CN113718707B - Dam and method for preventing large drift from impacting dam - Google Patents
Dam and method for preventing large drift from impacting dam Download PDFInfo
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- CN113718707B CN113718707B CN202111114891.XA CN202111114891A CN113718707B CN 113718707 B CN113718707 B CN 113718707B CN 202111114891 A CN202111114891 A CN 202111114891A CN 113718707 B CN113718707 B CN 113718707B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003116 impacting effect Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000013459 approach Methods 0.000 claims abstract description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
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- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/06—Moles; Piers; Quays; Quay walls; Groynes; Breakwaters ; Wave dissipating walls; Quay equipment
- E02B3/066—Quays
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/041—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours using active mechanical means, e.g. fluidizing or pumping
Abstract
The invention relates to a dam which comprises a dam body, wherein the dam body is provided with a plurality of outflow channels at intervals along the length of the dam body, and each outflow channel is provided with a drainage valve. The method for preventing the drift objects from impacting the dam comprises the steps of measuring the speed of the large drift objects and the distance between the large drift objects and the dam when the large drift objects are out of control and drift along with water flowing to the dam; determining a stopping point of the large drift object; adjusting the position of the large drifter according to the deviation condition of the position of the large drifter and the stop point, so that the large drifter drifts to the stop point; after the position of the large drift is adjusted, water can be dispersed to two sides so as to reduce the flow velocity of the middle water flow and further reduce the moving speed of the large drift; when the driftage object approaches to the dam, the peripheral flow passage of the stopping point area is closed, the speed of the driftage object is further reduced, and the driftage object is stopped slowly; after the driftage stops, the driftage is dragged away by using a common ship. The effect that large drifter slowly gets close to the expected destination is achieved.
Description
Technical Field
The invention relates to the technical field of dam protection, in particular to a dam and a method for preventing a large drift object from impacting the dam.
Background
After the hydropower station is built, the river channel is highly channeled, the navigation condition is greatly improved, the water transport development is promoted, and the risk that the hydropower station dam is impacted due to the out-of-control ship is increased along with the increase of the shipping ships.
In recent years, a large number of ships are disorderly and jointly berthed on the river bank, the ships are mostly abandoned corpse ships, the ships are not watched and maintained by people for a long time, metal structures are rusted seriously, and anchoring measures are extremely fragile and some ships even are in a semi-submerged state; the structural body and the anchor body of the fish cage are not specially designed in strength, are extremely fragile, are distributed in a connecting piece mode, and are large in area; the water farmhouse facility built beside the river has wide area and large volume, but the anchoring measures are not specially designed, so the water farmhouse facility is extremely fragile, is not maintained for many years, and has serious corrosion to the metal structure. Once large drifted objects such as waste corpse ships, fish culture net cages, water farmhouse recreation facilities and the like drift to dams and plants out of control, damages to gates, gate piers, trash racks, unit water inlet facilities and the like of overflow dams can be caused, so that the large drifted objects cannot normally run, and serious accidents such as dam damage, flood, reservoir emptying, unit damage and the like are caused.
Thus, the dam needs to be effectively protected to eliminate the threat of potential dam collapse.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a dike and a method for preventing a large drift object from impacting a dike, which are suitable for safety protection when threatened by impact of the large drift object.
In order to achieve the purpose, the invention adopts the following technical scheme:
dam and dyke
The invention provides a dam which comprises a dam body, wherein the dam body is provided with a plurality of outflow channels at intervals along the length of the dam body, and each outflow channel is provided with a drain valve.
As a further improvement of the above technical solution:
the outflow channels are 13, and the 13 outflow channels are uniformly distributed on the transverse cross section of the river channel. The water flow of 13 outflow channels of the dam is controlled by using the drain valve, the redistribution of the water flow direction and the readjustment of the flow speed of the water flow in the area close to the dam are realized, and the effects of directionally navigating the running track of the large drift object and slowly approaching the expected destination are achieved.
Furthermore, a reinforced structure is laid on the surface of the dam body and comprises a reinforced concrete layer, a plurality of fixing piles arranged on the reinforced concrete layer and an impact plate fixedly connected to each fixing pile, and tires are wrapped outside the impact plates. The reinforcement structure improves the impact resistance of the dike.
Furthermore, a plurality of connecting plates are arranged at positions, relative to the fixing piles, of the reinforced concrete layer, one side of each connecting plate is in threaded connection with the reinforced concrete layer, a mounting hole is formed in the other side of each connecting plate, one end of each fixing pile is inserted into the corresponding mounting hole and sleeved with a spring, the other end of each fixing pile is exposed out of the corresponding mounting hole under the elastic action of the spring, and the exposed end is connected with an impact plate. The spring provides the buffering for the impact plate, has not only improved the impacted ability of dykes and dams, has improved the life of dykes and dams moreover.
Furthermore, a stop block is arranged at one end, far away from the impact plate, of the fixing pile, a snap ring protrudes from the hole wall of the mounting hole, and the snap ring is blocked between the stop block and the impact plate. The impact plate is prevented from separating from the fixing pile.
Method
A method of preventing drifts from impacting an embankment, comprising: providing a dike according to any one of claims 1 to 5;
1) When the large drift objects are out of control and drift towards the dam along with water, measuring the speed of the large drift objects and the distance between the large drift objects and the dam;
2) Dividing 13 outflow channels of the dam into a left direction, a right direction and a middle direction, and determining the stop points of the large drift objects;
adjusting the position of the large drifter according to the deviation condition of the position of the large drifter and the stop point, so that the large drifter drifts to the stop point; if the flow rate deviates to the left, the flow rate of the outflow channel at the right position is increased, and the flow rate of the outflow channel at the left position and the outflow channel at the middle position is reduced or closed; if the direction is deviated to the right, the overflow of the left outflow channel is increased, and the overflow of the right and middle outflow channels is reduced or closed;
3) After the position of the large drift object is adjusted, the overflow of the right outflow channel and the left outflow channel is increased, the outflow channel in the middle position is reduced or closed, and water can be dispersed to two sides to reduce the flow velocity of the middle water flow so as to reduce the moving speed of the large drift object;
4) When the driftage object approaches to the dam, the peripheral flow passage of the stopping point area is closed, the speed of the driftage object is further reduced, and the driftage object is stopped slowly;
5) After the driftage stops, the driftage is dragged away by using a common ship.
Furthermore, in the step 2, if the longer side of the large drifter is consistent with the water flow direction, the large drifter is rotated clockwise until the shorter side of the large drifter is consistent with the water flow direction or the large drifter is rotated counterclockwise until the shorter side of the large drifter is consistent with the water flow direction. The area of the impact stop point is minimized, and the service life of the dam is prolonged.
Furthermore, when the large drift object rotates clockwise; and reducing or closing the overflow of the outflow channel at the middle position and the outflow channel at the left position, and unidirectionally increasing the overflow of the outflow channel at the right position.
Furthermore, when the large drift object rotates anticlockwise; and reducing or closing the overflow of the outflow channel at the middle position and the outflow channel at the right position, and unidirectionally increasing the overflow of the outflow channel at the left position.
Furthermore, in step 2, if the water level of the reservoir is low and the capacity of the emergency regulation reservoir is large, the overflow of the right outflow channel, the overflow of the left outflow channel and the outflow channels in the middle position can be all closed, and water backflow is formed in the dam-near area to generate a braking effect on the drift.
Compared with the prior art, the invention has the advantages that:
1. once the drifter is close to the dam, the water flow of the 13 outflow channels of the dam is controlled by using the drain valve, the redistribution and the readjustment of the flow direction of the water flow in the dam-close area are realized, and the effects of directionally navigating the running track of the large drifter and slowly approaching the expected destination are achieved. The mode only utilizes the existing personnel and equipment of the hydropower station to carry out emergency adjustment on the outflow mode, thereby not only being safe, simple, convenient, flexible and efficient, but also not needing to additionally increase the cost.
2. Dykes and dams body is provided with a plurality of passageways of effluenting along its length interval, all is equipped with the drain valve on every passageway of effluenting, and the operating personnel of being convenient for utilizes the water outlet that the drain valve started a plurality of different angles simultaneously, prevents effectively that the drift from assaulting dykes and dams.
3. The flow rate of each outflow channel is controlled by the drainage valve, so that the operation is convenient.
Drawings
Fig. 1 is a structural view of a dam.
Fig. 2 is a structural view of the reinforcing structure.
Fig. 3 is a cross-sectional view of a reinforcing structure.
Fig. 4 is a flow field and velocity profile of the near dam region of a large hydropower station.
Fig. 5 is a diagram of the travel locus of the float in the normal operation mode.
Fig. 6 is a diagram of a trajectory of a float under a method of preventing drift from impacting a dam.
Description of reference numerals:
1. a dam body; 2. reinforcing the structure; 3. a connecting plate; 21. a reinforced concrete layer; 22. an impact plate; 23. fixing the pile; 24. mounting holes; 25. a stopper; 26. a spring; 27. a snap ring.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, there will now be described in detail, with reference to the accompanying drawings, a non-limiting detailed description of the present invention.
As shown in fig. 1 to 3, the embankment of this embodiment includes an embankment body 1, the embankment body 1 is provided with a plurality of outflow channels at intervals along the length thereof, and each outflow channel is provided with a drainage valve. Outflow channel is 13, and 13 outflow channels evenly distributed is in river course transverse cross section.
Wherein, 1 surface of dykes and dams body has laid reinforced structure 2, and reinforced structure 2 includes reinforced concrete layer 21, sets up fixedly connected with impingement plate 22 on a plurality of spud piles 23 on reinforced concrete layer 21 and every spud pile 23, and the outer parcel of impingement plate 22 has the tire. The position of reinforced concrete layer 21 relative spud pile 23 is equipped with a plurality of connecting plates 3, and 3 one side of connecting plate and 21 threaded connection of reinforced concrete layer, the opposite side are equipped with mounting hole 24, and 23 one ends of spud pile are inserted in mounting hole 24 and the cover has spring 26, and the other end of spud pile 23 exposes the mounting hole 24 outside under the spring action of spring 26, should expose the end and be connected with impingement plate 22. A stop block 25 is arranged at one end, far away from the impact plate 22, of the fixing pile 23, a snap ring 27 protrudes from the hole wall of the mounting hole 24, and the snap ring 27 is blocked between the stop block 25 and the impact plate 22.
The concrete steps of utilizing the dam to prevent drift objects from impacting the dam are as follows:
1) And when the large drift objects are out of control and drift to the dam along with water, measuring the speed of the large drift objects and the distance between the large drift objects and the dam.
2) Dividing 13 outflow channels of the dam into a left direction, a right direction and a middle direction, and determining the stop points of the large drift objects; adjusting the position of the large drifter according to the deviation condition of the position of the large drifter and the stop point, so that the large drifter drifts to the stop point; if the flow rate deviates to the left, the flow rate of the outflow channel at the right position is increased, and the flow rate of the outflow channel at the left position and the outflow channel at the middle position is reduced or closed; if the direction of the flow is deviated to the right, the overflow of the left outflow channel is increased, and the overflow of the right and middle outflow channels is reduced or closed. If the longer side of the large drift object is consistent with the water flow direction, the large drift object is rotated clockwise until the shorter side of the large drift object is consistent with the water flow direction or the large drift object is rotated anticlockwise until the shorter side of the large drift object is consistent with the water flow direction. When the large drift object rotates clockwise; and reducing or closing the overflow of the outflow channel at the middle position and the outflow channel at the left position, and unidirectionally increasing the overflow of the outflow channel at the right position. When the large drift object rotates anticlockwise; and reducing or closing the overflow of the outflow channels at the middle position and the outflow channel at the right position, and unidirectionally increasing the overflow of the outflow channel at the left position. If the water level of the reservoir is low and the capacity of the emergency adjusting reservoir is large, the overflow of the right outflow channel, the overflow of the left outflow channel and the outflow channels of the middle position can be completely closed, and water backflow is formed in the area close to the dam so as to generate a braking effect on drifted objects.
3) After the position of the large drift object is adjusted, the overflowing amount of the right outflow channel and the left outflow channel is increased, the outflow channel in the middle position is reduced or closed, and water can be dispersed to two sides to reduce the flow velocity of the middle water flow and further reduce the moving speed of the large drift object.
4) When the driftage object is close to the dam, the peripheral flow passage of the stopping point area is closed, the speed of the driftage object is further reduced, and the driftage object is stopped slowly.
5) After the driftage stops, the driftage is dragged away by using a common ship.
13 outflow passages of the overflow dam of the large chemical hydropower station are divided into a left direction, a right direction and a middle direction, the outflow passage is 9-13 on the left side of the river channel, the outflow passage is 1-4 on the right side of the river channel, and the outflow passage is 5-8 in the middle of the river channel. The warehousing flow of the large hydropower station is 5000m 3 And/s, the water level in front of the dam is 154.2m, the No. 4-7 outflow channels are all fixed hoist control gates, each opening of the No. 4-7 outflow channels is 3.5m when the gates are opened to discharge flood, and the overflow of a single outflow channel is 550m 3 2200m in total for the outflow channel of No. 9-12/s 3 And s. Assuming that the large drifter is found when the large drifter is located on the right bank of the riverway at 1.2kM in front of the dam, the operation unit deduces the operation track of the large drifter as follows according to two modes of normal operation and flow field control operation.
And (5) a normal operation mode.
In a normal operation mode, the flow field and the flow velocity distribution of the dam-near area of the large hydropower station are shown in fig. 4, the large drift loses the kinetic energy of the large drift, the flow state and the flow velocity of the area where the large drift is located determine the operation track and the operation speed of the large drift, the operation track is shown in fig. 5, and finally, the ship directly impacts the gate and the gate pier of the dam or the overflow dam at the speed synchronous with the flow velocity of the water, namely the flow velocity is about 2.0m/s, and stops in the area in front of the dam. The impact of large drifter at the flow speed of about 2.0m/s can cause the gate and the gate pier of the overflow dam to be damaged by impact or directly clamped in the gate hole, so that the normal operation of the flood discharge gate can not be caused to cause flood control accidents.
The method for preventing drift objects from impacting the dam. As depicted in fig. 6, the regulation step:
1) Once large drifts are found, the gate operators are informed to build in position immediately, after the building is in position, the ship is pulled close to the dam from 1200m to about 1000m, and the speed of the drifts is about 0.8m/s.
2) And determining the stop point of the large drift object. And adjusting the position of the large drift object according to the deviation condition of the position of the large drift object and the stop point, so that the large drift object drifts to the stop point. Increase the outflow capacity of the outflow channel on the left side, i.e. open No. 13 outflowChannel, opening 7m. The outflow capacity of the outflow channel on the right side is reduced, namely the No. 4 outflow channel is closed, the control time of the node is that the distance between the ship and the dam is about 800m, after the regulation, the left direction, the middle direction and the right direction are basically equalized, and the outflow capacity is increased by about 500m 3 The water level slowly drops. The flow field potential changes at this time are: the left outflow channel is strengthened, the right outflow channel is weakened, and the middle outflow channel is weakened.
3) The outflow capacity of the outflow channel on the left side is continuously increased, namely the No. 8 outflow channel and the No. 9 outflow channel are opened, the opening is 5m, and after the adjustment, the outflow capacity is increased by about 500m 3 And/s, the water level continues to slowly fall, the flow state potential energy inclines to the left side, and the running direction of the large drift objects is adjusted to the left side. The flow field potential changes at this time are: the left side continues to strengthen and the right and middle continue to weaken.
4) The outflow capacity of the outflow channel on the left side is increased, namely the No. 12 outflow channel is opened, the opening is 7m, and the node completion control time is about 400 m from the ship to the dam. At this time, the discharge capacity was increased by about 500m 3 And/s, the water level continues to slowly fall, the flow state potential energy inclines to the left side, and the running direction of the large drift objects continues to be adjusted to the left side until the drift objects are basically in the middle position of the river channel, but the running direction is inclined to the left side. The flow field potential changes at this time are: the left side continues to strengthen and the right and middle continue to weaken.
5) The outflow capacity of the outflow channel on the right side is increased, namely, the No. 1 outflow channel is opened, the opening is 3.5m, and the No. 6 outflow channel and the No. 7 outflow channel are closed simultaneously. At this time, the discharge capacity was reduced by about 500m 3 The flow field potential change is: the left and right sides continue to strengthen and the middle accelerates less.
6) And (4) continuously increasing the outflow capacity of the outflow channel on the right side, namely increasing the opening of the No. 1 outflow channel to 7m, and simultaneously closing the No. 5 outflow channel and the No. 8 outflow channel. At this time, the discharge capacity was reduced by about 500m 3 The flow field potential change is: the left and right sides continue to strengthen, and the middle accelerates and weakens.
7) The No. 4 outflow channel and the No. 9 outflow channel are closed. At this time, the discharge capacity was reduced by about 1000m 3 The flow field potential change is: left and right sidesThe acceleration continues to be stronger and the intermediate acceleration is weaker.
8) The No. 1 outflow channel and the No. 12 outflow channel are closed. At this time, the intermediate flow field is almost in a static state, and all potential energy is almost in a cross-flow state. Under the pulling of the water flow energy at the left side and the right side and the action of middle still water resistance, the drift object further slows down the running speed until slowly stopping in the middle area of the dam.
The hydropower station based on flow field control prevents large drifts from impacting the dam mode, emergency rescue personnel and equipment are in zero contact with the large drifts out of control, conventional operation is carried out on the existing equipment and facilities for many times only by site operation personnel of the hydropower station, additional equipment, personnel and cost are not needed, technical transformation and personnel retraining are not needed, the safety is higher, the operability and flexibility are stronger, the emergency treatment effect is good, any harmful emission is avoided, the configuration cost expenditure of emergency rescue ships of the hydropower station can be effectively avoided, the hydropower station is more environment-friendly and economical, the hydropower station is suitable for almost all hydropower stations and junction water conservancy in the whole country, and once the hydropower station is comprehensively popularized, the economic benefit and the social benefit are extremely considerable. With the enhancement of environmental protection, the change of the living habits of residents in the reservoir area and the acceleration of the tourism development of the reservoir area, the risk that a large drift object formed by a large bamboo stump, trees, water tourism facilities and the like impacts the dam is further increased, and the application value of a flow field control mode is bound to be further reflected.
Claims (5)
1. A method for preventing drifted material from impacting an embankment, comprising
1) Arranging a dam, wherein the dam comprises a dam body (1), the dam body (1) is provided with a plurality of outflow channels at intervals along the length of the dam body, and each outflow channel is provided with a drain valve; 13 outflow channels are uniformly distributed on the transverse cross section of the river channel; the surface of the dam body (1) is paved with a reinforced structure (2), the reinforced structure (2) comprises a reinforced concrete layer (21), a plurality of fixing piles (23) arranged on the reinforced concrete layer (21) and an impact plate (22) fixedly connected to each fixing pile (23), and tires are wrapped outside the impact plates (22); a plurality of connecting plates (3) are arranged at positions, opposite to the fixing piles (23), of the reinforced concrete layer (21), one sides of the connecting plates (3) are in threaded connection with the reinforced concrete layer (21), mounting holes (24) are formed in the other sides of the connecting plates, one ends of the fixing piles (23) are inserted into the mounting holes (24) and sleeved with springs (26), the other ends of the fixing piles (23) are exposed out of the mounting holes (24) under the elastic force action of the springs (26), and the exposed ends are connected with impact plates (22); a stop block (25) is arranged at one end of the fixed pile (23) far away from the impact plate (22), a snap ring (27) protrudes from the wall of the mounting hole (24), and the snap ring (27) is blocked between the stop block (25) and the impact plate (22);
2) When the large drift objects are out of control and drift towards the dam along with water, measuring the speed of the large drift objects and the distance between the large drift objects and the dam;
3) Dividing 13 outflow channels of the dam into a left direction, a right direction and a middle direction, and determining the stop points of the large drift objects;
adjusting the position of the large drifter according to the deviation condition of the position of the large drifter and the stop point, so that the large drifter drifts to the stop point; if the flow rate deviates to the left, the flow rate of the outflow channel at the right position is increased, and the flow rate of the outflow channel at the left position and the outflow channel at the middle position is reduced or closed; if the direction is deviated to the right, the overflow of the left outflow channel is increased, and the overflow of the right and middle outflow channels is reduced or closed;
4) After the position of the large drift object is adjusted, the overflow of the right outflow channel and the left outflow channel is increased, the outflow channel in the middle position is reduced or closed, and water can be dispersed to two sides to reduce the flow velocity of the middle water flow so as to reduce the moving speed of the large drift object;
5) When the driftage object approaches to the dam, the peripheral flow passage of the stopping point area is closed, the speed of the driftage object is further reduced, and the driftage object is stopped slowly;
6) After the driftage stops, the driftage is dragged away by using a common ship.
2. The method for preventing driftage from hitting a dike according to claim 1, wherein: in the step 2, if the longer side of the large drifter is consistent with the water flow direction, the large drifter is rotated clockwise until the shorter side of the large drifter is consistent with the water flow direction or the large drifter is rotated anticlockwise until the shorter side of the large drifter is consistent with the water flow direction.
3. A method for preventing drifts from hitting an embankment according to claim 2, wherein: when the large drift object rotates clockwise; and reducing or closing the overflow of the outflow channel at the middle position and the outflow channel at the left position, and unidirectionally increasing the overflow of the outflow channel at the right position.
4. A method for preventing drifts from hitting an embankment according to claim 3, wherein: when the large drift object rotates anticlockwise; and reducing or closing the overflow of the middle position outflow channel and the right position outflow channel, and unidirectionally increasing the overflow of the left position outflow channel.
5. The method for preventing driftage from hitting a dike according to claim 4, wherein: in the step 2, if the water level of the reservoir is low and the capacity of the emergency adjustment reservoir is large, the overflow of the right outflow channel, the overflow of the left outflow channel and the outflow channels in the middle position can be completely closed, and water backflow is formed in the dam-near area to generate a braking effect on the drift.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111114891.XA CN113718707B (en) | 2021-09-23 | 2021-09-23 | Dam and method for preventing large drift from impacting dam |
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| CN202111114891.XA CN113718707B (en) | 2021-09-23 | 2021-09-23 | Dam and method for preventing large drift from impacting dam |
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| JP4602094B2 (en) * | 2005-01-13 | 2010-12-22 | 西松建設株式会社 | Sand drift control structure |
| CN1746431A (en) * | 2005-09-15 | 2006-03-15 | 上海交通大学 | Reducing and wash preventing method of artificial float |
| US9457290B2 (en) * | 2011-02-04 | 2016-10-04 | Kenneth Douglas Hill | Wave simulator for board sports |
| CN211340639U (en) * | 2019-11-04 | 2020-08-25 | 浙江海洋大学 | River channel dam reinforcing mechanical equipment |
| CN214033611U (en) * | 2020-09-18 | 2021-08-24 | 唐兵 | Water conservancy dykes and dams with scour protection purification performance |
| CN113123294A (en) * | 2021-04-19 | 2021-07-16 | 宋亚攀 | A buffering energy dissipation subassembly for water conservancy dykes and dams |
| CN113335458B (en) * | 2021-05-30 | 2022-05-13 | 中国长江三峡集团有限公司 | Midship transfer connection shunting device and method |
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