TWM626669U - zigzag fishway structure - Google Patents

Abstract

The zigzag fishway structure is to construct the fishway along the downstream side of the horizontal structure on the river bed. It can be built at the same time as the new horizontal structure, or it can be added to the existing horizontal structure. The entrance of the zigzag fishway is connected to the horizontal structure. The position of the river channel flow center upstream of the structure, the outlet of the tortuous fishway is connected to the downstream channel flow center position of the horizontal structure, and the tortuous path is used to increase the flow path. The elevation of the spillway of the water wall decreases one by one from top to bottom, reducing the height difference so that fish in the river can use the fishway to go up. In addition, a water storage tank can be formed between the cutoff walls, in order to consider the fish's jumping ability and sprint endurance, so that the fish can rest properly during the migration process, avoid excessive fatigue, and create a flow condition suitable for fish migration.

Description

zigzag fishway structure

This zigzag fishway structure is a kind of fishway building structure. The fishway building is often installed downstream of the water level drop structures (such as sand control dams, weirs, hereinafter referred to as lateral structures), so that fish can migrate over the lateral structures to avoid The biological corridor is interrupted. In this structure, the fishway is constructed along the downstream side of the horizontal structure on the river bed, wherein the entrance of the tortuous fishway is connected to the upstream of the horizontal structure, and the outlet of the tortuous fishway is connected to the downstream of the horizontal structure. , Through the meandering fishway structure, the height difference of the river channel is reduced for fish migration. The above meandering fishway structure can be built at the same time as the new horizontal structure, or can be added to the existing horizontal structure.

In Taiwan, affected by the terrain, the slopes are steep and the water is fast. The turbulent water often scours the river slopes and causes soil and rock loss. In order to avoid the continuous deep brushing of the creek bed and affect the stability of the river, lateral structures such as sand control dams are often set up to control, or because of water storage. For the purpose of setting up horizontal structures such as weirs and embankments to store water sources. Due to the above-mentioned horizontal structures such as sand control dams or weir embankments, height differences will be formed after installation, resulting in interruption of biological corridors, and fish cannot migrate upstream or downstream smoothly, returning to appropriate habitats to spawn, and eventually their habitats will be reduced. and fragmentation.

In order to solve the above problems, artificial means are used to provide fish migration channels, so that they can cross the height difference of horizontal structures, so as to meet various needs of life and maintain the integrity of the habitat, for the purpose of setting up fish passages.

At present, the common types of fishways include pool type, waterway type and operation type, etc. Most of the fishways are equipped with baffles or flow blocking structures along the flow direction of the water. The difference is divided into several levels, and slow currents and rapid currents are formed in the fishway to create a flow condition suitable for fish migration. All types of fishways have their own characteristics and applicability. The design considerations include the speed, flow, water depth, and drop of each part. Height, sand deposition and sand discharge capacity, target fish characteristics, cost-effectiveness, maintenance management, etc.

Due to the limitations in the application of traditional fishways, such as being prone to soil and sand deposition, regular dredging is required, which makes the maintenance cost extremely high, or due to changes in flow conditions, stream water cannot enter the fishway for normal discharge, causing it to lose its function. In order to expand the applicability of the fish pass and make it more widely used, the novel zigzag fish pass structure is proposed.

The purpose of the novel zigzag fishway structure is to provide a fishway building structure, in which the zigzag fishway is measured downstream along the lateral structures (such as sand control dams, weir embankments) placed across the river bed, wherein the entrance of the zigzag fishway is It connects the upstream channel flow center of the lateral structure, and the outlet of the zigzag fishway connects the downstream channel flow center position of the transverse structure, and reduces the height difference of the river channel through the zigzag fish channel. There are several intercepting walls with vertical flow cores in the meandering fishway. The elevation of the overflow outlet of the intercepting walls decreases one by one from top to bottom, and a water storage tank is formed between the intercepting walls. In addition, the zigzag fishway can turn 180 degrees through at least one flow center, and is divided by the first diversion wall to extend the length of the fishway.

The novel zigzag fishway structure includes a waterway with a fixed width, and the direction of water flow in the waterway is parallel to the horizontal structures on the riverway.

The novel zigzag fishway structure includes a plurality of intercepting walls with vertical flow cores, the plurality of intercepting walls are arranged at intervals, and the elevation of the overflow outlet of the intercepting walls decreases one by one from top to bottom.

In this new type of zigzag fishway structure, a water storage tank is formed between the two intercepting walls, and the water storage tanks are connected with each other. , it can produce waterfalls in the water storage space and create an ecological environment that aquatic creatures like.

The novel zigzag fishway structure can turn 180 degrees through at least one flow center, and is divided by the first diversion wall to extend the length of the fishway.

The novel zigzag fishway structure can be constructed simultaneously with the new horizontal structure.

The novel zigzag fishway structure can add buildings to existing horizontal structures.

The novel zigzag fishway structure is built on the downstream side of the horizontal structure, and is also close to the horizontal structure, instead of being set on both sides of the river. The soil and sand of a certain particle size can be naturally moved down by the natural scouring force of the water flow. , to avoid loss of function caused by excessive siltation.

The novel zigzag fishway structure is built on the downstream side of the lateral structure, and is also close to the lateral structure, rather than on both sides of the river. its service life.

1: Horizontal structure

1a: Left wing wall of lateral structure

1b: Right wing wall of transverse structure

2: Diversion first wall

3: Diversion second wall

4: Entrance

5: cut-off wall

6: Reservoir

7: Turning area

8: Sand blocking area

9: Export

[Figure 1] is a three-dimensional view of the new tortuous fishway structure.

In order to clearly illustrate the features and advantages of the novel zigzag fishway structure, the following will describe the embodiments in detail with the drawings, but the drawings are for illustrative purposes only, and do not represent the actual size or quantity.

Please refer to FIG. 1 , which is an embodiment of the novel zigzag fishway structure, which is measured downstream along the newly built lateral structure on the river bed or the existing lateral structure 1, and the upstream side is the sand trapping area 8, and It includes the left wing wall 1a and the right wing wall 1b, wherein the inlet 4 of the zigzag fishway structure is connected to the upstream channel flow center of the transverse structure, and the zigzag fishway structure outlet 9 is connected to the downstream channel flow center of the transverse structure.

In the zigzag fishway structure, it includes a channel of fixed width, and the direction of water flow in the channel is parallel to the horizontal structures on the channel, which are called the first diversion wall 2 and the diversion second wall 3. There are several intercepting walls 5 with vertical flow cores. The elevation of the overflow outlet of the intercepting wall decreases one by one from top to bottom. Through the elevation control, the water flow flows from the high water level to the low water level, and descends in sequence to form a water storage tank 6 , Each water storage tank is connected to each other, and the bottom of the tank can be laid with stones, sand and gravel or planted with water plants to create a good habitat environment.

In addition, the zigzag fishway can pass through at least one 180-degree turning area 7 of the flow center, and is divided by the first diversion wall 2 to extend the length of the fishway.

1: Horizontal structure

1a: Left wing wall of lateral structure

1b: Right wing wall of transverse structure

2: Diversion first wall

3: Diversion second wall

4: Entrance

5: cut-off wall

6: Reservoir

7: Turning area

8: Sand blocking area

9: Export

Claims (8)

A zigzag fishway structure is constructed along the downstream side of the horizontal structure on the river bed, which is located on the left and right sides of the river channel, and bank protection must be installed to protect the slopes on both banks, wherein the entrance of the zigzag fishway is connected to the horizontal structure. The position of the flow center of the upstream river channel, the outlet of the tortuous fishway is connected to the position of the flow center of the downstream river channel of the horizontal structure, and the height difference of the river channel is reduced through the interception walls of several vertical flow centers in the tortuous fishway. For the tortuous fishway structure described in item 1 of the scope of the patent application, the outlet of the tortuous fishway is connected to the downstream of the horizontal structure, and the difference between the elevation of the overflow outlet and the elevation of the river is controlled within 25-50 cm. For the meandering fishway structure described in item 1 of the scope of application, the entrance of the meandering fishway is connected to the upstream of the horizontal structure at the flow center of the river, and co-constructs with the spillway of the lateral structure, and its entrance elevation needs to be higher than that of the lateral structure. The elevation of the spillway is 25-50 cm lower. For the zigzag fishway structure described in item 1 of the scope of the application, revetments are installed on the left and right sides of the river channel, and the top elevation of the revetment must be equal to the top elevation of the lateral structure wing wall. For the zigzag fishway structure described in item 1 of the scope of the patent application, several intercepting walls are arranged between the first diversion wall and the second diversion wall, and the elevation of the overflow outlet of the intercepting walls decreases one by one from top to bottom. , the difference in elevation of the spillway of each two consecutive interception walls is controlled at 25-50 cm. As for the zigzag fishway structure described in the first item of the scope of the patent application, one deep groove gap can be set at the overflow outlet of each intercepting wall, the purpose is to ensure that the water flow can flow out from the deep groove gap when the water volume is small. The meandering fishway structure as described in item 1 of the scope of the application, wherein the meandering fishway can turn 180 degrees through at least one flow center, and is divided by a first diversion wall, the top elevation of the diversion first wall The spillway of each interception wall should be decreased gradually, and it should be greater than the elevation of the interception wall spillway, and the highest elevation of the interception wall should not exceed the elevation of the spillway of the lateral structure. For the zigzag fishway structure described in Item 1 of the scope of the application, a water storage tank is formed between two continuous cutoff walls through elevation control, so that fish can rest properly during the migration process and avoid excessive fatigue. Stones, Sand or plant water plants to create a good habitat environment.

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