CN-121992742-A - Reservoir area and under-dam mixed water taking and regulating system and regulating method thereof

CN121992742ACN 121992742 ACN121992742 ACN 121992742ACN-121992742-A

Abstract

The invention discloses a reservoir area and under-dam mixed water taking and regulating system and a regulating method thereof, which can be used for mixing and taking water from the reservoir area and under-dam, fully utilizing a high-quality water source, lifting and storing under-dam tail water in a high-level regulating reservoir by using low-cost electricity through a water lifting pump station, supplementing stored water through a water supplementing tunnel when the flow of a main water conveying tunnel is insufficient, reducing engineering operation cost to the greatest extent, reducing land solicitation through regulation of the underground tunnel reservoir, simultaneously providing an effective flushing structure, and better maintaining the reservoir capacity of a water guiding tunnel, thereby having the advantages of strong water supply guarantee capability, low operation cost and small policy treatment difficulty.

Inventors

JIE SHAOPENG
QIAO YANWEI
WANG WENJIE
YE MIN
YU DESHUANG
HE LEI
CHENG HUAN
LI YING
ZHOU HAILIN

Assignees

浙江省水利水电勘测设计院有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260402

Claims (10)

1. The reservoir area and under-dam mixed water taking and regulating system is characterized by comprising a reservoir area water intake gate, an upstream flowmeter, a main water delivery tunnel, a downstream flowmeter, a tail water regulating tank, a diversion barrage, an under-dam water intake gate, a diversion tunnel reservoir, a water pumping station, a water pumping tunnel, a high-order regulating tunnel reservoir, a water supplementing gate, a water supplementing tunnel, a communication gate and a high-order reservoir; the reservoir area water intake gate is arranged at the reservoir bank and is connected with the reservoir and the main water delivery tunnel and used for controlling the water delivery flow of a reservoir water source; the upstream flowmeter is arranged on the main water delivery tunnel close to the gate of the water intake of the reservoir area and is used for measuring the water delivery flow of the reservoir water source; the main water delivery tunnel is communicated with the reservoir, the target water plant and the water supplementing tunnel and is used for delivering a water source to the target water plant; the downstream flowmeter is arranged at the downstream of the main water delivery tunnel and is used for measuring the total water supply flow to the target water plant; the downstream side of the tail water regulating tank is provided with the diversion barrage, and the diversion barrage is formed by surrounding a downstream river bank and the diversion barrage and is communicated with a power station tail water pipe and the diversion water hole warehouse; The diversion barrage is arranged at the downstream side of the tail water regulating tank, is positioned at the downstream of the tail water outlet of the power station and the inlet of the diversion water hole warehouse and is used for properly raising the water level of the tail water regulating tank, and the water of the tail water regulating tank is led into the diversion water hole warehouse when the power station generates electricity; the under-dam water intake gate is positioned at the inlet of the water diversion cavity reservoir and is used for controlling water inlet and outlet of the water diversion cavity reservoir; The drainage hole storage is connected with the tail water regulating tank and the water inlet pipe of the water lifting pump station, and the drainage hole storage inlet is provided with the under-dam water intake gate for storing the power generation tail water of the power station; The water lifting pump station is arranged at the front end of the water lifting tunnel, pumps water from the water guiding hole warehouse, and then pressurizes and conveys the water to the water lifting tunnel; The lifting tunnel is connected with the booster pump station and the high-position storage-regulating hole warehouse, and the pressurized water of the lifting pump station is conveyed to the high-position storage-regulating hole warehouse; The high-level storage warehouse is connected with the water lifting tunnel, the communication tunnel and the water supplementing tunnel, the water level of the high-level storage warehouse is slightly higher than that of the reservoir, and the high-level storage warehouse and the high-level reservoir are used for storing dam-down water conveyed by the water lifting tunnel; the water supplementing tunnel is communicated with the high-level regulation and storage tunnel library and the main water delivery tunnel and is used for supplementing stored water in the high-level regulation and storage tunnel library into the main water delivery tunnel and filling a flow supply and demand gap of the main water delivery tunnel; the water replenishing gate is arranged on the water replenishing tunnel and used for controlling water replenishing flow and simultaneously preventing water in the main water conveying tunnel from flowing back into the high-level regulation and storage tunnel warehouse; The communication tunnel is used for communicating the high-level storage hole reservoir with the high-level reservoir; The communication gate is arranged on the communication tunnel, so that the high-level regulation hole reservoir and the high-level reservoir can be isolated and independently operated, and the high-level regulation hole reservoir and the high-level reservoir can be maintained and maintained conveniently; The high-level reservoir is an open-air reservoir built at a high level or a mountain top according to the topography and geological conditions, and is connected with the high-level regulation and storage hole reservoir through the communication tunnel to store dam-down water conveyed by the water lifting tunnel.
2. The mixed water intake and regulation system under a reservoir area and a dam of claim 1, further comprising a flushing pipe and a flushing valve; the flushing pipe is connected with the tail part of the drainage hole storage and the bottom part of the high-level regulation hole storage and is used for sending water in the high-level regulation hole storage back to the tail part of the drainage hole storage so as to flush sediment in the drainage hole storage to the tail water regulating tank; The flushing valve is arranged on the flushing pipe and close to the water guiding and storing hole reservoir and is used for controlling flushing of the water guiding and storing hole reservoir.
3. The system for mixed water intake and regulation under a reservoir area and a dam according to claim 1 or 2, wherein the water diversion dam is an overflow dam or at least has an overflow dam section long enough, the height of the overflow dam top is lower than the highest tailwater level of power generation of a power station, and the system has drainage and sand flushing functions; The diversion barrage can be a rubber barrage, a bottom shaft turning plate gate barrage, a concrete barrage or a combination of the two modes; the drainage sand washing function of the diversion barrage can be realized by arranging a drainage sand washing pipe at the bottom of the barrage body or arranging a sand washing gate on the barrage body.
4. The system for mixing water intake and regulation under a reservoir area and a dam according to claim 1 or 2, wherein the water level gauges are arranged in the water diversion hole reservoir, the high-level regulation hole reservoir and the high-level reservoir to monitor real-time water level, and three characteristic water levels of lowest operation water level, design water level and highest operation water level are arranged for guiding operation control.
5. The system for mixed water intake and regulation under a reservoir area and a dam according to claim 1 or 2, wherein the water-guiding reservoir is pressureless, the top is provided with a manhole and a vent hole, the bottom Gao Chenglve of the inlet of the reservoir is higher than the external riverbed, the elevation of the bottom of the reservoir is provided with an upward inclination angle from the inlet to the inside, and the system is beneficial to cleaning and flushing the inside of the reservoir while effectively reducing sediment deposition in the reservoir; The water guiding and storing hole warehouse can be an independent hole warehouse or a plurality of connected hole warehouses; the high-level storage hole warehouse is a pressureless hole, and the top of the high-level storage hole warehouse is provided with a man-entering overhaul hole and an air vent; The high-level storage hole warehouse can be an independent hole warehouse or a plurality of connected hole warehouses.
6. The system of claim 1 or 2, wherein the high-level reservoir and the high-level reservoir are interchangeable in relative positions.
7. The method for regulating and accumulating the mixed water intake and regulation system under the reservoir area and the dam as set forth in claim 1, wherein the method comprises the following steps: If the flow of the gate at the water intake of the reservoir area can meet the water supply requirement in the month of low water consumption of the target water supply city, closing the water supplementing gate to prevent the water body of the main water delivery tunnel from flowing backwards to the high-level regulation and storage hole reservoir; If the water consumption of the target water supply city is increased, the flow of a water intake gate of a reservoir area cannot meet the water supply requirement, and the water supplementing requirement can be met only by starting the reservoir capacity of the high-level regulation and storage hole, the communication gate is kept closed, the water evaporation, leakage and potential water pollution risks caused by the water flowing into the high-level reservoir are avoided; If the water consumption of the target water supply city is continuously increased and the capacity of the high-level storage hole reservoir cannot meet the water supplementing requirement, the communication gate is opened to start the high-level reservoir, and the communication gate and the high-level storage hole reservoir are used for jointly regulating and supplementing water; If the water consumption of the target water supply city begins to be gradually reduced and the capacity of the high-level storage hole reservoir can meet the water replenishing requirement, firstly, the communication gate is considered to be closed, the high-level reservoir is stopped, the high-level storage hole reservoir is only used for regulating, storing and replenishing water, the water guiding hole reservoir and the water lifting pump station are kept started, the operation duration of the water lifting pump station is properly shortened, the rotation speed of the pump set is reduced, or the number of pump set operation stations is reduced; If the water consumption of the target water supply city is continuously reduced, when the water is not needed to be supplemented by the high-level storage hole warehouse, the water lifting pump station is shut down, when the water level of the high-level storage hole warehouse is reduced to the designed water level, the water supplementing gate is closed, and finally, the gate of the water intake under the dam is closed.
8. The method for regulating and accumulating the water in the reservoir area and the under-dam mixed water intake and accumulating system according to claim 7, wherein the operation scheduling mode of the water pumping station is characterized in that the water pumping station stops operating in the electricity utilization peak period, the electricity charge is high, the operation charge is reduced as much as possible, the electricity charge is low in the electricity utilization valley period, the water pumping station can be started to pump water to the high-level water accumulating station if the water level of the water accumulating tank is higher than the lowest operation water level and the water level of the high-level water accumulating tank is lower than the highest operation water level, and the water pumping station is stopped if the water level of the water accumulating tank is lower than the lowest operation water level or the water level of the high-level water accumulating tank is higher than the highest operation water level.
9. The method for regulating reservoir area and under-dam mixed water intake and regulation system of claim 7, wherein the operating principle of the under-dam water intake gate is that when a water lifting pump station operates, the under-dam water intake gate is kept in an open state to enable water in a tail water regulating tank to smoothly enter a water drainage hole reservoir, and when the water lifting pump station stops operating for a long time, the under-dam water intake gate is closed to prevent sediment in the tail water regulating tank from entering the water drainage hole reservoir.
10. A method for regulating reservoir area and under-dam mixed water intake regulation system according to claim 7 is characterized in that the operation principle of flushing the water-guiding hole reservoir is that flushing operation of the water-guiding hole reservoir is carried out when a power station and a water lifting pump station stop running for a long time, firstly, a water-guiding barrage is converted into a water-draining and sand-flushing state, water and sediment in a tail water regulating tank are emptied, secondly, a gate of an under-dam water intake is opened, water in the water-guiding hole reservoir is emptied, then a flushing valve is opened, water in the high-order water-guiding hole reservoir is used for flushing the water-guiding hole reservoir, sediment in the water-guiding hole reservoir is flushed to a tail water regulating tank, after flushing is completed, the flushing valve is closed, the gate of an under-dam water intake of the water-guiding hole reservoir is closed, and the water-guiding barrage is restored to the water-retaining state before the next water lifting pump station is started, and the gate of the under-dam water intake is opened.

Description

Reservoir area and under-dam mixed water taking and regulating system and regulating method thereof Technical Field The invention relates to a water diversion and regulation engineering technology, in particular to a reservoir area and under-dam mixed water taking and regulating system and a regulating method thereof. Background Many cities face the problem of water resource shortage due to uneven spatial and temporal distribution of water resources, and water needs to be regulated from a water source area through long-distance water guiding and regulating engineering to meet water supply requirements. Reservoirs are used as important water source sites, a reservoir area water taking mode is generally adopted, and water is led to a target water plant through a water delivery tunnel. However, reservoir operation is affected by various factors such as seasonal hydrologic variation, power generation scheduling, ecological flow rate drainage and the like, and the water intake flow rate of a reservoir area is difficult to meet the continuously-increased water demand of a city in certain periods, and particularly, the water supply guarantee capability is insufficient in a dead water period or a water peak period. On the other hand, tail water generated by a reservoir power station is usually directly discharged into a downstream river channel, so that the tail water cannot be effectively utilized, and waste of high-quality water resources is caused. Although partial engineering attempts to set a water intake under a dam and utilize tail water resources, the regulation and storage means of the system are lacked, so that space-time regulation of the water resources is difficult to realize, and the flow gap of a main water delivery system cannot be stably supplemented. The existing regulation facilities mostly adopt ground reservoirs or regulating ponds, and have the problems of large land-feature difficulty, high construction cost, prominent ecological environment influence and the like. Especially in mountain areas or areas with shortage of land, the land-sign policy is complicated to handle, which restricts the implementation of engineering. In addition, the traditional regulation facility has defects in sediment accumulation control, and the storage capacity loss is serious after long-term operation, so that the sustainable operation of the system is influenced. The method of constructing the underground cave depot can avoid a great deal of land characterization and reduce the policy processing difficulty. Chinese patent CN214033574U discloses a pressure-regulating automatic flushing non-pressure hole structure, the upstream is connected with the water outlet pipe of the downstream of the pumping station, the downstream is connected with a pressure or non-pressure main water delivery tunnel, and the structure mainly comprises a water storage hole section, an inlet retaining wall, a water inlet pipe, a sand basin, an automatic flushing system, a vent hole and the like. The non-pressure hole technology is structurally characterized in that a hole warehouse is not provided with an inspection manhole, the flushing of the hole warehouse also needs to utilize the height difference between internal and external terrains, and is not suitable for a regulating tank and a water storage tank for water inflow of a pump station, and the technology is similar to a water outlet tank of the pump station in function, but does not involve the matching and scheduling problems with a water delivery system. Therefore, it is necessary to provide a novel water intake regulation system, which can comprehensively utilize reservoir area water sources and under-dam power generation tail water, realize low-cost and high-efficiency water resource storage and scheduling through underground cave depot groups, improve the flexibility and reliability of a water supply system, and simultaneously reduce the difficulty and cost of engineering construction and operation and maintenance. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a reservoir area and under-dam mixed water taking and regulating system and a regulating method thereof, and water is taken from the reservoir area and under-dam respectively; the water intake of the reservoir area is a main water intake and is connected with a main water delivery tunnel, the water intake under the dam is an auxiliary water intake, a water diversion barrage, a water diversion tunnel reservoir and a water lifting pump station are arranged, a water outlet pipeline of a pump station is connected with a high-level regulation tunnel reservoir and a high-level reservoir at the height of a bank slope, the high-level regulation tunnel reservoir is communicated with the original main water delivery tunnel through a water supplementing tunnel and a water supplementing gate, and all raw water is delivered to a target city water plant through the main water delivery tu