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Western Network News (Reporter Li Zhuoran Song Yang) Tower cranes are lined up, machines are roaring, excavators and material trucks are shuttling back and forth, and more than 1,000 construction workers are performing their duties and are busy working, a busy and lively scene......
On June 26, the theme interview activity of "High-quality Development Research Trip" organized by the Propaganda Department of the CPC Central Committee came to the construction site of the Dongzhuang Water Conservancy Project located at the junction of Qigan Town, Liquan County, Xianyang City and Chewu Town, Chunhua County. The reporter of the starting point news and western network looked at the scene, and the dam of the pivotal project cut off the Jinghe River, and the magnificent style began to appear. A "Gaoxia Pinghu" integrating flood control and siltation reduction, water supply, power generation, and ecological improvement, with a total storage capacity of 3.276 billion cubic meters, is turning the blueprint into reality on the Weibei Plateau.
"At present, the highest section of our double-curved arch dam has been poured to 116 meters, and 910,000 square meters of concrete stone have been poured, accounting for about 47% of the entire project; The civil works of the downstream cushion pond and the second dam project have been completed; The construction of the hydropower generation system project has been completed, and the anti-seepage project of the dam in the reservoir area is steadily advancing. Bai Bingnan, director of the engineering management department of Dongzhuang Water Conservancy Company of Shaanxi Water Development Group, said that it is expected that by 2026, the Dongzhuang Water Conservancy Project can be completed. After the completion of the project, it will become a water conservancy project with the largest storage capacity and the highest dam height in Shaanxi.
Aerial view of the construction site of Dongzhuang Water Conservancy Project.
The Jing River is the largest tributary of the Wei River, controlling 70% of the sediment from the Wei River and 1/6 of the sediment from the Yellow River. In order to ensure the long-term stability of the Wei River, we must firmly grasp the "bull's nose" of water and sediment relationship adjustment.
"As the world's first extra-high arch dam with flood control and siltation reduction as the main task and the extra-high arch dam with the largest sediment content and unit water and sediment load, flood control and siltation reduction is the most important function of the Dongzhuang Water Conservancy Project." Bai Bingnan said: To solve the problem of uncoordinated relationship between water and sediment in the Jing River, the key is to divert water and sediment.
Aerial view of the construction site of Dongzhuang Water Conservancy Project.
"After observation and testing, we found that when the water flow velocity is less than 300 cubic meters per second, the sand will show a state of metamorphosis, and a large amount of sediment will be deposited in the river channel, resulting in the siltation of the river channel, the uplift of the river bed, and the weakening of the flood discharge capacity; When the water velocity is 300 to 600 cubic meters per second, the sediment is partly shifting and partly suspended. When the water velocity is greater than 600 cubic meters per second, the sediment is all suspended and will be washed away with the water flow and will not stay in the river. Bai Bingnan said that of the total storage capacity of 3.276 billion cubic meters of the Dongzhuang Water Conservancy Project, 2.053 billion cubic meters are used to hold sand back.
The interview team is interviewing.
Through the use of the method of "discharging large and retaining small sediment and discharging sand in a timely manner", the Dongzhuang Water Conservancy Project has been put into operation for 50 years, which can reduce 3.051 billion tons of sediment into the Weihe River, reduce the sediment accumulation in the lower reaches of the Weihe River by 657 million tons, reduce the cumulative siltation thickness of the lower reaches of the Weihe River from 2.6 meters to 0.76 meters, maintain the standard of flood defense in the lower reaches of the Weihe River for at least 38 years, reduce about 2.5 billion tons of sediment into the Yellow River, and reduce the sediment accumulation in the lower reaches of the Yellow River by about 1 billion tons, and the effect of dredging reduction is significant.
"By impounding floodwaters, diverting water and sediment, the flood control standard in the lower reaches of the Jing River has been raised from once in 10 years to once in 20 years, and the flood in the Wei River once in 100 years has been reduced to once in 50 years. Ensure the flood prevention safety of nearly 1.5 million people and 800,000 mu of cultivated land in 9 counties and districts of 3 cities and districts of Xi'an, Xianyang and Weinan, and effectively solve the problem of siltation and flood disasters in the Wei River, so that the phenomenon of 'small water and major disasters' in the lower reaches of the Wei River will no longer exist. Bai Bingnan said.
The construction site of the Dongzhuang Water Conservancy Project is in full swing.
In addition, the Dongzhuang Water Conservancy Project can not only "quench the thirst" of Guanzhong, but also generate electricity for the whole province. The reporter learned that the average water supply of the Dongzhuang Water Conservancy Project for many years is 435 million cubic meters, of which 273 million cubic meters are supplied to the Jinghui Canal irrigation area, which increases the irrigation guarantee rate from 30% to 50%; 162 million cubic meters of domestic and industrial water will be supplied to Tongchuan New Area, Fuping County and Industrial Park, Xixian New Area and Sanyuan County, with a water supply guarantee rate of 95%.
"The installed capacity of the power station is 110,000 kilowatts, and the average annual power generation is 285 million kWh. It can reduce coal consumption by 90,000 tons and carbon dioxide emissions by 250,000 tons per year, contributing to 'carbon peak and carbon neutrality'. Bai Bingnan said.
While providing the water required by the national economy, the Dongzhuang Water Conservancy Project also reserves a certain amount of ecological flow in the river, which can effectively improve the ecological impact caused by insufficient ecological flow and broken flow, and greatly improve the ecological environment of the river during the fish breeding period and the ecological environment of the river in the downstream flood season.
Jinghe Bridge, a water conservancy hub in Dongzhuang, is under construction.
According to reports, under the current conditions, the number of days in the lower reaches of the Jing River that is less than 5.33 cubic meters per second of ecological baseflow is an average of 124 days for many years. After the operation of the Dongzhuang Water Conservancy Project, the daily flow of the whole year is greater than the ecological base flow by 5.33 cubic meters, ensuring that the lower reaches of the Jinghe River continue to flow and the Jingwei wetland does not shrink or degrade.
The discharge flow during the ecologically sensitive period is not less than 10.66 cubic meters per second, and the discharge flow during the flood season is not less than 15.99 cubic meters per year, which plays an important role in improving the river ecological environment during the fish breeding period and the river ecological environment in the downstream flood season.
"The 97-kilometer-long, 73,000-mu water surface formed in the reservoir area will greatly improve the ecological environment of the Jingwei River Basin, making the sky bluer, the mountains greener, and the water clearer." Bai Bingnan said.