the laying water area in a constantly wet state.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
FIG. 1 is a schematic view showing a part of the formation base of an underwater seed plant according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view thereof. In addition, in the following description, the case where an ammo is created as an underwater seed plant is demonstrated.
In both figures, 1 is the foundation of the Amamo. Reference numeral 2 denotes a first base material made of a metal material that naturally corrodes and decomposes in the sea, such as a wire mesh made of steel, and has a large number of holes (mesh) that are large enough to allow the germinated shellfish to pass through. Is provided. Reference numeral 3 denotes a second substrate having the same material and the same structure as the first substrate 2, and both the substrates 2 and 3 have a length and width of about 500 mm. In addition, you may provide the frame of frame shape which consists of a metal material which corrodes naturally and decomposes | disassembles on the outer periphery of the 1st, 2nd base materials 2 and 3. FIG. The first and second base materials 2 and 3 may be made of steel advanced metal or punching metal instead of the wire mesh.
[0013]
4 is made of a naturally degradable material such as natural fiber or biodegradable fiber, and a felt-like first mat having a large number of small holes through which the roots and rhizomes of germinated eelgrass can pass. It is a second mat made of a naturally degradable material such as natural fiber or biodegradable fiber, and has a large number of holes (mesh) with a size through which germinated eelgrass can pass through. The mats 4 and 5 are formed to be approximately the same size or slightly smaller than the first and second substrates 2 and 3. Reference numeral 6 denotes sand mud or sand mud (hereinafter referred to as sand mud or the like) mixed with sea eel seeds.
[0014]
In assembling the formation base 1 composed of the above-described members, first, the first mat 4 is placed on the first base material 2, and then the eel seeds are placed on the first mat 4. The mixed sand mud 6 and the like is raised and leveled so that the seeds are distributed almost uniformly at a predetermined density over almost the entire surface of the first mat 4 and flattened. At this time, fertilizer may be mixed into the sand mud 6.
Next, the second mat 5 is placed on the first mat 4, and the second substrate 3 is placed thereon. And the peripheral part of the 1st, 2nd base materials 2 and 3 provided in the upper and lower sides is made of a plurality of fixtures (not shown) such as steel clips made of a material that naturally corrodes and decomposes. Hold it together and fix it together.
[0015]
Thereby, sand mud etc. 6 mixed with seeds of sea cucumber is sandwiched between the first and second mats 4 and 5 and reliably held.
Thus, since the structure base 1 which concerns on this invention does not use a special material and its structure is simple, it can be manufactured easily and cheaply. The creation base 1 has a size of about 500 mm in length, 500 mm in width, and about 10 to 15 mm in thickness (height), for example, the weight of the base body is about 3 kg, and sand mud or the like 6 mixed with seagull seeds is used. The total weight when it is disposed between the first and second mats 4 and 5 is about 5 kg.
[0016]
The creation base 1 as described above is manufactured in advance in a factory or the like, and is immersed and stored in a water tank or the like. For this reason, in some seasons, the seeds of eelgrass germinate, the grass body may extend from the holes of the second mat 5 and the second base material 3, and the roots are entangled with the first mat 4 and partly Although the roots of the roots may extend from the holes of the first mat 4, there is no problem in laying on the sea floor unless the roots become too long.
[0017]
Next, an example of a procedure for laying the creation base 1 configured as described above on the seabed will be described.
First, as shown in FIG. 3, a plurality of constructed bases 1 are connected by two ropes 10 having a predetermined length made of a natural material and a material that is naturally decomposed, and loaded into a small ship 11 to the laid sea area. Carry. In addition, the length of the rope 10 is appropriately set depending on the laying location, the laying density, and other conditions.
[0018]
By the way, as mentioned above, the seeds and seedlings of sea cucumbers die when dried, so it is necessary to keep them always moist. For this reason, when laying, while moving from a storage place such as a factory (for example, in a water tank) to the laying sea area, it is accommodated in a construction base transport container 20 (hereinafter referred to as a transport container) as shown in FIG. Carried while keeping the state.
[0019]
In FIG. 4, reference numeral 21 denotes a box-shaped container body having an open front surface that constitutes the transport container 20, and shelf boards 22 are provided on the inner walls of both side plates so as to oppose each other at an appropriate interval in the vertical direction. Is provided with a spraying member 23 such as a wire mesh for spraying seawater in the container body 1. In addition, although the figure showed the case where the front surface of the container main body 21 was opened, in order to maintain a wet state more definitely, it is desirable to close the opening part of a front surface with a door.
The creation base 1 is inserted into the container main body 21 and is sequentially placed on the shelf board 22 and transported to the laying sea area. During this time, for example, if the seawater is appropriately poured into the container body 1 by the bucket 24 and sprayed into the container main body 1, the seawater flows down through the respective foundations 1 and flows out of the container main body 21 from the lower part. As a result, the creation base 1, and thus the seeds and seedlings of the eels can always be kept moist, and the eels sowed or raised in remote places can be transported safely. In addition, although the case where seawater was supplied with a bucket was shown, an appropriate means can be used for water supply of seawater, for example, pumping up seawater with a pump and supplying water automatically.
[0020]
When the laying ship 11 reaches the laying sea area, as shown in FIG. 3, the construction base 1 taken out from the transport container 20 is connected with a rope 10, and is sequentially drawn out from the stern and descends into the sea, and the construction base at the tip portion. 1 is fixed to the sea floor with a pile 12 or the like. The foundation 1 dropped into the sea sinks due to its own weight, and is laid on the seabed at a predetermined interval (corresponding to the length of the rope 10). In addition, since the thickness (height) is thin (for example, about 10 to 15 mm), the foundation 1 according to the present invention is not easily affected by waves or the like. However, when the sea conditions are severe and difficult to stabilize, each foundation 1 What is necessary is just to fix to the seabed by a pile etc. every time or at an appropriate interval.
[0021]
When laying the foundation 1, the laying boat is small, so it is possible to enter shallow water (eg, about 2m in depth) suitable for the eelgrass to prosper, thereby greatly expanding the area of the foundation 1 be able to.
In addition, since the plurality of creation bases 1 are connected by the rope 10 and sequentially dropped into the sea, the laying work is easy and the work efficiency can be greatly improved. Furthermore, by connecting a plurality of small-sized foundations 1 with ropes 10, the interval and quantity of the foundations 1 can be adjusted according to the state of the laying sea area, so that it is possible to cope with complicated submarine topography.
[0022]
Further, depending on the state of the laid seabed, there is a case where it is desired to move a part of the foundation 1, but since the foundation 1 according to the present invention is small and light and has low resistance to water, it is preferable for one diver 13. Can be moved to.
In addition, since heavy machinery is not used when laying, for example, when laying the construction base 1 in a shallow sea area at low tide etc., a fisherman who needs to build an ammo ground without requiring a diver 13 Can also be laid.
[0023]
Moreover, since the creation base 1 is small and can be connected by the rope 10, it is possible to easily create a large-scale eelgrass field and to efficiently create a small-scale eelgrass field. Furthermore, if necessary, a small-scale suitable site selection test can be performed before the construction of a large-scale eelgrass field.
[0024]
The foundation 1 laid on the seabed in this way has the seeds of eelgrass germinated or the seedlings grow and their roots and rhizomes extend to the first mat 4 and the second mat 5 and the second mat. It grows upward through the hole of the base material 3 and grows to form an Amamo community. And as the eel grows, the roots and rhizomes of the eel extend to the natural ground at the bottom of the sea.
In this way, in the present invention, sand mud or the like 6 mixed with sea eel seeds is sandwiched between the first mat 4 having a small hole on the lower surface and the second mat 5 having a large hole on the upper surface. Since it is held, the germination rate of sea cucumber seeds and the fixation rate of roots and rhizomes after germination can be greatly improved.
[0025]
In addition, since the foundation 1 is made of a material that decomposes naturally due to corrosion, it naturally decomposes and disappears over time, leaving only the eelgrass community, and the ground is stabilized by the roots and underground stems of the eelgrass. Amamo community is maintained.
[0026]
[Embodiment 2]
In the first embodiment, sand mud or the like 6 mixed with sea cucumber seeds is held between the first mat 4 having a small hole and the second mat 5 having a large hole. The first mat 4 may be a mat having a hole having the same size as the second mat 5. Thereby, workability can be improved.
[0027]
In the above description, the case where the construction base 1 in which the sand mud or the like 6 in which the seeds of sea eel are mixed is held between the first mat 4 and the second mat 5 is laid on the sea floor is shown. For example, it is possible to lay the undersea seedlings sprouted from the development base 1 in the sea after raising them. Thus, the formation base 1 can be laid in the sea at any time regardless of the season by forming the formation base 1 in a state where the eel is in the seed state or in the state where the sprouted seedling is grown.
[0028]
Further, in the above description, the case where the eelgrass field is created in the sea by the creation base 1 incorporating the seeds of eelgrass is shown, but the present invention is not limited to this, and is grown and grown in seawater or fresh water. The present invention can also be implemented for the construction of other underwater seed plant sites.
[0029]
【The invention's effect】
The present invention extends sand mud mixed with seeds on a first mat placed on a first substrate, and a second mat and a second substrate are placed on the first mat. The first and second bases are placed one after the other, and the peripheral parts of the first and second bases are fixed with a plurality of fixtures made of a material that naturally decomposes. Since it was transported to the water area and then dropped and laid in the water, it can be laid in the water easily and can be laid in shallow water areas, so that the laying area by the laying ship can be expanded. Moreover, since the creation base is small and light, the laying position can be easily adjusted by moving the dropped construction base.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a part of a creation base according to an embodiment of the present invention in cross section.
FIG. 2 is an exploded perspective view of FIG. 1;
FIG. 3 is an explanatory diagram of a method for laying a creation base according to the present invention.
FIG. 4 is an explanatory diagram of a transport container used for transporting a creation base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Formation base of underwater seed plant 2 1st base material 3 2nd base material 4 1st mat 5 2nd mat 6 Sand mud etc. which mixed seed 10 Rope 11 Laying ship 20 Creation base transport container

Claims (2)

A first felt-like first base material having holes through which a sprouted grass made of a material that naturally decomposes can pass, and a hole made of organic fibers that naturally decompose, through which the sprouted roots and underground stems can pass. And a second mat having a hole through which a sprouted grass body is made of organic fibers that naturally decompose,
Sand mud or the like mixed with seeds is extended on the first mat placed on the first base material, and the second mat and the second base material are sequentially placed on the first mat. And connecting a plurality of constructed bases fixed by a plurality of fixtures made of a material that naturally decomposes the peripheral portions of the first and second bases with ropes made of a material that naturally decomposes, A method for laying a foundation for creating an underwater seed plant, wherein the plant is dropped into water and laid on the bottom. It said Construction base housed in reclamation infrastructure transport vessel, laying methods Construction foundation water seed plants of claim 1, wherein the transporting the laid water maintained constantly wet.

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