Gangnan Reservoir

It was founded in 1958. Located in xigangnan village, Pingshan County, Hebei Province. The reservoir is located in the middle reaches of the Hutuo River, with a total drainage area of 15900 square kilometers, accounting for 68% of the mountainous area of the river.

Gangnan Reservoir

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Gangnan Reservoir is located in Pingshan County, Hebei Province, on the main stream of Hutuo River. Combined with Huangbizhuang reservoir, it can completely control the mountain flood of Hutuo River. It is one of the key projects to harness Hutuo River. It was built in 1958 and intercepted in 1959. The project consists of 1 main dam, 17 auxiliary dams, normal spillway, new spillway, extraordinary spillway, spillway tunnel, water conveyance tunnel, power station, etc. the reservoir is a large-scale water conservancy project with comprehensive utilization of flood control irrigation, power generation and fish culture in the reservoir area. The reservoir is designed by Beijing Design Institute of Ministry of hydropower and constructed by Gangnan Reservoir Engineering Bureau. It was built in March 1958 and completed in 1962. Since the flood storage, it has played a certain role in flood control, irrigation, power generation, etc.

Brief introduction of the project

(1) Gangnan Reservoir is located on the main stream of Hutuo River near Gangnan Town, Pingshan County, Hebei Province, 58km away from Shijiazhuang, the capital of Hebei Province. It is one of the two tributaries of Ziya River System in Haihe River Basin. It is an important large (I) type water control project in the middle and lower reaches of Hutuo River, with a drainage area of 15900km2 and a total storage capacity of 1.571 billion m3. The reservoir is mainly for flood control, water supply and irrigation, combined with power generation, and connected with the Huanghe River at 28km downstream Bizhuang reservoir jointly controls the drainage area of 23400 km2.

(2) Gangnan Reservoir was designed by Beijing survey and Design Institute of the Ministry of water and electricity. The project was started in March 1958 and stopped in 1962. In 1966, it was continued to be built. The main and auxiliary dams were increased by 1m to reach the elevation of 209M. The upstream and downstream slope protection was completed, the normal spillway was rebuilt, the extraordinary spillway was continued, the new spillway tunnel was built, the water conveyance tunnel was strengthened, the surge tank was strengthened, the regulating pool was rebuilt, and the third generator unit was installed. It was basically completed according to the design by the end of 1969. The flood is designed according to the 100 year return period, and the 1000 year return period plus 10% is taken as the check. The check flood level is 207.7 m (Dagu elevation, the same below, Dagu elevation-1.506 = 1985 National elevation datum).

(3) After the "75.8" rainstorm in Henan Province, the hydrological review showed that the dam protection standard of Gangnan Reservoir was on the low side. In 1978, the danger removal and reinforcement was carried out. According to the standard of 5000 year return period, a new 8-hole spillway was built, and the original normal spillway and extraordinary spillway were strengthened. All the works were completed in April 1990. In June 2001, the report series of dam safety appraisal and demonstration of Gangnan Reservoir in Hebei Province was completed. The appraisal conclusion is that the emergency spillway of Gangnan Reservoir has been put into operation less than once every 2000 years, which fails to meet the requirements of "master plan of Gangnan and Huangbizhuang reservoirs" for once every 5000 years, endangering the safety of Huangbizhuang reservoir. The main dam, auxiliary dam and other main buildings have safety problems. In 2003, the Ministry of water resources has approved the preliminary design of Gangnan Reservoir Reinforcement Project, and the reservoir will soon implement the reinforcement project of heightening the dam.

(4) At present, the flood control standard of the reservoir is less than the flood with a return period of 5000 years. After 30 years of application, it has played a great role in flood control, irrigation, power generation and so on. In 1996, the peak discharge of Gangnan Reservoir is 7010 m3 / s, which is close to the 50 year return period. The reduction value of the inflow peak discharge of Huangbizhuang Reservoir in the lower reaches is 18200 m3 / s, which is more than 100 year return period. After 23 hours of peak shifting between Gangnan Reservoir and the interval, the maximum discharge is 2265 m3 / s, which greatly reduces the disaster degree in the lower reaches. Gangnan Reservoir is also responsible for supplying water to Shijiazhuang, the provincial capital, and Xibaipo Power Plant, with an annual water diversion of 193 million m3. The irrigation canals directly diverting water from Gangnan Reservoir include Yingang canal, Dachuan canal and Beiyue canal. The direct irrigation area of the reservoir is more than 200000 mu. The annual average amount of water flowing into Huangbizhuang reservoir is 550 million m3, and the irrigation area is more than 2 million mu through the re regulation of Huangbizhuang Reservoir. Irrigation area is an important grain base in Hebei Province.

Technical index

2-1 watershed characteristics

Hutuo River originates from the northern foot of Wutai Mountain in Fanshi County, Shanxi Province. It is one of the two major tributaries of Ziya River System in Haihe River Basin, with a length of 587km and a drainage area of 24960km2. The drainage area controlled by Gangnan Reservoir is 15900km2, and the drainage area jointly controlled by Gangnan reservoir and Huangbizhuang reservoir is 23400km2. The basin has a continental climate. The annual average rainfall varies greatly in different regions, and more than 80% of it is concentrated in June to September of the flood season. The annual average temperature is 12.9 ~ 4.1 ℃, the annual average evaporation is 1239mm, the annual average wind speed is 1.7 ~ 9.0m/s, the annual average sediment discharge is 9.31 million tons, and the annual average runoff is 1.66 billion m3. In 1996, the peak discharge of Gangnan is 7010 m3 / s, which is the largest flood since the construction of the reservoir. The maximum flood level of the reservoir is 203.13m.

2-2 dam

The main dam was built in March 1958, continued in 1966 and completed in 1969. The left and right abutments are homogeneous earth dam and the transition section from homogeneous earth dam to clay inclined wall dam. The upstream is provided with masonry wave wall, and the downstream abutment is provided with masonry curb. The upstream of the main dam is dry masonry slope protection

After the reinforcement of the reservoir, the main dam is clay inclined wall dam, the upstream is equipped with masonry wave wall, the upstream and downstream of the dam are dry masonry slope protection, and the upstream of the main dam is dry masonry slope protection.

The auxiliary dam was completed in the winter of 1968. There are 16 auxiliary dams distributed on both sides of the main dam, including 11 on the left bank. From the normal spillway to the left head of the main dam, the auxiliary dam on the left bank is asphalt concrete pavement. The upstream of the dam crest is equipped with masonry wave wall. The upstream dam slope is dry masonry revetment and the downstream is pebble revetment. The auxiliary dam on the right bank is located on the right side of the main dam. The dam crest is made of mud bound macadam. The upstream of the dam crest is provided with masonry wave wall. The upstream dam slope is provided with dry masonry slope protection and the downstream is provided with ballast slope protection. The measures of heightening the auxiliary dam are basically the same as those of the main dam.

2-3 spillway

The spillway consists of normal spillway and new spillway. The normal spillway is located on the left side of the auxiliary dam on the left bank and is composed of approach channel section, gate chamber section, chute section, flip bucket section and tailrace channel. The left and right side piers of the lock chamber are concrete gravity retaining walls. The water flows through the approach channel, lock chamber section and chute section, then flows into the tailrace channel through flip flow energy dissipation, and finally flows into the lower Hutuo River.

The newly added spillway is located on the right side of the normal spillway and consists of five parts: approach channel section, gate chamber section, chute section and flip bucket section, anti scour plate and guide wall and tailrace channel.

2-4 outlet tunnel

The outlet tunnel is composed of a spillway tunnel and a water conveyance tunnel. The spillway tunnel is located on the right bank of the main dam and adjacent to the water conveyance tunnel (located on the right side of the water conveyance tunnel). The spillway tunnel is composed of a circular pressure tunnel section, a city gate tunnel type non pressure tunnel section, a flood discharge open channel section and a city gate tunnel type non pressure tail tunnel section, and its structure is relatively complex.

The water conveyance tunnel is located on the right bank of the main dam, which is a dual-purpose tunnel for flood discharge and power generation. The inlet of the water conveyance tunnel is in the shape of a trumpet, and there is an elliptic curve contraction section between the inlet and the gate. The inlet is equipped with a flat steel gate, a fixed winch hoist, and a vent behind the gate.

2-5 Hydropower Station

The total installed capacity of the hydropower station is 41000kw, of which two are 15000kw and the other 11000kW.

Architectural history

In August 1956, the largest flood occurred in Hutuo River. According to the new hydrological data, the relevant departments revised and supplemented the key points of planning. In April 1958, Beijing survey and Design Institute made the supplementary preliminary design of Gangnan Reservoir project according to the examination opinions of the Ministry of water and electricity and the State Construction Commission. On June 16, 1958, the Ministry of water and electricity approved the supplementary preliminary design of Gangnan Reservoir and approved the formal commencement of Gangnan Reservoir. Gangnan Reservoir Project was built in 1958. It was continued from 1963 to 1965. In 1966, the scale of Gangnan Reservoir Project was determined by the design of 100 years design and 1000 years plus 10% check. The maximum flood level was 207.7m and the maximum storage capacity was 1.571 billion cubic meters. After the rainstorm in Henan Province in August 1975, in order to improve the flood control and dam protection standard of the reservoir, an additional 8-hole spillway was built in 1978, which was basically completed in 1986. After 1981, the new hydrological results of Ganghe and Huanghe reservoirs put forward by the Design Institute of Hebei Provincial Water Resources Department were put into use. The original design flood of one thousand years was only equivalent to the 500 year return period of the new hydrology. After the new spillway was built, the original two spillways were reinforced and reconstructed, the flood control and discharge capacity was greatly improved, and the flood control and dam protection standard reached the once-in-5000-year return period; the current flood control standard of Gangnan Reservoir was designed for once-in-500-year return period, and checked for less than once-in-5000-year return period. From 1978 to 1990, the current flood control standard of the project reached once in 5000 years, the total discharge of the discharge structure was 19950 m3 / s, and the highest flood level was 208.09m.

In 2003, the reinforcement project of Gangnan Reservoir will be implemented, with a construction period of two years,

Chinese PinYin : Gang Nan Shui Ku