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How to utilize the joint operation of reservoir groups to maximize sediment discharge efficiency is a key technical challenge in water and sediment regulation. This paper selected the joint operation of Sanmenxia and Xiaolangdi reservoirs in the period of water and sediment regulation in 2023 as the object, analyzed the water and sediment processes of the two reservoirs under different matching opportunities and matching water levels, and quantified the water and sediment regulation effect under different matching opportunities and matching water levels between the two reservoirs. Although the Sanmenxia Reservoir has a smaller water storage capacity and limited water transfer capacity, by changing the discharge time of the reservoir, the scouring effect of Xiaolangdi Reservoir is quite different. As the matching water level decreases, the amount of erosion in the reservoir area gradually increases. With the delay of the relative discharge time of Sanmenxia Reservoir, the erosion amount in the reservoir area shows a trend of first increasing and then decreasing. [ABSTRACT FROM AUTHOR]

The Yellow River key reservoir projects bear on the big picture. The practices of planning, construction, operation and management of these key reservoir projects promote continually the deepening of the understanding of the governance of the Yellow River. Based on the planning and construction backgrounds of the Sanmenxia Reservoir and the Xiaolangdi Reservoir in the middle reaches of the Yellow River and their operation and management practices, this paper briefly reviewed the progress from practice to cognition to practice and cognition again, as well as the development and evolution of river harnessing thought through it. Based on the problems and challenges faced by the Yellow River management in the new era, this paper suggests to speed up the development of the Guxian key reservoir project. [ABSTRACT FROM AUTHOR]