CN117646404B - System and method for discharging ecological flow in whole process of hydraulic junction engineering - Google Patents
System and method for discharging ecological flow in whole process of hydraulic junction engineering Download PDFInfo
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- CN117646404B CN117646404B CN202410115821.3A CN202410115821A CN117646404B CN 117646404 B CN117646404 B CN 117646404B CN 202410115821 A CN202410115821 A CN 202410115821A CN 117646404 B CN117646404 B CN 117646404B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a system and a method for discharging ecological flow in the whole process of a hydraulic hub engineering, belongs to the technical field of ecological flow discharging, and can solve the problem that the continuous ecological flow discharging cannot be ensured at each stage of hydraulic engineering construction operation in the prior art, and the influence on the downstream ecological environment is caused. The system comprises: the water inlet of the diversion tunnel is positioned in the reservoir, and a plugging device is arranged on the water inlet of the diversion tunnel; the water passing channel is arranged on the plugging device in a penetrating way and is used for discharging ecological flow to a downstream river channel of the dam when the water level of the reservoir is lower than a first preset water level; the water passing valve is arranged at the water inlet of the water passing channel and used for adjusting the opening of the water passing channel; and the water inlet of the drainage pipeline is communicated with the water supply pipeline, and the water outlet of the drainage pipeline is positioned in the downstream river channel and is used for carrying out ecological flow drainage on the downstream river channel when the water level is higher than or equal to a first preset water level. The invention is used for discharging ecological flow.
Description
Technical Field
The invention relates to a system and a method for discharging the ecological flow in the whole process of a hydraulic junction engineering, and belongs to the technical field of ecological flow discharging.
Background
Ecological flow refers to the minimum water flow required to maintain the ecological balance of the basin in order to maintain the living environment of the basin organism. Therefore, the ecological flow discharge is particularly important in the construction and operation process of hydraulic engineering, and plays an important role in guaranteeing the ecological health of the downstream river basin.
At present, the relief mode of ecological flow in hydraulic engineering mainly includes: and the diversion tunnel is utilized for discharging, the ecological flow unit is arranged for discharging after the dam, and the dam bottom hole is utilized for discharging and the like. In the whole process of hydraulic engineering construction operation, the ecological flow is usually discharged in a fixed discharge mode. In practice, however, the water level and the water pressure of the reservoir can be greatly changed in different stages of the hydraulic engineering, such as a construction stage, a sluice water storage stage, an engineering debugging stage, an engineering operation stage and the like, so that the stability and the drainage effect of the ecological flow drainage structure are greatly affected, and the downstream river channel is possibly caused to be in a cutoff condition when serious, so that the ecological environment of the downstream river channel is damaged.
Therefore, the prior art has the defect that continuous ecological flow discharge cannot be guaranteed in all stages of hydraulic engineering construction operation, and the influence on the downstream ecological environment is easy to cause.
Disclosure of Invention
The invention provides a system and a method for discharging ecological flow in the whole process of a hydraulic junction engineering, which can solve the problems that the prior art cannot guarantee continuous ecological flow discharge in each stage of hydraulic engineering construction operation and is easy to influence the downstream ecological environment.
In one aspect, the invention provides a whole-process ecological flow discharge system of a hydraulic junction engineering, wherein the hydraulic junction engineering comprises a dam, a reservoir at the upstream of the dam and a water turbine unit at the downstream of the dam, and a water intake of the dam is communicated with the water turbine unit through a water supply pipeline; the system comprises:
the water inlet of the diversion tunnel is positioned in the reservoir, and a plugging device is arranged on the water inlet of the diversion tunnel;
The water passing channel is arranged on the plugging device in a penetrating way and is used for discharging ecological flow to a downstream river channel of the dam when the water level of the reservoir is lower than a first preset water level;
the water passing valve is arranged at the water inlet of the water passing channel and used for adjusting the opening of the water passing channel;
And the water inlet of the drainage pipeline is communicated with the water supply pipeline, and the water outlet of the drainage pipeline is positioned in the downstream river channel and is used for carrying out ecological flow drainage on the downstream river channel when the water level is higher than or equal to the first preset water level.
Optionally, the drainage pipeline is specifically configured to drain ecological flow to the downstream river channel when the water level is higher than or equal to the first preset water level and lower than a second preset water level;
And the draft tube of the water turbine unit is used for discharging ecological flow to the downstream river channel when the water level is higher than or equal to the second preset water level.
Optionally, the system further comprises:
one end of the standby pipeline is communicated with the water supply pipeline, and the other end of the standby pipeline is communicated with the draft pipeline, so that ecological flow is discharged to the downstream river channel when the water level is higher than or equal to the second preset water level and the water turbine unit is in a stop state;
and the water supply valve is arranged on the standby pipeline and used for adjusting the opening degree of the standby pipeline.
Optionally, the water outlet of the tail water pipeline is communicated with the middle section of the diversion tunnel.
Optionally, the system further comprises:
and the energy dissipation device is arranged on the standby pipeline and is used for dissipating energy of water flow in the standby pipeline.
Optionally, the system further comprises:
And the layered water taking device is arranged on the water intake and is used for draining surface water in the reservoir to the water supply pipeline.
In another aspect, the present invention provides an ecological flow discharging method based on the whole process ecological flow discharging system of the hydraulic junction engineering, which includes:
and controlling the water passing valve and the water supply valve to work according to the water level.
Optionally, the water passing valve and the water supply valve are controlled to work according to the water level, specifically:
when the water level is lower than the first preset water level, controlling the water passing valve to be opened;
When the water level is higher than or equal to the first preset water level and lower than the second preset water level, the water passing valve is controlled to be closed;
when the water level is higher than or equal to the second preset water level, the water turbine unit is controlled to be started, the water passing valve and the water supply valve are controlled to be closed, and the drainage pipeline is blocked.
Optionally, the method further comprises:
When the water level is higher than or equal to the second preset water level and the water turbine set is in a stop state, the water passing valve is controlled to be closed, the water supply valve is controlled to be opened, and the drainage pipeline is blocked.
Optionally, the method further comprises:
And when the water turbine unit is in a stop state, the water passing valve and the water supply valve are closed, and the drainage pipeline is in a blocking state, controlling the opening of a dam bottom hole.
The invention has the beneficial effects that:
According to the invention, the water passing channel and the water passing valve are arranged on the diversion tunnel, the drainage pipeline is arranged on the water supply pipeline, a special channel is reserved for drainage of ecological flow, and the drainage of ecological flow in the period of sluice water storage under the dam can be effectively ensured; by arranging the standby pipeline and the water supply valve, the invention can effectively ensure the ecological flow discharge during engineering operation and overhaul and avoid damage to the downstream ecological environment.
According to the invention, by controlling the work of the water passing valve and the water supplying valve according to the water level of the reservoir, continuous ecological flow discharge can be ensured at each stage of hydraulic engineering construction operation, and the influence of the engineering construction operation on the downstream ecological environment is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an overall ecological flow discharge system of a hydraulic junction engineering according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a diversion tunnel plugging gate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the installation of a drain pipe according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a layered water intake tower according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a backup pipeline according to an embodiment of the present invention.
List of parts and reference numerals:
1. A dam; 2. diversion tunnel; 3. a layered water intake tower, a 4-type water supply pipeline; 5. a drain line; 6. a water turbine unit; 7. a water return gate; 8. a diversion tunnel water outlet; 9. a dam bottom hole; 10. plugging the tower by using the diversion tunnel; 11. diversion tunnel plugging gate; 12. a water passing valve; 13. a stop log gate; 14. and (5) a standby pipeline.
Detailed Description
The present invention is described in detail below with reference to examples, but the present invention is not limited to these examples.
The embodiment of the invention provides a whole-process ecological flow discharge system of a hydraulic junction engineering, which is shown in figures 1 to 3, and comprises a dam 1, a reservoir at the upstream of the dam 1 and a water turbine unit 6 at the downstream of the dam 1, wherein a water intake of the dam 1 is communicated with the water turbine unit 6 through a water supply pipeline 4; the system comprises:
the water inlet of the diversion tunnel 2 is positioned in the reservoir, and a plugging device is arranged on the water inlet;
The water passing channel is arranged on the plugging device in a penetrating way and is used for discharging ecological flow to a downstream river channel of the dam 1 when the water level of the reservoir is lower than a first preset water level;
The water passing valve 12 is arranged at the water inlet of the water passing channel and used for adjusting the opening of the water passing channel;
and the water inlet of the drainage pipeline 5 is communicated with the water supply pipeline 4, and the water outlet of the drainage pipeline is positioned in the downstream river channel and is used for carrying out ecological flow drainage on the downstream river channel when the water level is higher than or equal to the first preset water level.
Specifically, the water supply pipe 4 in the present embodiment is a penstock.
In practice, the diversion tunnel 2 in the hydraulic junction engineering is mainly used for guiding water in a river channel at the upstream of the engineering to a river channel at the downstream of the engineering during engineering construction so as to reduce interference of water flow to engineering construction, so that the diversion tunnel 2 is a temporary structure for ensuring engineering construction, and after engineering construction is completed and before water is stored in a gate, the diversion tunnel 2 is usually required to be blocked so as to store river water in a reservoir.
In general, during engineering construction, the diversion tunnel 2 actually plays a role in ecological flow discharge for river diversion, but after the diversion tunnel 2 is plugged, the diversion tunnel 2 cannot play a role in ecological flow discharge during the period of sluice water storage and operation of engineering. In order to realize the ecological flow discharge during the water storage and operation of the lower gate, the existing engineering carries out ecological flow discharge through channels such as buried pipes on the side surface or the bottom surface of the diversion tunnel 2, a dam bottom hole 9 and the like, but the channels can generate phenomena such as large vibration, cavitation damage and the like under the conditions of over-high reservoir water level, over-high water pressure, large discharge flow and the like, and the stability of structures such as the buried pipes of the diversion tunnel, the dam bottom hole 9 and the like is seriously affected, so that the above-mentioned modes can not meet the continuous and large-scale ecological flow discharge requirements.
The invention aims to solve the problems, and the original structure of the diversion tunnel 2 and the water supply pipeline 4 for supplying water to the water turbine unit 6 in the engineering are utilized to provide an ecological flow discharge channel, so that the ecological flow discharge can be carried out according to the change of the water level of the reservoir, and meanwhile, the influence of factors such as water pressure and the like on the stability of the discharge channel can be avoided.
Specifically, the plugging device in this embodiment is a diversion tunnel plugging tower 10, and is disposed at the water inlet of the diversion tunnel 2. As shown in fig. 2, a diversion tunnel plugging gate 11 is arranged on the diversion tunnel plugging tower 10, and after engineering construction is completed, the diversion tunnel 2 can be plugged by closing the diversion tunnel plugging gate 11 before the dam is used for storing water.
In this embodiment, through holes are formed in the diversion tunnel plugging gate 11 to form a water channel, so that ecological flow is discharged to the downstream river of the dam 1. In order to conveniently adjust the opening of the water passing channel to control the water flow, the water passing valve 12 is arranged at the water inlet of the water passing channel in the embodiment.
Because the inner diameter of the water passing channel is smaller than that of the diversion tunnel 2, normal water storage of the dam 1 can be ensured, and a drainage channel is reserved for ecological flow. When the water level of the reservoir is higher than or equal to the elevation of the bottom plate of the diversion tunnel 2, part of water flow in the reservoir can flow into the diversion tunnel 2 through the water channel and finally discharged to a downstream river channel through the diversion tunnel 2, so that the discharge of ecological flow is ensured. Meanwhile, the water passing channel is constructed on the basis of the original diversion tunnel 2 of the engineering, and compared with the independent construction of a drainage channel, the construction cost is saved, and the engineering efficiency is improved.
In this embodiment, the specific size of the water channel and the specific setting position on the diversion tunnel plugging gate 11 should be determined by comprehensively considering the reservoir capacity, the ecological flow discharge standard, and the safety and stability of the structures such as the water channel.
In general, the diversion tunnel 2 is located at the lowest layer of the project, the elevation of which is lower, and the elevation of the intake of the dam is higher than that of the diversion tunnel 2. It will be appreciated that dam impoundment is a relatively slow process and that the greater the capacity of the reservoir, the slower the rate of dam impoundment. In the dam water storage process, the water level of the reservoir rises from the diversion tunnel 2 to the water intake of the dam and then rises to other higher positions.
Specifically, in the initial stage of water storage of the lower gate, ecological flow is discharged to a downstream river channel through the water channel, and when the water level of the reservoir is low, the water channel and the water valve 12 are less affected by water pressure and the like, so that stable operation can be realized; when the reservoir water level rises gradually, the water pressure received by the water passing channel and the water passing valve 12 increases gradually, when the reservoir water level is higher than a certain elevation, the excessive water pressure can cause the water passing channel and the water passing valve 12 to vibrate and cavitation, and the continuous vibration and cavitation can damage the concrete structures of the water passing channel, the water passing valve 12 and the periphery.
In order to avoid the above situation, as shown in fig. 1 and 3, the present invention further provides a drainage pipeline 5, where the water inlet of the drainage pipeline is communicated with the water supply pipeline 4, and the water outlet is located in the downstream river, so that the water in the water supply pipeline 4 can be drained into the downstream river as ecological flow.
Because the drainage pipeline 5 is communicated with the dam water intake through the water supply pipeline 4, and the elevation of the dam water intake is higher than that of the diversion tunnel 2, when the water level of the reservoir is higher than or equal to that of the dam water intake, water in the reservoir can flow into the drainage pipeline 5 through the dam water intake and flow into a downstream river channel through the drainage pipeline, so that the purpose of ecological flow drainage is achieved.
Specifically, in this embodiment, the elevation of the first preset water level may be the elevation of the bottom plate of the intake of the dam.
Correspondingly, the water passing channel can be used for discharging ecological flow to a downstream river channel when the water level of the reservoir is lower than a first preset water level; the drainage pipe 5 may be used to drain ecological flow to a downstream river when the water level of the reservoir is greater than or equal to a first preset water level.
When the ecological flow is discharged through the discharge pipeline 5, the water passing channel can be closed by controlling the water passing valve 12, so that continuous vibration and cavitation of the water passing channel and related structures caused by overlarge water pressure can be avoided, the stability of the related structures can be effectively protected, and uninterrupted discharge of the ecological flow is realized.
Specifically, in this embodiment, the height of the bottom plate of the water intake is 20 meters higher than that of the bottom plate of the diversion tunnel 2, so the first preset water level in this embodiment is 20 meters above the bottom plate of the diversion tunnel 2.
Notably, the water supply pipeline 4 is communicated with the water turbine unit 6, when the water level of the reservoir just rises to the height of the water intake bottom plate, water in the reservoir flows into the water supply pipeline 4 through the water intake, but the pressure and flow in the water supply pipeline 4 are too small to start the water turbine unit 6 due to the fact that the water level of the reservoir is low at the moment, and the water in the water supply pipeline 4 is discharged to a downstream river channel through the discharge pipeline 5 as ecological flow.
Along with the continuous rising of the reservoir water level, when the reservoir water level reaches or exceeds a second preset water level, the pressure and the flow in the water supply pipeline 4 can ensure the normal operation of the water turbine set 6, and at the moment, the water turbine set 6 can be started for debugging. After the water turbine unit 6 is started, water in the water supply pipeline 4 flows through the water turbine unit 6 and can be discharged to a downstream river through a draft tube of the water turbine unit 6. Therefore, after the water turbine unit 6 is started, the draft tube of the water turbine unit 6 can be used as a release channel of the ecological flow, and at the moment, the normal operation of the water turbine unit 6 and the release of the ecological flow can be synchronously implemented.
When the ecological flow is discharged through the draft tube of the water turbine unit 6, the draft tube of the water turbine unit 6 can replace the function of the drainage pipeline 5, and meanwhile, in order to avoid the influence on the debugging and operation of the water turbine unit 6 caused by unstable pressure in the water supply pipeline 4 due to the drainage of the drainage pipeline 5, the drainage pipeline 5 can be plugged.
Specifically, the drainage pipeline 5 may be specifically used for performing ecological flow drainage on the downstream river channel when the water level of the reservoir is higher than or equal to the first preset water level and lower than the second preset water level;
The tailpipe of the hydro-turbine unit 6 may be used to bleed the ecological flow to the downstream waterway when the water level of the reservoir is greater than or equal to a second predetermined water level.
Specifically, in this embodiment, the second preset water level is a water level of the reservoir that satisfies the starting condition of the water turbine unit, and when the water level of the reservoir is higher than or equal to the second preset water level, the water turbine unit 6 may start the commissioning.
In particular, since the water flow rate required for the ecological flow rate bleed is smaller than that required for the hydro-turbine set to generate electricity, the pipe diameter of the bleed pipe 5 may be smaller than that of the water supply pipe 4.
In this embodiment, after the water turbine set 6 is started, debugging is performed first, and normal operation is performed after the debugging is completed. During the debugging and operation of the water turbine unit 6, the ecological flow is discharged to the downstream river through the draft tube of the water turbine unit 6.
In practice, after the hydraulic turbine unit 6 is started, the hydraulic turbine unit 6 needs to be maintained and overhauled regularly, during the maintenance and overhauling period, the hydraulic turbine unit 6 needs to be stopped, at this time, the valve for supplying water to the hydraulic turbine unit 6 by the water supply pipeline 4 can be closed, and the ecological flow can not be discharged to the downstream river channel through the draft tube of the hydraulic turbine unit 6 any more, so that the ecological flow has the risk of cutoff.
To avoid this, as shown in fig. 1 and 5, the system may further include:
a standby pipeline 14, one end of which is communicated with the water supply pipeline 4, and the other end of which is communicated with the draft pipeline, and is used for discharging ecological flow to a downstream river channel when the water level is higher than or equal to a second preset water level and the water turbine unit 6 is in a stop state;
a water supply valve provided on the backup pipe 14 for adjusting the opening degree of the backup pipe 14.
Through setting up reserve pipeline 14 and supply valve, when turbine 6 is in the shut down state, can open reserve pipeline 14 through control supply valve, the water in the supply pipe 4 is as ecological flow, flows through reserve pipeline 14 and draft tube, and the relief is to the downstream river course, and the guarantee ecological flow is released incessantly.
Specifically, the water outlet of the draft tube can be communicated with the middle section of the diversion tunnel 2.
According to the embodiment, the draft tube is communicated with the diversion tunnel 2, the ecological flow is discharged by the water outlet 8 of the diversion tunnel, the function of the diversion tunnel 2 is expanded, the utilization rate of the diversion tunnel 2 is improved, and the engineering construction cost is saved.
Specifically, the number of the standby pipes 14 may be plural, and accordingly, the number of the water supply valves may be plural. In this embodiment, four sets of water turbine units 6 and two standby pipelines 14 are connected in parallel between the water supply pipeline 4 and the guide pipe, and between the two standby pipelines 14, the standby pipelines 14 and the water turbine units 6 can be mutually standby and mutually complemented.
Specifically, the system may further include:
The energy dissipation device is arranged on the standby pipeline 14 and is used for dissipating energy of water flow in the standby pipeline 14. The energy dissipating device in this embodiment is an energy dissipating valve.
When the reservoir water level is higher than or equal to the second preset water level, the kinetic energy of the water in the water supply pipeline 4 is larger, if the water is directly discharged to a downstream river channel through the standby pipeline 14, the downstream ecology is adversely affected, so that the energy dissipation valve is arranged on the standby pipeline 14, and the water flow in the standby pipeline 14 can be discharged after energy dissipation.
Specifically, as shown in fig. 1, the system may further include:
The water return gate 7 is arranged at one end of the diversion tunnel 2 close to the water outlet 8 of the diversion tunnel;
And the water inlet of the embedded pipeline is communicated with the draft tube of the turbine unit 6, and the water outlet of the embedded pipeline is positioned in the downstream river.
The hydro-junction engineering of this embodiment also bears the task of regulating water while generating electricity, and the water generated by the hydro-turbine set 6 also needs to be transported to other channels and reservoirs at a far distance through a water transport pipeline. Therefore, the present embodiment blocks the water flow from leaking by providing the normally closed water return gate 7 on the diversion tunnel 2. In order to avoid the influence of the water diversion process on the drainage of the ecological flow, the embodiment is provided with the embedded pipeline at the draft tube of the water turbine unit 6, and part of water flow in the draft tube can be used as the ecological flow to drain into a downstream river channel.
Specifically, the system may further include:
the layered water intake device is arranged on the water intake and is used for draining surface water in the reservoir to the water supply pipeline 4.
In practice, the reservoir is deeper, the temperature of water at the middle and lower parts of the reservoir is lower, the difference between the water temperature and the ambient temperature is larger, and the difference between the water quality and the water quality of the river channel is obvious, if the water quality is discharged to the downstream river channel as ecological flow, the downstream ecology is adversely affected. The water temperature of the surface water of the reservoir has smaller difference with the ambient temperature, the water quality is closer to the water quality of the river channel, and the damage to the downstream ecology can be avoided. Therefore, the layered water taking device is arranged at the water intake of the dam, so that surface water in the reservoir can be drained into the water supply pipeline 4 and discharged into a downstream river as ecological flow.
Specifically, as shown in fig. 1, 3 and 4, the layered water intake device is a layered water intake tower 3. As shown in fig. 4, a stop log gate 13 is disposed on the side of the layered water intake tower 3 facing the reservoir, and the stop log gate 13 can adjust the intake height according to the height of the water level, so that the surface water in the reservoir can be drained to the water supply pipeline 4.
The invention further provides an ecological flow discharging method based on the whole-process ecological flow discharging system of the hydraulic junction engineering, which comprises the following steps:
The water passing valve 12 and the water supply valve are controlled to operate according to the water level.
In this embodiment, the operation of the water passing valve 12 and the water supply valve is controlled according to the water level, which may be specifically:
when the water level is below a first preset water level, the water valve 12 is controlled to open. At this time, the ecological flow is discharged through the water passage.
When the water level is higher than or equal to the first preset water level and lower than the second preset water level, the water passing valve 12 is controlled to be closed. At this time, the water in the water supply pipe 4 is discharged as an ecological flow rate through the drain pipe 5.
When the water level is higher than or equal to the second preset water level, the water turbine unit 6 is controlled to be opened, the water passing valve 12 and the water supply valve are controlled to be closed, and the drainage pipeline 5 is blocked. At this time, the water generated by the turbine unit 6 is discharged as an ecological flow through the draft tube of the turbine unit 6.
Specifically, the method may further include:
when the water level is higher than or equal to the second preset water level and the water turbine set 6 is in a stop state, the water passing valve 12 is controlled to be closed, the water supply valve is controlled to be opened, and the drainage pipeline 5 is blocked. At this time, the water in the water supply pipe 4 flows through the backup pipe 14 as an ecological flow, and is discharged through the draft tube of the water turbine 6.
Specifically, the method may further include:
When the water turbine unit 6 is in a stop state, the water passing valve 12 and the water supply valve are closed, and the drain pipeline 5 is in a blocking state, the dam bottom hole 9 is controlled to be opened. At this time, the dam bottom hole 9 can take on the function of ecological flow relief.
Specifically, the method may further include:
During engineering construction or before the dam 1 is put down to the gate for water storage, ecological flow is discharged to a downstream river channel through the diversion tunnel 2.
By the method, the ecological flow can be discharged by adopting the proper discharge channel according to the situation in each stage of engineering construction period, gate-down water storage period, debugging period, running period, maintenance period and the like, and the ecological flow can be effectively ensured to be continuous on the basis of ensuring the structural stability of the discharge channel.
While the application has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application, and it is intended that the application is not limited to the specific embodiments disclosed.
Claims (6)
1. An ecological flow discharging method based on a whole-process ecological flow discharging system of a hydraulic junction engineering comprises a dam, a reservoir at the upstream of the dam and a water turbine unit at the downstream of the dam, wherein a water intake of the dam is communicated with the water turbine unit through a water supply pipeline; characterized in that the system comprises: the water inlet of the diversion tunnel is positioned in the reservoir, and a plugging device is arranged on the water inlet of the diversion tunnel; the water passing channel is arranged on the plugging device in a penetrating way and is used for discharging ecological flow to a downstream river channel of the dam when the water level of the reservoir is lower than a first preset water level; the water passing valve is arranged at the water inlet of the water passing channel and used for adjusting the opening of the water passing channel; the water inlet of the drainage pipeline is communicated with the water supply pipeline, and the water outlet of the drainage pipeline is positioned in the downstream river channel and is used for carrying out ecological flow drainage on the downstream river channel when the water level is higher than or equal to the first preset water level and lower than the second preset water level; the tail water pipeline of the water turbine unit is used for discharging ecological flow to the downstream river channel when the water level is higher than or equal to the second preset water level; one end of the standby pipeline is communicated with the water supply pipeline, and the other end of the standby pipeline is communicated with the draft pipeline, so that ecological flow is discharged to the downstream river channel when the water level is higher than or equal to the second preset water level and the water turbine unit is in a stop state; the water supply valve is arranged on the standby pipeline and is used for adjusting the opening of the standby pipeline;
The method comprises the following steps:
when the water level is lower than the first preset water level, controlling the water passing valve to be opened;
When the water level is higher than or equal to the first preset water level and lower than the second preset water level, the water passing valve is controlled to be closed;
when the water level is higher than or equal to the second preset water level, the water turbine unit is controlled to be started, the water passing valve and the water supply valve are controlled to be closed, and the drainage pipeline is blocked.
2. The method of claim 1, wherein the outlet of the tailpipe is in communication with a mid-section of the diversion tunnel.
3. The method of claim 1, wherein the system further comprises:
and the energy dissipation device is arranged on the standby pipeline and is used for dissipating energy of water flow in the standby pipeline.
4. The method of claim 1, wherein the system further comprises:
And the layered water taking device is arranged on the water intake and is used for draining surface water in the reservoir to the water supply pipeline.
5. The method according to claim 1, wherein the method further comprises:
When the water level is higher than or equal to the second preset water level and the water turbine set is in a stop state, the water passing valve is controlled to be closed, the water supply valve is controlled to be opened, and the drainage pipeline is blocked.
6. The method according to claim 1, wherein the method further comprises:
And when the water turbine unit is in a stop state, the water passing valve and the water supply valve are closed, and the drainage pipeline is in a blocking state, controlling the opening of a dam bottom hole.
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| CN202410115821.3A CN117646404B (en) | 2024-01-29 | 2024-01-29 | System and method for discharging ecological flow in whole process of hydraulic junction engineering |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008144361A (en) * | 2006-12-06 | 2008-06-26 | Furutochi Kensetsu:Kk | Water management device of dam |
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