CN114718019A - Flexible flow-limiting salty-resistance device and salty-resistance method - Google Patents

Abstract

The invention discloses a flexible current limiting salt blocking device and a salt blocking method. The device comprises a plurality of first pile foundations arranged on the river bed of a first section of a river channel, a plurality of second pile foundations arranged on the river bed of a second section of the river channel, and a plurality of buoys , A number of cables, arresting nets, the first water blocking cloth and the second water blocking cloth, when the tide is high, under the action of water flow, the buoy moves upstream until the cable between the first downstream pile foundation and the buoy is tightened, and the buoy stops Movement; under the action of water flow, the first water blocking cloth and the second water blocking cloth are attached to the blocking net to form a cross section of the river, which reduces the cross section of the water; because the height of the blocking net is greater than that of the first blocking cloth and the second blocking net The sum of the heights of the water-blocking cloth, so there is a gap between the first water-blocking cloth and the second water-blocking cloth that can pass water to reduce the force on the cable; when the tide is low, the first water-blocking cloth and the second water-blocking cloth Under the action of the tide, it leaves the blocking net, and the ebb current flows down normally. The present invention is flexible and economical, and can be installed and disassembled in a short period of time.

Description

A flexible current limiting salt blocking device and salt blocking method

technical field

The invention relates to the technical field of estuary salt tide suppression, and more particularly, to a flexible current limiting salt blocking device and a salt blocking method.

Background technique

Salt tide is a unique natural phenomenon in the estuary area of rivers. Salt tide intrusion refers to the phenomenon that high salt water outside the estuary is transported and mixed up along the estuary with the rising and falling of tides, causing the water body in the upstream channel to become salty. For example, due to factors such as dry water in the upper reaches of the Pearl River Basin in winter, rising sea levels, and incision of the river channel, the frequent outbreaks of salt tides in the Pearl River Estuary area led to the emergence of super-standard salt water at the water intake of the upstream water plant, resulting in the water plant being unable to obtain fresh water. Affect water supply security.

In order to prevent or reduce the disasters caused by the intrusion of salt tide, satellite remote sensing technology is often used to invert the water surface salinity in the estuary area, and the salt tide is predicted based on the salinity of water samples at hydrological stations. Corresponding measures are taken to suppress the salty tide according to the forecast of the salty tide. The "upper replenishment" salt tide prevention and control technology for water pressure adjustment in the backbone reservoirs of the Pearl River Basin has basically matured. At the same time, the "middle storage" of the delta raw water intake, transportation, storage and supply system is also gradually playing its role. In the water year, there is still no effective measures to deal with the salt tide. The research and development of estuary blocking technology and the construction of a comprehensive prevention and control system of "upper replenishment-middle storage-lower resistance" in the Pearl River Estuary are of great significance to the security of water supply.

As early as 1988 and 1999, the submerged dam was applied to the Mississippi River in the United States as a lower salt suppression engineering measure. The submerged dam was built with the sediment of the river bed before the dry season, and after the completion of the salt suppression effect, the flood during the flood season will be used. The submerged dam is flushed, and it has been proved by practice that the submerged dam can effectively prevent the intrusion of the salt water wedge, thereby inhibiting the upward movement of the salt tide. However, the amount of submerged dams is huge and cannot be reused, and it is only effective for weakly mixed estuaries, and has little effect on strong mixed estuaries.

Patent CN108914875A discloses an underwater water curtain method for the prevention and control of estuary salt tide. By absorbing the upper layer of fresh water and ejecting the fresh water at the bottom, it lifts and promotes the stirring of the bottom salt water mass, destroys the salt water wedge structure, and reduces the salinity of the river; The local forecasted salinity automatically adjusts the water spraying amount, reducing the water spraying amount when the salinity is low, and increasing the water spraying amount when the salinity is high, so that the salt water mass is fully contacted with fresh water, reducing the salinity of the river, and providing water for the estuary area. in accordance with. This technology requires the use of multiple high-power pumps to pump water and the construction of an estuary platform, so its construction cost is high. In addition, the high-power water pump will generate more power consumption when in use, and the use cost is also relatively high.

Patent CN 107059762A discloses a saltwater wedge upward restraint device on a river bed surface, including a pile foundation, a rail track and a wedge-shaped rail car, the rail track is installed on the pile foundation, and the number of the wedge-shaped rail cars is determined according to the width of the river. Can walk on rail tracks. The device installs tracks on the estuary bed surface, and arranges wedge-shaped rail cars on the tracks. In actual operation, it is equivalent to a movable wedge-shaped submerged dam, which plays a role in suppressing salt tides. The device needs to lay steel rails on the riverbed and manufacture a wedge-shaped rail car, and the construction cost is relatively high. And when it is used for a long time, the rails will be buried due to sediment deposition in the river bed, and the sediment needs to be cleaned up in time, and the maintenance cost is also high.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned defects of high construction and maintenance costs in the prior art, the present invention provides a flexible current limiting salt blocking device and a salt blocking method, which have the advantages of convenient disassembly and low cost.

For solving the above-mentioned technical problems, the technical scheme of the present invention is as follows:

A first aspect of the present invention provides a flexible current-limiting and salt-blocking device, comprising a plurality of first pile foundations arranged on a river bed of a first section of a river channel, a plurality of second pile foundations arranged on a river bed of a second section of the river channel, a plurality of buoys, a plurality of A cable, a blocking net, a first water blocking cloth and a second water blocking cloth, the second section is located upstream of the first section, a number of buoys float on the water surface and are connected in series by ropes, one end of the rope is connected to the first pile foundation connection, the other end is connected with the buoy; the upper edge of the blocking net is connected with the buoy, and the lower edge of the blocking net is connected with the second pile foundation; the upper edge of the first water blocking cloth is connected with the buoy, the first water blocking cloth is connected with the buoy. The lower edge of the second water blocking cloth is connected to the second pile foundation, the upper edge of the second water blocking cloth is connected with a floating pipe, and the height of the blocking net is greater than that of the first water blocking cloth and the second water blocking cloth. The sum of the heights of the water blocking cloth.

Further, the first pile foundations are arranged at equal intervals, and the distance between adjacent first pile foundations is 3 to 8 meters.

Further, the second pile foundations are arranged at equal intervals, and the distance between adjacent second pile foundations is 3 to 8 meters.

Further, the length of the channel between the first pile foundation and the second pile foundation is 5-30m.

Further, the buoy is a hollow cylindrical structure, and the buoy is provided with a rope hole for the rope to pass through.

Further, both ends of the rope are fixed on both banks of the river.

Further, the length of the cable is 8-40m.

Further, the blocking net is a nylon rope net or a steel wire net, and its aperture is 0.5m-1m.

Further, the first water blocking cloth and the second water blocking cloth are made of flexible water-impermeable materials.

Further, the height of the blocking net is 0.5-2m greater than the sum of the heights of the first water blocking cloth and the second water blocking cloth.

A second aspect of the present invention provides a salt blocking method for the flexible current limiting salt blocking device, comprising:

At high tide, under the action of water flow, the buoy moves upstream until the cable between the first pile foundation and the buoy in the downstream is taut, and the buoy stops moving; On the blocking net, a river blocking section is formed, which reduces the water passing section; because the height of the blocking net is greater than the sum of the heights of the first water blocking cloth and the second water blocking cloth, the There is a gap that can pass through the water to reduce the force on the cable;

When the tide ebbs, the first water blocking cloth and the second water blocking cloth leave the blocking net under the action of the tide, and the ebb current flows down normally.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows: the present invention discloses a flexible current limiting salt blocking device and a salt blocking method, wherein the salt blocking device comprises a plurality of first pile foundations arranged on the river bed of the first section of the river channel , A number of second pile foundations, a number of buoys, a number of cables, a blocking net, a first water blocking cloth and a second water blocking cloth are arranged on the riverbed of the second section of the river channel, the second section is located upstream of the first section, and several The buoy floats on the water surface and is connected in series by ropes, one end of the rope is connected with the first pile foundation, and the other end is connected with the buoy; the upper edge of the arresting net is connected with the buoy, and the lower edge of the arresting net is connected with the second pile foundation The upper edge of the first water blocking cloth is connected with the buoy, and the lower edge of the first water blocking cloth is suspended; the lower edge of the second water blocking cloth is connected with the second pile foundation, and the upper edge of the second water blocking cloth A floating pipe is connected, and the height of the blocking net is greater than the sum of the heights of the first water blocking cloth and the second water blocking cloth. At high tide, under the action of water flow, the buoy moves upstream until the cable between the first pile foundation and the buoy in the downstream is taut, and the buoy stops moving; On the blocking net, a river blocking section is formed, which reduces the water passing section; because the height of the blocking net is greater than the sum of the heights of the first water blocking cloth and the second water blocking cloth, the There is a gap that can pass through the water to reduce the force on the cable; when the tide is low, the first water blocking cloth and the second water blocking cloth leave the blocking net under the action of the tidal current, and the ebb current flows down normally. The invention has flexibility and economy, and can be installed and disassembled in a short period of time, and when the salt tide is serious, the river channel is blocked, the rising tide is restricted, and the safety of water supply is guaranteed. When the salt tide weakens, it can also be dismantled and restored to navigation, which has great social and economic value.

Description of drawings

FIG. 1 is a front view of the flexible current-limiting and salt-blocking devices of Embodiment 1 and Embodiment 2. FIG.

FIG. 2 is a left side view of the flexible current-limiting and salt-blocking devices of Embodiments 1 and 2 during high tide.

FIG. 3 is a schematic diagram of FIG. 2 with reference numerals removed.

FIG. 4 is a left side view of the flexible current-limiting and salt-blocking devices of Embodiment 1 and Embodiment 2 at low tide.

FIG. 5 is a schematic diagram of FIG. 4 with reference numerals removed.

Among them: 1. River bed; 2. The first pile foundation; 3. The second pile foundation; 4. The buoy; 5. The water surface; Water cloth; 10. Rope; 11. Floating pipe.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Example 1

As shown in Figures 1-5, the present embodiment discloses a flexible current-limiting and salt-blocking device, including a plurality of first pile foundations 2 arranged on the river bed 1 of the first section of the river channel, and a plurality of first pile foundations 2 arranged on the river bed 1 of the second section of the river channel. The second pile foundation 3, a number of buoys 4, a number of cables 6, a blocking net 7, a first water blocking cloth 8 and a second water blocking cloth 9, the second section is located upstream of the first section, and a number of buoys 4 float on the water surface 5 and connected in series by ropes 10, one end of the cable 6 is connected with the first pile foundation 2, and the other end is connected with the buoy 4; the upper edge of the arresting net 7 is connected with the buoy 4, and the lower edge of the arresting net 7 is connected with the first The two pile foundations 3 are connected; the upper edge of the first water blocking cloth 8 is connected to the buoy 4 , and the lower edge of the first water blocking cloth 8 is suspended; the lower edge of the second water blocking cloth 9 is connected to the second pile foundation 3 The upper edge of the second water blocking cloth 9 is connected with a floating pipe 11 , and the height of the blocking net 7 is greater than the sum of the heights of the first water blocking cloth 8 and the second water blocking cloth 9 .

In a specific implementation process, the first pile foundations 2 are arranged at equal intervals, and the distance between adjacent first pile foundations 2 is 3 to 8 meters.

In the specific implementation process, the second pile foundations 3 are arranged at equal intervals, and the distance between adjacent second pile foundations 3 is 3 to 8 meters.

In the specific implementation process, the length of the channel between the first pile foundation 2 and the second pile foundation 3 is 5-30m.

In the specific implementation process, the buoy 4 is a hollow cylindrical structure, and the buoy 4 is provided with a rope hole for the rope 10 to pass through.

In the specific implementation process, the two ends of the rope 10 are fixed on both sides of the river, and the rope 10 is in a non-tight state, with redundancy so that the buoy can move upstream with high tide, or move downstream with low tide.

In a specific implementation process, the length of the cable 6 is 8-40 m.

In the specific implementation process, the blocking net 7 is a nylon rope net or a steel wire net, and its aperture is 0.5m-1m.

In the specific implementation process, the first water-blocking cloth 8 and the second water-blocking cloth 9 are made of flexible water-impermeable materials, such as PVC canvas and geomembrane.

In a specific implementation process, the height of the blocking net 7 is 0.5-2 m greater than the sum of the heights of the first water blocking cloth 8 and the second water blocking cloth 9 .

This embodiment provides a flexible current-limiting and salt-resisting device. During high tide, under the action of water flow, the buoy 4 moves upstream until the cable 6 between the downstream first pile foundation 2 and the buoy 4 is taut, and the buoy 4 stops moving; Under the action of the water flow, the first water blocking cloth 8 and the second water blocking cloth 9 are attached to the blocking net 7 to form a river blocking section, so that the water passing section is reduced; because the height of the blocking net 7 is greater than that of the first water blocking cloth 8 and the height of the second water blocking cloth 9, so there is a gap that can pass water between the first water blocking cloth 8 and the second water blocking cloth 9, so as to reduce the force on the cable 6; when the tide is low, the first resistance The water cloth 8 and the second water blocking cloth 9 leave the blocking net 7 under the action of the tidal current, and the ebbing current discharges normally. The invention has flexibility and economy, and can be installed and disassembled in a short period of time, and when the salt tide is serious, the river channel is blocked, the rising tide is restricted, and the safety of water supply is guaranteed. When the salt tide weakens, it can also be dismantled and restored to navigation, which has great social and economic value.

Example 2

In this embodiment, a flexible current-limiting and salt-retaining device is designed based on the model of the south tributary of the Dongjiang River in Dongguan City. Several second pile foundations 3, several cylindrical buoys 4 with a diameter of 0.8 m, several cables 6, arresting nets 7, first water blocking cloth 8 and second water blocking cloth 9 on the riverbed 1, the first pile foundation 2 and the second pile foundation 3 are arranged at equal intervals, and the distance between adjacent pile foundations is 5 meters. Several buoys 4 float on the water surface 5 and are connected in series by ropes 10, and both ends of the ropes 10 are fixed on both sides of the river. The length of the cable 6 is 30m, one end of the cable 6 is connected with the first pile foundation 2, and the other end is connected with the buoy 4; Connected with the buoy 4, the lower edge of the blocking net 7 is connected with the second pile foundation 3; the first water blocking cloth 8 and the second water blocking cloth 9 are made of PVC canvas, and the upper edge of the first water blocking cloth 8 is The buoy 4 is connected, and the lower edge of the first water blocking cloth 8 is suspended; the lower edge of the second water blocking cloth 9 is connected with the second pile foundation 3, and the upper edge of the second water blocking cloth 9 is connected with a rubber floating tube 11, The height of the blocking net 7 is 1 m greater than the sum of the heights of the first water blocking cloth 8 and the second water blocking cloth 9 .

In the specific implementation process, the first pile foundation 2 and the second pile foundation 3 are made of cement piles, and the upper part of the cement piles is exposed to the river bed 1 by about 0.3m, and a hanging ring is provided. The buoy 4 is also provided with a hanging ring, and the cable 6 Both ends are provided with hooks, and the cables 6 are respectively connected to the cement pile and the buoy 4 through the hooks for disassembly.

In the specific implementation process, the river bed 1 under the flexible current limiting and salt blocking device is paved with sandbags to form a sand quilt, which is used to prevent the river bed 1 from scouring.

The south tributary of the Dongjiang River is a strong mixed estuary, and there is still no mature emergency response project for saltwater blocking. The invention takes the strong mixed type of the south tributary of the East River as an example to study, and the result is used as an emergency engineering technology, which has flexibility and economy, and can be installed and disassembled in a short period of time. When the salt tide weakened, it was demolished to restore navigation. When necessary, the water supply security of 4 million people in Dongguan can be guaranteed. have great socioeconomic value.

Example 3

This embodiment provides a salt blocking method for the flexible current limiting salt blocking device described in Embodiment 1 and Embodiment 2, including:

As shown in Figure 2-3, at high tide, under the action of water flow, the buoy 4 moves upstream until the cable 6 between the downstream first pile foundation 2 and the buoy 4 is taut, and the buoy 4 stops moving; under the action of the water flow , the first water blocking cloth 8 and the second water blocking cloth 9 are attached to the blocking net 7 to form a river blocking section, so that the water passing section is reduced; because the height of the blocking net 7 is greater than that of the first blocking net 8 and the second blocking The sum of the heights of the water cloth 9, so there is a gap that can pass water between the first water blocking cloth 8 and the second water blocking cloth 9, so as to reduce the force on the cable 6;

As shown in Fig. 4-5, when the tide is low, the first water blocking cloth 8 and the second water blocking cloth 9 leave the blocking net 7 under the action of the tidal current, and the low current flows down normally.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. The flexible flow-limiting salty device is characterized by comprising a plurality of first pile foundations (2) arranged on a riverway first section riverbed (1), a plurality of second pile foundations (3) arranged on the riverway second section riverbed (1), a plurality of buoys (4), a plurality of mooring ropes (6), a blocking net (7), a first water-blocking cloth (8) and a second water-blocking cloth (9), wherein the second section is positioned at the upstream of the first section, the plurality of buoys (4) float on the water surface (5) and are connected in series through ropes (10), one end of each mooring rope (6) is connected with the first pile foundations (2), and the other end of each mooring rope is connected with the corresponding buoy (4); the upper edge of the blocking net (7) is connected with the buoy (4), and the lower edge of the blocking net (7) is connected with the second pile foundation (3); the upper edge of the first water-blocking cloth (8) is connected with the buoy (4), and the lower edge of the first water-blocking cloth (8) is suspended; the lower edge of the second water-blocking cloth (9) is connected with the second pile foundation (3), the upper edge of the second water-blocking cloth (9) is connected with a floating pipe (10), and the height of the blocking net (7) is larger than the sum of the heights of the first water-blocking cloth (8) and the second water-blocking cloth (9).

2. The flexible flow-limiting salty device according to claim 1, characterized in that the first pile foundations (2) are arranged at equal intervals, and the interval between adjacent first pile foundations (2) is 3-8 meters.

3. The flexible flow-limiting salty device according to claim 1, characterized in that the second pile foundations (3) are arranged at equal intervals, and the interval between adjacent second pile foundations (3) is 3-8 meters.

4. The flexible flow-limiting salty device of claim 1 characterized in that the length of the channel between the first pile foundation (2) and the second pile foundation (3) is 5-30 m.

5. The flexible flow-restricting device of claim 1, wherein the two ends of the cable (10) are fixed to the two banks of the river.

6. The flexible flow and salt confining device according to claim 1, characterized in that the length of the cable (6) is 8-40 m.

7. The flexible flow-resistant salt-resistant device according to claim 1, wherein the barrier net (7) is a nylon rope net or a steel wire net, and the aperture of the barrier net is 0.5-1 m.

8. The flexible flow-restricting salty device according to claim 1, characterized in that the first and second water-blocking cloths (8, 9) are made of a flexible water-impermeable material.

9. The flexible fluid-resistant salt-resistant device according to claim 1, wherein the height of the barrier net (7) is 0.5-2 m greater than the sum of the heights of the first and second water-blocking cloths (8, 9).

10. A method for occluding a flexible flow-restricting occluding device as defined in any one of claims 1 to 9, comprising:

in tide rising, under the action of water flow, the floating drum (4) moves upstream until a cable (6) between the downstream first pile foundation (2) and the floating drum (4) is tightened, and the floating drum (4) stops moving; under the action of water flow, the first water-blocking cloth (8) and the second water-blocking cloth (9) are attached to the blocking net (7) to form a river-blocking section, so that the water-passing section is reduced; because the height of the blocking net (7) is greater than the sum of the heights of the first water-blocking cloth (8) and the second water-blocking cloth (9), a gap capable of passing water exists between the first water-blocking cloth (8) and the second water-blocking cloth (9) so as to reduce the stress of the mooring rope (6);

when the tide falls, the first water-blocking cloth (8) and the second water-blocking cloth (9) leave the blocking net (7) under the action of the tide, and the falling tide drains normally.

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