General situation of Dongping Lake water conservancy

After the founding of the People's Republic of China, Dongping Lake was treated on a large scale, dikes were built, and Dongping Lake was separated from the Yellow River and the Canal, forming a new and old lake area, which basically realized the "storage, prevention, drainage, flood control and safety" of Dongping Lake hub.

Before the founding of the People's Republic of China, a levee (Old Yellow River levee) was built in Dongping Lake, starting from Shilibao in Liangshan County in the west and ending at Xixiekou in Dongping City in the east. The height and top width of the dam are1~ 2m. 1949, the Yellow River flooded, and the Zhuang people in Liangshan mainland broke out. Yellow water flows back to Dongping Lake and breaks through Yunxi levee, affecting an area of nearly 2,000 square kilometers. However, the flood detention has played a great role in reducing the threat of dikes in the lower reaches of the Yellow River. Therefore, in July 1950, the Yellow River Flood Control Headquarters designated Dongping Lake as the natural flood detention area of the Yellow River as one of the important measures to ensure the safety of the lower reaches of the Yellow River.

1950- 195 1 built Jinxianling levee and new Huang Lin levee, blocked the old Huanglin levee, and repaired Yunxi levee and Yundong levee. The first flood storage and detention area (that is, the old lake area of Dongping Lake) and the second flood storage and detention area will be formed, which will be used in stages according to the flood situation of the Yellow River and Wenhe River. The total area of flood storage and detention area is 943 square kilometers (including the first flood storage and detention area of 223 square kilometers).

1958 After the flood in July, in order to prevent the Yellow River flood, the People's Committee of Shandong Province submitted to the State Council on July 26th the Planning Points and Construction Opinions of Building Dongping Lake Reservoir in Shandong Province in advance to prevent the Yellow River from limiting the flood for 29,000 seconds, and it was approved by the State Council to build Dongping Lake Reservoir in advance. From August 1958 to the end of 1962, the project of changing lakes into reservoirs was completed in five consecutive phases. 76 km of reservoir dikes were built, and 6 1 km of slope protection was built for new lake dikes. Three lake gates, Shilibao, Xuzhuang, Gengshankou and Chenshankou, will be built. After the renovation, Dongping Lake flood storage and detention area will become a plain reservoir with a total area of 632 square kilometers and a total storage capacity of 4 billion cubic meters. In the fifth phase of the lake and reservoir project, 29.23 million cubic meters of earth and stone were completed, with earth and stone1150,000 cubic meters and 27.44 million person-days, with an investment of 39.74 million yuan (excluding resettlement fees and construction fees for entering and leaving the lake gate).

From 65438 to 0963, with the dam-break reconstruction of Weishan junction, Dongping Lake Reservoir resumed the pattern of flood detention and graded operation. After changing the flood detention area, the maximum storage capacity is 3 billion cubic meters. 1963- 1965, repair the secondary lake embankment and stone slope protection. 1966- 1970 comprehensive renovation of embankment slope protection. By the end of 1985, the buildings for entering and leaving the lake have been built for many years, with five gates for entering the lake in Shi Wa, Lin Xin, Shilibao, Xuzhuang and Gengshankou, and two gates for leaving the lake in Chenshankou and Qinghemen.

1950- 1985, Dongping Lake flood storage and detention area project, * * completed 97 million cubic meters of earthwork, 2.78 million cubic meters of stone and 220,000 cubic meters of concrete, with an investment of 230 million yuan.

The control and application principle of Dongping Lake flood storage and detention area is to use it by stages according to the flood process of the Yellow River and Wenzhou to reduce the flood loss caused by flood storage. General floods that do not exceed the safe flow of the lower reaches of the Yellow River are not divided; When in use, according to the flood situation, make the best use of flood detention in the old lake area; When the Yellow River is flooded or the Yellow River and Wenzhou are flooded, the new lake area should be considered for water storage. The new lake area was not used except 1960 trial flood storage. 1On August 2, 982, a flood peak of 15300 cubic meters per second appeared at Huayuankou Station of the Yellow River. The Lin Xin and Shilibao sluices were used to lead the flood to the old lake area, which lasted for 72 hours, with a maximum inflow of 2,400 cubic meters per second and a storage capacity of 400 million cubic meters. After flood diversion, the maximum discharge of Ai Shan is 7430m3 per second, which reduces the flood peak by 28.6%.