黄河汛期调水调沙结束 累计排沙超780亿千克

Core Points - The Yellow River flood season water and sediment regulation has concluded, with a total sediment discharge exceeding 780 billion kilograms [1][2] - The regulation process involved coordinated management of the Xiaolangdi and Sanmenxia reservoirs, initiated on September 8 due to significant rainfall in the middle reaches of the Yellow River [1][2] Group 1: Water and Sediment Regulation - The Yellow River Water Resources Commission announced the end of the flood season water and sediment regulation on September 17, with the Xiaolangdi reservoir discharging at 1500 cubic meters per second [1] - Since 2002, the commission has implemented 31 water and sediment regulation operations, with 15 occurring during flood seasons [1] - The regulation process lasted for 9 days, with the Sanmenxia reservoir discharging a total of 692.1 billion kilograms of sediment and the Xiaolangdi reservoir discharging 88.7 billion kilograms [1][2] Group 2: Reservoir Management - During the regulation, the Sanmenxia reservoir began pre-releasing water at 3000 cubic meters per second from September 7 to facilitate sediment discharge from the Xiaolangdi reservoir [2] - The Xiaolangdi and Xixiaoyuan reservoirs adjusted their discharge flow based on incoming water and sediment discharge to alleviate riverbed sedimentation and ensure downstream flood safety [2] - The discharge flow from the Xiaolangdi reservoir was adjusted multiple times, peaking at 2500 cubic meters per second and later reduced to 2300 cubic meters per second during rainfall events [2]