Baipenzhu reservoir

Baipenzhu reservoir

Baipenzhu reservoir (B á IP é nzh ū Shu ǐ K ù) is located 34 km northeast of Huidong County and upstream of Xizhijiang, a tributary of Dongjiang River. It is called baimengzhu in situ. Because the terrain of the reservoir area is like a basin, it is renamed Baipenzhu. It was completed in August 1985. The catchment area is 856 square kilometers, and the maximum flood control capacity is 1.22 billion cubic meters. It is a large reservoir for flood control, irrigation, power generation and navigation improvement. The total storage capacity is 1.22 billion cubic meters. The designed irrigation area is 174700 mu, which is the source of Xizhijiang river.

The purpose of the database

The Baipenzhu reservoir was built with the approval of the State Planning Commission, the State Construction Commission, the Guangdong Provincial Planning Commission, the Construction Commission and the Department of water resources and electric power. Its main functions are flood control and irrigation, as well as power generation and improvement of the navigation of the Xizhijiang river. The total benefited area is 320000 mu (including 100000 mu in the middle reaches and 220000 mu in the downstream), which plays a protective role in two cities, one county and one district in the downstream (Huizhou City, Huiyang City, Huidong County and Huicheng District), Huizhou airport, Beijing Kowloon Railway and Guangzhou Shantou highway; it guarantees 175000 mu of irrigated farmland; the installed power generation capacity is 12000kW × 2 units, and the annual power generation capacity is 8600 In the dry season, the downstream water supply should be regulated to ensure industrial and agricultural production and domestic water consumption. With the social and economic development of Huizhou, water resources are increasingly tense, in order to further play the role of Baipenzhu reservoir regulation. In March 2004, Huizhou Municipal People's government issued the notice on adjusting the function of Baipenzhu reservoir (huifuhan No.2). "It is decided that the functions of Baipenzhu reservoir will be adjusted from flood control, irrigation, power generation and water supply regulation to flood control and water supply, with irrigation and power generation taken into account."

Rainfall collection area

Baipenzhu reservoir is located in the upper reaches of Xizhijiang River, the second mainstream of Dongjiang River in Guangdong Pearl River system, with a total length of 176 km. It is about 100 km from the main dam to the confluence of Dongjiang River and Xijiang River in Huizhou, with a drainage area of 4120 square km. Baipenzhu reservoir controls a drainage area of 856 square kilometers, including 49.7 square kilometers of flooded area below the relocation compensation line (82 meters) of the reservoir, about 35 kilometers long (from the main dam to Baokou) and about 5 kilometers wide. Nearly 10 tributaries, including Shijian, Huangyao, Sankeng, Hengkeng, Mashan, Baokou and gaotan, flow into the reservoir.

Reservoir characteristics

The Baipenzhu reservoir project is designed according to the standard of flood with a return period of 500 years and checked with a return period of 5000 years, with a total storage capacity of 1.22 billion cubic meters. Among them, the dead storage capacity is 190 million cubic meters, the effective storage capacity is 385 million cubic meters, and the flood regulation storage capacity is 645 million cubic meters. To ensure the safety of flood discharge in the middle and lower reaches of the river with a return period of 20 years (3540m3 / s), it is conducive to the drainage of waterlogged areas along the river. The main dam is built in Baipenzhu gorge, with concrete hollow buttress gravity dam structure. The dam crest elevation is 88.2m, the dam crest width is 6.0m, the maximum dam height is 66.2m, and the dam crest length is 240m. In the dam, there is a flood discharge weir gate with 2 holes, each hole is 12 meters clear, the weir crest elevation is 73 meters, the upper part is equipped with 9 × 12 meters arc gate, and the lower part of the overflow dam is connected with a long apron trapezoidal differential bucket flip bucket energy dissipation. One bottom outlet is set in the dam, and the pressure pipe in the dam is connected with the open channel. There are two auxiliary dams. One is built at the entrance of wanfu'an in Henggang. When the dam was built in 1960, it was first filled with water and then rolled to an elevation of 72 meters. After the resumption of construction, the whole dam will be heightened and thickened, and the central concrete cutoff wall will be used for reinforcement. The dam crest elevation is 90 meters, the maximum dam height is 40.5 meters, the dam crest width is 8 meters, and the dam crest length is 278 meters. One is built on a strip mountain. The dam is a homogeneous earth dam with the same section size as the auxiliary dam of wanfu'an, and the length of the dam crest is 115m. There is a wharf at the upstream of the dam. In the reservoir area, there is also Pingxi highway rerouting project, with a length of 32.88 km.

Key project

There are main dam, auxiliary dam and power station behind the dam.

The main dam is a concrete hollow gravity dam, which is located at the entrance of Baipenzhu Canyon 1.5km upstream of Baipenzhu town. The dam crest elevation is 88.2m, the length is 240m, and the maximum dam height is 66.2m. The overflow dam is set on the left bank, which is divided into two holes with a clear width of 12m. Two 12 × 9m radial gates are set. The downstream steep slope adopts trapezoidal differential bucket for energy dissipation.

The auxiliary dam is a homogeneous earth dam, which is located about 4 km southeast of the main dam. The dam crest is 278m long, with an elevation of 90m and a maximum height of 40m. A concrete cutoff wall with a thickness of 0.8m is set along the dam axis. On the right side of the earth dam, another bar shaped auxiliary dam is connected with the earth dam, with a top length of 115 meters.

The bottom outlet is set on the right side of the overflow dam, which is a type of open channel connected with the pressure pipe section in the dam. The orifice size is 4 × 4m. The open channel bucket is used for energy dissipation, and one radial gate and one emergency maintenance flat gate are set.

The power station behind the dam is arranged behind the 5 and 6 dam sections on the right bank, and the unit diversion ground powerhouse is adopted. The diameter of diversion steel pipe is 3.4 meters, 2 sets of installed capacity, a total of 24000 kilowatts.

engineering construction

Design

Since 1957, the project has been planned and designed by Guangdong water conservancy and Electric Power Survey and Design Institute, and the design specification was submitted in October 1959. The preliminary design was revised in 1973. In August 1974, the working group of the Ministry of water and electricity conducted on-site review, and approved in November. The project was rebuilt in 1977. In 1979, the auxiliary dam was filled to an elevation of 72m. Due to the poor quality, it was stopped for reexamination. In June 1980, the design institute submitted the "report on review of earth dam of Xizhijiang water control project and selection of reinforcement and continuation scheme". It is considered that the earth dam has quality problems and must be reinforced. The scheme of central concrete cutoff wall is put forward. In August of the same year, the Ministry of water and electricity approved.

The technical construction design of the project started in 1977, and the construction details of the barrage, earth dam and power station were completed at the end of 1981. The design of barrage project won the second prize of excellent design project of Guangdong Province from 1987 to 1985.

construction

At the end of 1959, Huiyang county organized the construction of the project by migrant workers. In August 1960, the project was stopped. The earth dam was resumed in April 1977, and the construction of the earth dam was organized by migrant workers in Huidong County. In August of the same year, the concrete dam project was transferred to the provincial hydropower construction team. In February 1980, the earth dam was transferred to Huiyang hydropower team for construction.

Main dam. From 1959 to 1960, the earth dam was constructed according to the earth dam scheme, and 50000 cubic meters of stonework was excavated for the diversion project. It was changed to concrete dam scheme in 1973, and resumed construction in 1977. The concrete cofferdam was poured in February of the next year, and closed in November, and the open channel was open to water. In November 1981, the lower gate of the diversion channel was changed to the bottom outlet of the dam section. In August 1984, the concrete dam was completed. Main quantities completed (including power station): 398200 cubic meters of concrete and reinforced concrete; 195400 cubic meters of earth excavation; 371500 cubic meters of stone excavation; 33500 cubic meters of earth filling; 21500 cubic meters of stone masonry.

Auxiliary dam. From 1959 to 1960, it was filled to an elevation of 69m by filling in water. From April 1977 to February 1979, the dam was filled to the elevation of 72m by rolling method. Due to the poor quality of dam body filling and irrigation culvert, the work was stopped for comprehensive inspection. After that, the construction was carried out according to the design reinforcement scheme. From May 1981 to November 1982, the first phase of concrete cutoff wall (to the elevation of 72m) was completed by the mechanical construction company of the Provincial Department of hydropower with percussion drill. The back wall was raised to 85m elevation, and the raised part was cast-in-place by Huiyang Hydropower Engineering Company from January to November 1984. By October 1987, the auxiliary dam project was completed. The main quantities include 209300 cubic meters of earth excavation, 494000 cubic meters of filling, 31400 cubic meters of stone masonry, 36400 cubic meters of filling and 11300 cubic meters of concrete.

The total investment of the project is 193 million yuan, including 109 million yuan of project cost, 78.54 million yuan of resettlement and 5.11 million yuan of others. The reservoir area inundated 23400 mu of cultivated land (including 18400 mu of paddy field). The migration population is 21300.

Engineering benefit

Flood control: reduce the flood threat of Huidong and Huiyang counties (districts), Huizhou City and Huizhou airport, and benefit 320000 mu of farmland. The reservoir operated as designed in 1986, which was tested by no.8607 strong typhoon and rainstorm. The water level of Huidong County was reduced by 1.95 meters and the flooded area was reduced by more than 130000 Mu after the reservoir storage.

Irrigation: it can irrigate 170000 mu of farmland. But up to 1987, the construction of the irrigation area project had not started, so the benefit had not yet occurred.

Power generation: the power station was officially put into operation in August 1985. By October 1987, it had generated 163 million kwh of electricity, providing power for local industry and agriculture.

Traffic information

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