JP3200421U - Fish run-up smoothing tilting device - Google Patents

Abstract

A tilting device with a fishway irrigation board is provided that eliminates the drop between a fishway and a fixed weir, assists smooth upward and downward movement of the fish, and maintains or restores the fish population. A water supply plate used for water intake is provided on the upstream side of a fishway installed in a fixed weir, and an upstream part 1 having a height almost equal to the height of a vertical water supply plate, and a fishway installed in the weir It consists of the inclined plate 3 which connects the downstream part which becomes the same level as this surface, and the bottom plate 4 in contact with the fishway. By installing the inclined plate 3 on the downstream side of the vertical irrigation plate in a manner that has little influence on the crossing workpiece, the vertical wall is eliminated and the fish can be moved up smoothly. In this way, both water utilization and environmental conservation (habitation of fish, etc.) will be achieved. [Selection] Figure 1

Description

The present invention relates to an inclination device attached to a fishway irrigation plate for allowing fish to run up.

  In Japan, there are many migratory fish that run up and down rivers such as ayu and salmon. River crossing structures (weirs) intended for irrigation water hinder this, and in recent years fish facilities have been established by facility managers or river managers.

  However, there are many cases where a vertical water supply plate for the purpose of taking water is installed at the top of the fishway, which significantly hinders the fish from going up (FIGS. 5 and 6). This is because even if the fish goes up the maintained fishway, the vertical water supply plate at the top becomes a wall.

  In addition, it is not easy to get the understanding of the water users (the manager of the crossing work (weir)) by manipulating the vertical irrigation board and the crossing work (weir) to improve the fish run-up. Absent.

JP2011-052504A

A simple fishway device that is different from a large-scale fishway with improvement work such as a weir is drawing attention. As an example, a siphon-type pipe fishway (Patent Document 1) has been invented, and it can be easily removed only by leaning this device against a weir. In addition, according to inquiries with river managers in each region, it has been reported that there are currently no structures and devices that have solved the problem of run-up due to the water supply plate at the top of the fishway.
Therefore, in the present invention, an inclined plate is installed on the downstream side of the vertical water supply plate in a way that has little effect on the crossing workpiece (a pool can be installed depending on the situation), so that the vertical wall can be eliminated and fish can be moved up. It is to make it smooth (FIGS. 7 and 8). In this way, both water utilization and environmental conservation (habitation of fish, etc.) will be achieved.

In consideration of realizing water utilization such as agriculture and fish run-up at the same time and making it easier for water users (managers of crossing works (weirs)) to understand, fixing only bolts and detaching from water utilization plates We have devised a tilting device attached to the fishway water plate.
As a result, the installed tilting device can be easily removed, and bolt type anchors (set anchors) are embedded in river structures (weirs) (small holes for bolts are drilled and bolt type anchors are bonded) Only by fixing with the agent etc.), the influence on the structure itself of the crossing workpiece (structural and strength) becomes extremely small without any changes to the water utilization plate.
In addition, the material is a lightweight device by using stainless steel (partially wood), and it is easy to transport and install and to extend the life of the material.

  Since the fishway diversion board-attached tilting device according to claims 1 to 7 need only be installed downstream of the weir without altering the weir at all, it does not affect the intake of irrigation water, and the fish run-up rate Can be increased.

  In the tilting device attached to the fishway irrigation board according to the fourth aspect, the uneven surface generates friction like an actual riverbed, so that aquatic organisms such as fish and crustaceans can climb up the slope without sliding down.

  The tilting device with a fishway diversion plate according to claim 4 exhibits a priming effect by utilizing the habit of gathering where there is a wave by generating bubbles on the downstream surface of the tilting device by irregularly flowing down the water flowing on the uneven surface. However, when the fish reaches the vicinity of the weir, it is possible to gather in the vicinity of the fishway device without hesitation.

  The inclination device attached to the fishway diversion plate according to claim 5 does not diffuse the flow direction of the flowing water by a flange installed on the upper surface of the inclined plate and further amplifies the flow velocity, so that a large ripple can be caused in the downstream portion, and the priming effect is exhibited. However, when the fish reaches the vicinity of the weir, it is possible to gather in the vicinity of the fishway device without hesitation.

  The fishway irrigation board-attached tilting apparatus according to claim 6 is provided with a pool between the tilting board and the irrigation board, so that small fish and the like can rest over the weir while resting, and smooth running up can be achieved.

  In order to confirm the effect of the present invention as shown in FIG.

  A fishway irrigation board-attached tilting device having an oblique side of 60 cm, a base of 50 cm, a base of 50 cm, an opposite side of 40 cm, and an inclination angle of 30 degrees was prepared.

  The demonstration experiment was carried out only by those involved in the design in the Hiyodogawa (Higashisonogi-cho, Higashisonogi-gun, Nagasaki Prefecture) near the place of residence of the co-inventor.

  The first demonstration was November 4, 2014, 13: 00 to 15:00, the second was April 15, 2015, 13: 00 to 15:00, and the third was May 2015. It went from 14:00 to 16:00 on the 30th.

  In the first round, we installed an inclining device attached to the fishway irrigation board directly in the river, and confirmed how water flows on the inclined surface (Fig. 6).

  As a result of the experiment, water did not leak from the side surface of the inclined surface, and the amount of water required to bring fish into the inclined surface flowed along the flange on the side surface.

  The second round was conducted using 50 juvenile sweetfish that were sized to run up when using the tilting device attached to the fishway.

  In order to experiment with a limited number of juvenile sweetfish, a head of a weir part and a fishway part is provided in a rectangular container of 2m x 1m x 1m in a rectangular container of 2m x 1m x 1m without being discharged directly into the river. A fishway diversion board attached tilting device was installed in the area, and the situation of the fish going up was confirmed.

  As a result of the experiment, it was confirmed that if there is no fishway diversion board attached tilting device, it is not possible to go up by a head.

  It was confirmed that Ayu goes up the inclined surface when the tilting device attached to the fishway irrigation board is installed.

  The third experiment was conducted under the same conditions. At this time, other than Ayu, fish living in the Hikawa River were also used as target fish.

  As a result of the experiment, it was confirmed that Oikawa ascends by using a tilting device attached to a fishway irrigation board in addition to Ayu (Fig. 8).

The perspective view (with a pool) of this apparatus. Top view of the device (with pool). Side view of the device (with pool). Front view of the device (with pool). A picture of the structure of weirs, irrigation boards and fishways in small and medium rivers A picture of the structure of squeeze board and fishway in small and medium rivers. A picture of the installation of this device in a small and medium river (no pool). A photo of the use of the present invention (fish going up) (no pool).

In order to help the fish, such as sweetfish, run up by installing the fishway diversion board attached tilting device, which is the present invention, just below the vertical water diversion plate located at the top of the fishway that is installed in the weir for taking agricultural water I made it.
In such a river, it has the role of increasing the run-up rate and is easily understood by water users (crossing work (weir) managers), and can be installed in rivers throughout the country.

One embodiment of the present invention will be described below, but the scope of claims of the present invention is not limited by these.
FIG. 1 is a perspective view showing a device according to the present embodiment. FIG. 2 is a top view of the apparatus. FIG. 3 is a side view of the apparatus. FIG. 4 is a front view of the apparatus.

  As shown in FIG. 1 to FIG. 4, this apparatus has an angle similar to that of the riverbed gradient so that the fish can rise slowly with respect to the vertical water utilization plate.

  1-4, this apparatus is comprised from the supporting member of the codes | symbols 1-7.

  This device uses plates 1, 3, 4, and 7 and is configured in a right triangle shape.

  This apparatus can also be configured to have a rectangular pool (reservoir) indicated by reference numerals 7a to 7c and use plates of reference numerals 1, 3, 4, and 7.

  This right triangle-shaped device is composed of an inclined plate indicated by reference numeral 3, a bottom plate indicated by reference numeral 4, a water storage section constituted by reference numerals 7a to 7b, and the like.

  The flange of the code | symbol 2 is installed in the both sides of the inclination board which comprises the slope of this apparatus.

  In the present embodiment, the material of the support members 1, 2, 3, and 7 is wood, but a thinner stainless steel material can be used, or a plastic material can be integrally formed.

  The size of the support members denoted by reference numerals 1 to 7 of the present apparatus can be appropriately changed depending on the river to be installed and the scale of the weir.

  The angle formed by the bottom plate and the inclined plate of reference numbers 3 and 4 of this device is set appropriately according to the height of the river weir and the riverbed slope.

  The uneven surface 3a can be provided separately on the slope of reference numeral 3 of this apparatus by mounting a plate or digging a groove in the inclined portion.

  The fixing method of this apparatus includes a water supply plate fixing type provided with fixing means for directly attaching and fixing the upstream portion 1 to the water use plate and a river bed fixing type for fixing the bottom plate to the river bed.

  The water supply plate fixing type fixing method is carried out by directly fitting the upstream member of reference numeral 1 into the water supply plate fitting portion of the fixed weir.

  The fixing method of the irrigation plate fixing type is not limited to the fixing method in which the irrigation plate is directly fitted into the portion where the irrigation plate is fitted, and various fixing means can be employed.

  A hole for fixing is provided at the bottom, and a bottom plate of 4 is fixed to the river bed using nuts of 5 and 6 and bolt type anchors.

  The fixing method of the river bed fixing type is not limited to the nuts and bolts denoted by reference numerals 5 and 6, and various fixing means can be appropriately employed.

  This fixed device is a removable type that can be removed because it is not necessary when there is no hindrance from going up by the water supply plate.

There are countless weirs in Japan that take agricultural water from rivers. Many of them are equipped with fishways and are gradually being installed in the weirs where there were no fishways. However, not all of them can be seen, but there are many vertical irrigation boards. Although these fishways are intended to run up fish such as sweetfish, the rate of going up has been lowered due to the vertical water irrigation board installed at the top of the fishway.
The incline device attached to the fishway irrigation board, which is the present invention, serves to increase the run-up rate in such rivers and is easy to understand for water users (crossing work (weir) managers). Can be introduced.

  In terms of cost, the installation and improvement of the fishway, which is generally carried out together with the improvement of the weir, requires more than 10 million yen, so the maintenance of the fishway has not caught up with all the weirs. However, the tilting device attached to the fishway irrigation board, which is the present invention, is an article that does not involve any improvement work. Widely used in many rivers.

1: Upstream part 2: Flange part (2a: left side flange, 2b: right side flange)
3: Inclined plate (3a: uneven surface)
4: Bottom plate 5: Nut (fixes fishway and lower plate)
6: Bolt type anchor 7: Pool part

The perspective view (with a pool) of this apparatus. Top view of the device (with pool). Side view of the device (with pool). Front view of the device (with pool). A picture of the structure of weirs, irrigation boards and fishways in small and medium rivers A picture of the structure of squeeze board and fishway in small and medium rivers. A picture of the installation of this device in a small and medium river (no pool). A photo of the use of the present invention (fish going up) (no pool).

  In terms of cost, the installation and improvement of the fishway, which is generally carried out together with the improvement of the weir, requires more than 10 million yen, so the maintenance of the fishway has not caught up with all the weirs. However, the tilting device attached to the fishway irrigation board, which is the present invention, is an article that does not involve improvement work. Widely used in many rivers.

Claims (7)

  A water supply plate used for water intake is provided upstream of the fishway installed in the fixed weir, and the upstream part has a height approximately equal to the height of the vertical water supply plate and the surface of the fishway installed in the weir. A fishway irrigation board-attached tilting device consisting of a sloped part connecting downstream parts of the same level and a bottom part in contact with the fishway.   2. The fishway irrigation board-attached tilting device according to claim 1, further comprising fixing means for directly attaching and fixing the upstream portion to the irrigation board.   2. The fishway irrigation board-attached tilting device according to claim 1, wherein the upstream portion directly functions as the irrigation board.   2. A fishway irrigation board-attached tilting device according to claim 1, wherein an uneven surface is provided on the tilted portion.   2. The fishway diversion board-attached tilting device according to claim 1, wherein flanges are installed at both ends of the sloped portion so as not to diffuse the flow direction of running water and to amplify the flow velocity.   2. The fishway irrigation board-attached inclination device according to claim 1, wherein a pool portion is installed between the inclination board and the irrigation board.   The fishway diversion board-attached tilting device according to claim 1, wherein a hole for fixing is provided at the bottom corresponding to the fixing device provided in the fixing weir.