CN-121976501-A - Multipurpose protection canal suitable for pumping and storing reservoir and operation method thereof

CN121976501ACN 121976501 ACN121976501 ACN 121976501ACN-121976501-A

Abstract

The invention provides a multipurpose protection channel suitable for a pumped storage reservoir and an operation method thereof, wherein the multipurpose protection channel is arranged on the outer side of a circular reservoir path of a pumped storage power station with one or more than one flushing channel, the multipurpose protection channel comprises a water delivery channel section arranged along the circular reservoir path, the outer side of the water delivery channel section is connected with one or more than one flushing channel, water outlets are arranged at two ends of the water delivery channel section, a water supplementing gate is arranged at the water outlet of a first end, the other side of the water supplementing gate is communicated with a bank retaining wall of the upper or lower reservoir of the pumped storage power station, an overflow weir is arranged at the water outlet of a second end, the downstream of the overflow weir is used for being connected with the overflow weir, the overflow weir is positioned beside the upper or lower reservoir dam and is directly communicated with a downstream river channel, and the weir top elevation of the water supplementing gate is lower than the weir top elevation and higher than the normal water level of the reservoir. The invention can introduce clean incoming water into the reservoir on the basis of effectively intercepting mountain torrent sediment and defending geological disasters so as to increase the power generation benefit.

Inventors

ZHU RUICHEN
GAO LINGANG
WANG YING
ZHU ZHIFENG
TIAN YINGCHUN
ZHANG YELIN
HAN YIFAN
ZHANG HONGSHENG

Assignees

中国电建集团华东勘测设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260123

Claims (9)

1. A multipurpose protection canal suitable for a pumped storage reservoir is characterized in that the multipurpose protection canal is arranged on the outer side of a circular reservoir path of a pumped storage power station or a lower reservoir with one or more than one flushing canal and is positioned between the circular reservoir path and an excavated slope, the multipurpose protection canal comprises a water delivery canal section arranged along the trend of the circular reservoir path, the outer side of the water delivery canal section is connected with the one or more than one flushing canal, water outlets are arranged at two ends of the water delivery canal section, a water supplementing gate is arranged at the water outlet of a first end, the other side of the water supplementing gate is communicated with a reservoir bank retaining wall of the upper reservoir or the lower reservoir of the pumped storage power station, an overflow weir is arranged at the water outlet of a second end and is used for being connected with a spillway, the spillway is positioned beside the upper reservoir or the lower reservoir, the overflow weir is directly communicated with a downstream river channel, and the top elevation of the water supplementing gate is lower than the top elevation of the overflow weir and is higher than the normal water level of the reservoir.
2. The multipurpose protective canal for pumping and accumulating reservoirs according to claim 1, characterized in that a slot is formed on the upper part of the side wall of the water delivery canal near the side of the flushing canal, and the slot is arranged corresponding to the flushing canal, so that water flow in the flushing canal can directly enter the water delivery canal through the slot.
3. The multipurpose protective canal for pumping and accumulating reservoirs according to claim 2, characterized in that a sand setting tank is arranged on the outer side of the side wall of the water delivery canal near the side of the flushing canal, the sand setting tank is arranged corresponding to the slotting, and the bottom elevation of the sand setting tank is lower than the elevation of the weir crest of the slotting, so that when the flushing canal normally flows or the silt-containing torrent occurs, the sand setting tank can perform sedimentation interception on part of silt in the passing water flow.
4. The multipurpose protective canal for pumping and accumulating reservoirs according to claim 1, wherein a sand blocking ridge is arranged in the water conveying canal section, the sand blocking ridge is arranged on the upstream side of the water outlet of the first end, and a water supplementing culvert is connected between the water supplementing gate and a reservoir bank retaining wall of the upper or lower reservoir.
5. The multipurpose guard channel for an extraction and storage reservoir of claim 2 wherein said slotted weir crest elevation is higher than said weir crest elevation of said overflow weir.
6. The multipurpose protective canal for a pumping and accumulating reservoir according to claim 1, wherein the top elevation of the side walls at both sides of the multipurpose protective canal is higher than the top elevation of the endless road.
7. The multipurpose protective canal for pumping and accumulating reservoir according to claim 1, characterized in that the bottom of the overflow weir is provided with an ecological bypass pipe with a control valve, the water inlet end of the ecological bypass pipe is communicated with the upstream water channel of the overflow weir, and the water outlet end is communicated with the spillway.
8. The operation method of the multipurpose protection canal suitable for the pumping and accumulating reservoir is characterized in that when normal inflow or silt-containing mountain floodwater occurs in the gully, the multipurpose protection canal according to any one of claims 1-7 is adopted, water flows through a grit chamber to intercept part of silt and enter a water delivery canal section from a groove, and operation control under different working conditions is realized by controlling the opening and closing of a water supplementing gate, and the operation control method comprises the following working conditions: A. During normal operation, the gully flows normally, the sand content in water flow is low, the gate of the water supplementing port is kept open, and water which is gathered in the water conveying channel section by the gully can be introduced into the upper or lower reservoir to supplement the water loss quantity of the upper or lower reservoir or increase the power generation water quantity; B. when the flood discharging working condition is adopted, a ditch generates silt-containing mountain floods, the water flow contains more sand, a water supplementing gate is closed, and the water which is gathered in a water conveying channel section by the ditch is discharged from a spillway to enter a downstream river channel; C. When the reservoir is under maintenance working conditions, the reservoir is required to be emptied and overhauled, the water supplementing gate is closed, the multipurpose protection channel serves as a diversion drainage channel in the maintenance period, water which is collected into the water conveying channel section by the flushing channel is discharged from the spillway to enter a downstream river channel, and the dry maintenance state of the reservoir is ensured; D. When ecological retention working conditions are met, when ecological water is required in a dead water period or a downstream river, a control valve of the ecological bypass pipe is opened, and water flow in the water delivery channel is directly led into the spillway and discharged to the downstream river so as to maintain ecological flow of the downstream river.
9. The operation method of claim 8, wherein the water replenishing gate is closed, the sand basin intercepts a part of solid matters when the debris flow occurs in the gully under the special working condition, the solid-liquid mixture of the residual debris flow enters the water delivery channel section through the slot, the solid matters are deposited in the water delivery channel section, the thin matters are discharged into a downstream river channel through the spillway, and the solid matters deposited in the water delivery channel section can be removed by using the mini-excavator after the debris flow occurs and in daily operation.

Description

Multipurpose protection canal suitable for pumping and storing reservoir and operation method thereof Technical Field The invention relates to the technical field of hydraulic building design construction and operation management, in particular to a multipurpose protection canal suitable for a pumping and accumulating reservoir and an operation method thereof. Background The upper and lower reservoirs of the pumped storage power station are usually built by surrounding natural gullies or topographic depressions in mountain areas, and the periphery of the reservoir bank is often complicated in topography and large in catchment area due to the mountain areas at the ground, and a plurality of natural gullies exist. In the operation period of the power station, the surface runoff of the peripheral mountain and the incoming water of the gully are important influencing factors of the water environment of the reservoir. At present, aiming at the drainage design around the reservoir bank of the pumped storage power station, a mode of directly discharging into a reservoir is generally adopted, or a mode of arranging a conventional intercepting ditch or a drainage ditch along the inner side or the outer side of a reservoir bank road is adopted, and the conventional single drainage mode has the following remarkable defects in actual operation: (1) Sediment accumulation and equipment wear problems. During mountain storm or flood, the incoming water of the gully often carries a large amount of sediment, stones, even branches and other sundries, if the muddy water with extremely high sediment content is directly collected into the reservoir, on one hand, sediment accumulation in the reservoir can be caused, the effective reservoir capacity adjustment of the reservoir can be reduced, on the other hand, high sediment-containing water flow enters the water delivery power generation system, serious abrasion and cavitation can be generated on the unit, the service life of the unit can be shortened, and the operation and maintenance cost can be increased. (2) Waste of water resources and loss of power generation benefits. To avoid the sediment problem, the existing designs tend to trap all the peripheral runoff through the intercepting ditch and discharge the runoff to the downstream river outside the warehouse. However, under the working condition of flood prevention or normal rainfall, most of the water coming from the gully is clear water with better water quality, and the water is drained away, so that not only is the waste of water resources caused, but also the precious water quantity which can be used for power generation is lost. (3) The difficult diversion during reservoir maintenance. When the reservoir is required to be emptied and overhauled, the reservoir bottom is required to be ensured to be in a dry working state, the existing drainage facilities are difficult to thoroughly cut off continuous water supply of the gully during overhauling, an external water source is caused to continuously flow into the reservoir, the difficulty and the cost of overhauling and drainage are increased, and the overhauling period is even influenced. (4) The geological disaster prevention capability is insufficient. Natural disasters such as debris flow are easy to occur in mountain areas, the traditional intercepting drainage ditch is single in section form and limited in function, and sand setting, blocking and early warning mechanisms are absent. Once the debris flow happens, the drainage ditch is easy to be blocked and overflowed, then burst storage paths are flushed, even a large amount of debris flow substances are directly flushed into the reservoir, and serious threat is formed to the safety of the power station. Therefore, the multipurpose protection canal suitable for the pumping and accumulating reservoir and the operation method thereof are developed, which not only can effectively intercept sediment and defend geological disasters, but also can flexibly switch the modes of water supplementing and accumulating and flood discharging according to the water quality condition, and can give consideration to the reservoir maintenance and diversion requirements, and are the technical problems to be solved in the engineering design and operation management of the current pumping and accumulating power station. Disclosure of Invention The invention provides a multipurpose protection canal suitable for a pumping and accumulating reservoir aiming at the defects that the existing pumping and accumulating power station reservoir bank drainage facility has single function and cannot take water resource utilization and sediment protection into account, the protection canal can effectively intercept mountain torrents and silt and defend geological disasters, and can introduce clean incoming water into the reservoir so as to increase the power generation benefit, and meanwhile, reliable interception diversion conditions are provided for t