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通过物理模型试验并结合数学模型计算分析，研究了小浪底水库拦沙期下游游荡性河段的河床演变问题。主要结果表明：①小浪底水库拦沙期下游河段自上而下将出现不同程度的冲刷，受工程控制较好的河段，河床冲刷以下切为主，而控制较差的河段，河床下切的同时伴随着展宽，塌滩严重。②河床冲刷后使河道排洪能力加大，对河床变化过程的影响显著，河床综合稳定性增大，但河型并未转化。③游荡性河段冲刷期经常出现水流集中持续顶冲坝岸工程的险象。
Through the physical model test combined with the mathematical model calculation and analysis, the river bed evolution of the downstream wandering reaches in the Xiaolangdi Reservoir was studied. The main results show that: ① Xiaolangdi Reservoir downstream of the river will be washed from top to bottom of different levels of erosion, controlled by the project better river, the river bed to wash the following cut-based, and poorly controlled river, the riverbed undercut At the same time with the widening, serious beach collapse. (2) After riverbed flushing, the discharge capacity of the river channel is increased, which has a significant impact on the riverbed change process, and the comprehensive stability of the riverbed increases, but the river type has not been transformed. Â ’¢ wandering period of erosion often appear to focus on the continued flow of top-Chong dam project.