CN114718019B - Flexible flow-limiting salty blocking device and salty blocking method - Google Patents
Flexible flow-limiting salty blocking device and salty blocking method Download PDFInfo
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- CN114718019B CN114718019B CN202210243480.9A CN202210243480A CN114718019B CN 114718019 B CN114718019 B CN 114718019B CN 202210243480 A CN202210243480 A CN 202210243480A CN 114718019 B CN114718019 B CN 114718019B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/005—Deformable barrages or barrages consisting of permanently deformable elements, e.g. inflatable, with flexible walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
Abstract
The invention discloses a flexible flow resistance and salty resistance device and a salty resistance method, wherein the device comprises a plurality of first pile foundations arranged on a river bed with a first section of a river channel, a plurality of second pile foundations arranged on a river bed with a second section of the river channel, a plurality of buoys, a plurality of cables, a blocking net, first water-blocking cloth and second water-blocking cloth, when tide is rising, under the action of water flow, the buoys move upwards until the cables between the first pile foundations at the downstream and the buoys are tightened, and the buoys stop moving; under the action of water flow, the first water-blocking cloth and the second water-blocking cloth are stuck to the blocking net to form a river cross section, so that the water cross section is reduced; because the height of the blocking net is larger than the sum of the heights of the first water-blocking cloth and the second water-blocking cloth, gaps capable of being filled with water exist between the first water-blocking cloth and the second water-blocking cloth so as to reduce stress of a cable; when tide falls, the first water-blocking cloth and the second water-blocking cloth leave the blocking net under the action of tide, and the tide falls normally and leaks. The invention has flexibility and economy, and can be installed and disassembled in a short time.
Description
Technical Field
The invention relates to the technical field of estuary salty tide and salty inhibition, in particular to a flexible flow resistance salty limiting device and a salty resistance method.
Background
The salt tide is a unique natural phenomenon in a river estuary area, and the salt tide invasion refers to the phenomenon that high salt water outside the estuary is transported and mixed upwards along the estuary along with tide rising and falling, so that upstream river water body becomes salty. For example, the water supply safety is affected by factors such as bias of upstream water in winter, rising of sea level, undercut of river channels and the like in the river mouth region of the pearl river, so that the water intake of an upstream water plant of the river channel is subjected to ultra-standard salt water, and the water plant cannot obtain fresh water, thereby affecting the water supply safety.
In order to prevent or reduce disasters caused by salt tide invasion, the salinity of the water meter in the estuary area is inverted through a satellite remote sensing technology at present, and salt tide is predicted by combining the salinity condition of the water sample in the hydrologic station. And (5) taking corresponding measures according to the salt tide prediction to carry out salt tide inhibition. The technology of 'up-filling' salty tide prevention and control for regulating water pressure and salty in the diaphysis reservoir of the Zhujiang river basin is basically mature, meanwhile, the 'middle storage' of the delta raw water taking, conveying and supplying system also plays the role gradually, but no effective salty tide countermeasure is available for continuous or special withered water years. The river mouth salty-blocking technology is developed, and an 'upper compensation-middle storage-lower resistance' pearl river mouth salty tide comprehensive prevention and control system is constructed, so that the method has great significance for water supply safety guarantee.
As early as 1988 and 1999, a submerged dam is applied to Mischhibi river in the United states as a down-shift salty-suppressing engineering measure, the submerged dam is built by silt in a river bed before coming in a dead season, the submerged dam is flushed away by flood in a flood season after salty-suppressing effect is completed, and practice proves that the submerged dam can effectively prevent the invasion of a brine wedge, so that the upward tracing of salty tides is suppressed. However, the submerged dam has huge engineering quantity and can not be reused, and is effective only for weak mixed river mouths, and has little effect on strong mixed river mouths.
Patent CN108914875a discloses an underwater water curtain method for estuary salt tide prevention and control, which reduces the salinity of a river channel by sucking upper fresh water and spraying the fresh water at the bottom, lifting and promoting the stirring of salt water clusters at the bottom, and destroying a salt water wedge structure; meanwhile, the water spraying amount is automatically adjusted according to the local forecast of the salinity, the water spraying amount is reduced when the salinity is low, and the water spraying amount is increased when the salinity is high, so that the salt water clusters are fully contacted with the fresh water, the salinity of the river channel is reduced, and a basis is provided for water taking in estuary areas. The technology needs to use a plurality of high-power water pumps to pump water, and needs to build a river mouth platform, so that the construction cost is high. And when in use, the high-power water pump can generate more electric energy consumption, and the use cost is higher.
Patent CN 107059762a discloses a device for tracing and inhibiting a river bed surface saline water wedge, which comprises a pile foundation, a steel rail track and wedge-shaped railcars, wherein the steel rail track is arranged on the pile foundation, the number of the wedge-shaped railcars is determined according to river width, and the wedge-shaped railcars can walk on the steel rail track. The device is provided with the track on the bed surface of the estuary river, and the wedge-shaped railcar is arranged on the track, which is equivalent to a movable wedge-shaped submerged dam in actual operation, thereby playing a role in inhibiting salt tide. The device needs to lay steel rails on a river bed and manufacture wedge-shaped rail cars, and has high construction cost. And when the device is used for a long time, the steel rail can be buried due to sediment accumulation of the riverbed, so that the sediment needs to be cleaned in time, and the maintenance cost is high.
Disclosure of Invention
The invention provides the flexible flow-limiting salty blocking device and the salty blocking method, which have the advantages of convenient disassembly and low cost, and the defects of high construction and maintenance cost in the prior art are overcome.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a flexible flow resistance limiting salty device, which comprises a plurality of first pile foundations arranged on a river bed with a first section of a river, a plurality of second pile foundations arranged on a river bed with a second section of the river, a plurality of buoys, a plurality of cables, a blocking net, first water blocking cloth and second water blocking cloth, wherein the second section is positioned at the upstream of the first section, the buoys float on the water surface and are connected in series by cables, one end of each cable is connected with the first pile foundations, and the other end of each cable is connected with each buoy; the upper edge of the blocking net is connected with the pontoon, 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 pontoon, and the lower edge of the first water-blocking cloth is suspended; the lower edge of the second water-blocking cloth is connected with a 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 larger than the sum of the heights of the first water-blocking cloth and the second water-blocking cloth.
Further, the first pile foundations are distributed at equal intervals, and the distance between adjacent first pile foundations is 3-8 meters.
Further, the second pile foundations are distributed at equal intervals, and the distance between adjacent second pile foundations is 3-8 meters.
Further, the river channel length between the first pile foundation and the second pile foundation is 5-30 m.
Further, the pontoon is of a hollow cylindrical structure, and a rope hole for a rope to pass through is formed in the pontoon.
Further, two ends of the rope are fixed on two sides of the river channel.
Further, the length of the cable is 8-40 m.
Further, the blocking net is a nylon rope net or a steel wire net, and the aperture of the blocking net is 0.5 m-1 m.
Further, the first water-blocking cloth and the second water-blocking cloth are made of flexible waterproof materials.
Further, the height of the blocking net is 0.5-2 m greater than the sum of the heights of the first water blocking cloth and the second water blocking cloth.
The second aspect of the invention provides a salty blocking method of the flexible flow-limiting salty blocking device, which comprises the following steps:
when tide is rising, under the action of water flow, the pontoon moves upwards until the cable between the downstream first pile foundation and the pontoon is tightened, and the pontoon stops moving; under the action of water flow, the first water-blocking cloth and the second water-blocking cloth are stuck to the blocking net to form a river cross section, so that the water cross section is reduced; because the height of the blocking net is larger than the sum of the heights of the first water-blocking cloth and the second water-blocking cloth, gaps capable of being filled with water exist between the first water-blocking cloth and the second water-blocking cloth so as to reduce stress of a cable;
when tide falls, the first water-blocking cloth and the second water-blocking cloth leave the blocking net under the action of tide, and the tide falls normally and leaks.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention discloses a flexible flow resistance and salty prevention device and a salty prevention method, wherein the salty prevention device comprises a plurality of first pile foundations arranged on a riverbed with a first section of a riverway, a plurality of second pile foundations arranged on a riverbed with a second section of the riverbed, a plurality of buoys, a plurality of cables, a blocking net, a first water-blocking cloth and a second water-blocking cloth, wherein the second section is positioned at the upstream of the first section, the buoys float on the water surface and are connected in series by ropes, one end of each cable is connected with the first pile foundations, and the other end of each cable is connected with each buoy; the upper edge of the blocking net is connected with the pontoon, 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 pontoon, and the lower edge of the first water-blocking cloth is suspended; the lower edge of the second water-blocking cloth is connected with a 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 larger than the sum of the heights of the first water-blocking cloth and the second water-blocking cloth. When tide is rising, under the action of water flow, the pontoon moves upwards until the cable between the downstream first pile foundation and the pontoon is tightened, and the pontoon stops moving; under the action of water flow, the first water-blocking cloth and the second water-blocking cloth are stuck to the blocking net to form a river cross section, so that the water cross section is reduced; because the height of the blocking net is larger than the sum of the heights of the first water-blocking cloth and the second water-blocking cloth, gaps capable of being filled with water exist between the first water-blocking cloth and the second water-blocking cloth so as to reduce stress of a cable; when tide falls, the first water-blocking cloth and the second water-blocking cloth leave the blocking net under the action of tide, and the tide falls normally and leaks. The invention has flexibility and economy, can be installed and dismantled in a short period, and can block the river channel when the salt tide is serious, limit the rising tide and ensure the water supply safety. When the salt tide is weakened, the navigation can be dismantled and restored, and the method has great social and economic values.
Drawings
Fig. 1 is a front view of the flexible flow-restricting salty devices of embodiments 1 and 2.
FIG. 2 is a left side view of the flexible flow-restricting salty devices of examples 1 and 2 at the time of tide rise.
Fig. 3 is a schematic diagram of fig. 2 with reference numerals removed.
Fig. 4 is a left side view of the flexible flow-restricting salty devices of examples 1 and 2 at the time of tide.
Fig. 5 is a schematic view of fig. 4 with reference numerals removed.
Wherein: 1. a river bed; 2. a first pile foundation; 3. a second pile foundation; 4. a pontoon; 5. a water surface; 6. a cable; 7. a blocking net; 8. a first water-blocking cloth; 9. a second water-blocking cloth; 10. a rope; 11. and (5) floating pipes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, 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. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Example 1
As shown in fig. 1-5, the embodiment discloses a flexible flow-resistance-limiting salty device, which comprises a plurality of first pile foundations 2 arranged on a river bed 1 with a first section of a river channel, a plurality of second pile foundations 3 arranged on a river bed 1 with a second section of the river channel, a plurality of buoys 4, a plurality of cables 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 buoys 4 float on the water surface 5 and are connected in series by ropes 10, one ends of the cables 6 are connected with the first pile foundations 2, and the other ends of the cables 6 are connected with the buoys 4; the upper edge of the blocking net 7 is connected with the pontoon 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 pontoon 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 11, 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.
In the concrete implementation process, the first pile foundations 2 are distributed at equal intervals, and the distance between adjacent first pile foundations 2 is 3-8 meters.
In the concrete implementation process, the second pile foundations 3 are distributed at equal intervals, and the distance between every two adjacent second pile foundations 3 is 3-8 meters.
In the concrete implementation process, the river channel length between the first pile foundation 2 and the second pile foundation 3 is 5-30 m.
In the implementation process, the pontoon 4 is of a hollow cylindrical structure, and the pontoon 4 is provided with rope holes for the ropes 10 to pass through.
In a specific implementation process, two ends of the rope 10 are fixed on two sides of a river channel, the rope 10 is in a non-straightened state, and redundancy is provided to enable the pontoon to move upstream along with rising tide or move downstream along with falling tide.
In a specific implementation, 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 the aperture of the blocking net is 0.5 m-1 m.
In a specific implementation process, the first water-blocking cloth 8 and the second water-blocking cloth 9 are made of flexible waterproof materials, such as PVC canvas and geomembrane.
In the specific implementation process, the height of the blocking net 7 is 0.5-2 m larger than the sum of the heights of the first water blocking cloth 8 and the second water blocking cloth 9.
The implementation provides a flexible flow-limiting salty device, when tide is rising, under the action of water flow, a pontoon 4 moves upwards until a cable 6 between a downstream first pile foundation 2 and the pontoon 4 is tightened, and the pontoon 4 stops moving; under the action of water flow, the first water-blocking cloth 8 and the second water-blocking cloth 9 are stuck on the blocking net 7 to form a river cross section, so that the water passing cross section is reduced; because 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, gaps capable of passing water exist between the first water-blocking cloth 8 and the second water-blocking cloth 9 so as to reduce stress of the cables 6; when tide falls, the first water-blocking cloth 8 and the second water-blocking cloth 9 leave the blocking net 7 under the action of tide, and the tide falls normally. The invention has flexibility and economy, can be installed and dismantled in a short period, and can block the river channel when the salt tide is serious, limit the rising tide and ensure the water supply safety. When the salt tide is weakened, the navigation can be dismantled and restored, and the method has great social and economic values.
Example 2
The embodiment designs a flexible flow resistance limiting salty device by taking branches of east, river and south of Dongguan city as a model, and the flexible flow resistance limiting salty device comprises a plurality of first pile foundations 2 arranged on a river bed 1 with a certain section of a river channel, a plurality of second pile foundations 3 arranged on the river bed 1 with the position 25m above the first pile foundations 2, a plurality of cylindrical pontoons 4 with the diameter of 0.8m, a plurality of cables 6, a blocking net 7, a first water blocking cloth 8 and a second water blocking cloth 9, wherein the first pile foundations 2 and the second pile foundations 3 are distributed at equal intervals, and the distance between adjacent pile foundations is 5 meters. A plurality of 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 course. The length of the mooring rope 6 is 30m, one end of the mooring rope 6 is connected with the first pile foundation 2, and the other end of the mooring rope 6 is connected with the pontoon 4; the blocking net 7 is a nylon rope net, the aperture of the nylon rope net is 0.6m, the upper edge of the blocking net 7 is connected with the pontoon 4, and 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, the upper edge of the first water-blocking cloth 8 is connected with the pontoon 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 rubber float pipe 11, and the height of the blocking net 7 is 1m greater than the sum of the heights of the first water-blocking cloth 8 and the second water-blocking cloth 9.
In the concrete implementation process, the first pile foundation 2 and the second pile foundation 3 adopt cement piles, the upper parts of the cement piles are exposed out of the river bed 1 by about 0.3m and are provided with hanging rings, the pontoons 4 are also provided with hanging rings, two ends of each mooring rope 6 are provided with hooks, and each mooring rope 6 is connected with the cement piles and the pontoons 4 through the hooks so as to be convenient to disassemble.
In the specific implementation process, the river bed 1 below the flexible flow resistance salty device is paved into a sand quilt by a sand bag, so that the river bed 1 is prevented from being washed.
The branches in the east and the south are strong mixed estuaries, no mature salty-blocking emergency engineering is available at present for reference use, and meanwhile, dongguan city indicates that the river is rather blocked, temporary navigation is sacrificed, and water supply safety is guaranteed. The invention takes strong mixed east and south tributaries as an example for research, and the achievement is used as an emergency engineering technology, has flexibility and economy, can be installed and dismantled in a short period, can block a river channel when the salty tide is serious, can limit the rising tide, and can be dismantled to restore navigation when the salty tide is weakened. The water supply safety of 400 thousands of people in Dongguan city can be ensured when necessary. Has great social and economic values.
Example 3
The present embodiment provides a method for preventing salty taste of the flexible flow-limiting salty taste device according to embodiment 1 and embodiment 2, comprising:
as shown in fig. 2-3, at the time of tide, under the action of water flow, the pontoon 4 moves upstream until the cable 6 between the downstream first pile foundation 2 and the pontoon 4 is tightened, and the pontoon 4 stops moving; under the action of water flow, the first water-blocking cloth 8 and the second water-blocking cloth 9 are stuck on the blocking net 7 to form a river cross section, so that the water passing cross section is reduced; because 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, gaps capable of passing water exist between the first water-blocking cloth 8 and the second water-blocking cloth 9 so as to reduce stress of the cables 6;
as shown in fig. 4-5, during tide, the first water-blocking cloth 8 and the second water-blocking cloth 9 leave the blocking net 7 under the action of tide, and the tide is normally let down.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. The flexible flow-limiting salty device is characterized by comprising a plurality of first pile foundations (2) arranged on a river bed with a first section of a river, a plurality of second pile foundations (3) arranged on a river bed with a second section of the river, a plurality of buoys (4), a plurality of cables (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 buoys (4) float on the water surface (5) and are connected in series by ropes (10), two ends of the ropes (10) are fixed on two sides of the river, one end of each cable (6) is connected with the first pile foundations (2), and the other end of each cable (6) is connected with each buoy (4); the upper edge of the blocking net (7) is connected with the pontoon (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 pontoon (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 (11), 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);
the first pile foundations (2) are distributed at equal intervals, and the distance between adjacent first pile foundations (2) is 3-8 meters; the second pile foundations (3) are distributed at equal intervals, and the distance between every two adjacent second pile foundations (3) is 3-8 meters; the river channel length between the first pile foundation (2) and the second pile foundation (3) is 5-30 m.
2. A flexible flow-restricting salty device according to claim 1, wherein the length of the cable (6) is 8-40 m.
3. A flexible flow resistance salty device according to claim 1, wherein the arresting net (7) is a nylon rope net or a steel wire net with a pore size of 0.5-1 m.
4. The flexible flow resistance salty device according to claim 1, wherein the first water blocking cloth (8) and the second water blocking cloth (9) are made of flexible waterproof materials.
5. A flexible flow resistance salty device according to claim 1, wherein the height of the blocking net (7) is 0.5-2 m larger than the sum of the heights of the first water blocking cloth (8) and the second water blocking cloth (9).
6. A method of resistance to salty taste of a flexible resistance and salty taste device according to any one of claims 1-5, comprising:
when tide is rising, under the action of water flow, the pontoon (4) moves upwards until a cable (6) between the downstream first pile foundation (2) and the pontoon (4) is tightened, and the pontoon (4) stops moving; under the action of water flow, the first water-blocking cloth (8) and the second water-blocking cloth (9) are stuck on 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 larger than the sum of the heights of the first water-blocking cloth (8) and the second water-blocking cloth (9), gaps capable of being used for water passing exist between the first water-blocking cloth (8) and the second water-blocking cloth (9) so as to reduce stress of the mooring ropes (6);
when tide falls, the first water-blocking cloth (8) and the second water-blocking cloth (9) leave the blocking net (7) under the action of tide, and the tide falls normally.
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| FR1386516A (en) * | 1963-12-09 | 1965-01-22 | Grenobloise Etude Appl | Device to prevent the upwelling of salt water in estuaries |
| CN1120913C (en) * | 2001-05-24 | 2003-09-10 | 梁嘉麟 | One-way damper process of regulating tide energy, dredging channel and making land with silt |
| CN1242122C (en) * | 2002-10-01 | 2006-02-15 | 中国计量学院 | One-way damper and its usage in regulating energy of tide for dredging water way and making land with silt |
| CN202787192U (en) * | 2012-09-10 | 2013-03-13 | 珠江水利委员会珠江水利科学研究院 | Movable salt-inhibition submerged dike |
| CN112900350B (en) * | 2021-01-19 | 2022-04-05 | 珠江水利委员会珠江水利科学研究院 | Latent salty-inhibiting movable flap valve structure |
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