Core Viewpoint - The Yellow River's water and sediment regulation officially commenced on June 23, with an expected total sediment discharge of 100 million tons by July 9, aimed at addressing sediment accumulation issues in the river [1][3]. Group 1: Water and Sediment Regulation Process - The Yellow River has an average annual sediment transport of 1.6 billion tons, making it the river with the highest sediment content in the world [4][6]. - The regulation process involves artificially creating flood peaks to flush sediment downstream, utilizing reservoir capacity to manage water flow [6][8]. - The current phase started on June 23, focusing on discharging large volumes of clear water to maintain the downstream river's flow capacity [8]. Group 2: Historical Context and Achievements - Since 2002, the Yellow River has undergone 29 sediment regulation operations, resulting in a significant reduction of the riverbed by an average of 3.1 meters [10]. - The cumulative sediment transported to the sea since the initiation of these operations has reached 3.5 billion tons, enhancing the river's flood and sediment transport capacity from less than 1,800 cubic meters per second to approximately 5,000 cubic meters per second [10].