黄河口清水沟流路滩槽分布特征及稳定阈值分析OA

The stability of the bar-channel system in alluvial estuaries is crucial for flood control safety and ecological protection.Based on the measured cross-section data of the Qingshuigou Course in the Yellow River Estuary from 2000 to 2021,as well as the flow and sediment data of Lijin Station from 2000 to 2023,this study systematically analyzes the morphological distribution characteristics and stability thresholds of the bar-channel in the navigable flowing course.The research results indicate that after the operation of the Xiaolangdi Reservoir,the sharp reduction in sediment inflow has driven the river channel to adjust toward a narrower and deeper pattern.At the 80％confidence level,the average stability threshold of the main channel width in the current Qingshuigou Course is approximately 509 m,and the river channel width threshold is about 7 126 m;the average stability threshold of the maximum water depth in the main channel is approximately 6.4 m,and the threshold of the bar-channel elevation difference is about 3.2 m.In terms of longitudinal variation,the bar-channel morphological change in the Lijin-Yuwa reach is relatively small,with relatively good bar-channel stability;in contrast,the bar-channel morphological change in the Yuwa-Qing 1 reach is relatively large,with relatively poor bar-channel stability.The research results such as the bar-channel thresholds of the Yellow River Estuary can provide a scientific basis for the planning and management of the bar area in the navigable flowing course,as well as wetland ecological protection.