Sediment Transport and Diffusion in the Yellow River Estuary in 2018 Based on Numerical Analysis

Abstract As the river with the highest sediment concentration in the world, the Yellow River carries a huge amount of sediment in the Yellow River estuary every year. The Yellow River estuary extends and forms a forward extension zone of land-sea interaction. It is of great significance to fully understand the movement and diffusion law of the sediment from the Yellow River to the sea and keep the balance of scouring and silting. A two-dimensional mathematical model from Luokou to the Yellow River estuary and Bohai Bay was established, and the diffusion law of sediment movement in the Yellow River flood and dry season was obtained by simulation calculation. The influencing factors of sediment movement and diffusion mainly include flood magnitude, sea level tide fluctuation and tidal current direction. The analysis of the movement range and diffusion rate of sediment under different conditions provides a reference basis for the control of the sand bar in the Yellow River estuary and the balance of scouring and silting in the lower reaches of the Yellow River.