小浪底水库运用对黄河下游深泓线演变的影响.

The evolution of alluvial rivers' deep river lines is of great significance to river regimes and river bed landforms. In order to find out the influence of the changing conditions of water and sediment after the completion of Xiaolangdi Reservoir on the evolution of the deep-water line in the lower reaches of the Yellow River, based on the topographical data measured after the flood in Huayuankou, Sunkou and Hongkou sections from 2002 to 2014, the position of the deep-water line in the lower reaches of the Yellow River was compared and analyzed. The changing trend of, and its relationship with the sand-to-sand coefficient. The results show that: from 2002 to 2014, the migration intensity of deep water in Huayuankou section is the largest, followed by Sunkou, and the smallest in Hongkou. The trend of decreasing and then increasing. The turning point occurs when the incoming sediment coefficient is 0.004-0.006. Among the three sections, the migration intensity of Huayuankou Shenhong is the most sensitive to the change of incoming sediment coefficient, and the incoming sediment coefficient in flood season is the most sensitive. The change played a leading role in the change of Shenhong migration intensity. The effect of water storage and sediment retention in Xiaolangdi Reservoir reduces the sediment arrival coefficient in the lower reaches of the Yellow River, which changes the evolution trend of sedimentation and shrinkage in the main channel, and is also conducive to the stability of the mainstream of the river. [ABSTRACT FROM AUTHOR]