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中文摘要：
为了把握洪水泥沙过程对黄河下游游荡型河段河床冲淤调整的影响,通过平面二维水沙数值模拟与实测资料分析,进行了不同水沙过程下黄河下游河道冲淤规律的探讨。研究发现不同洪水泥沙过程对河槽的调整塑造有明显不同的影响,大洪峰流量塑造的河槽在非洪峰期难以维持原有输沙强度。主槽累积刷槽效应与洪水泥沙过程有很好的响应关系,塑造出最适宜河床断面形态的洪水过程才能实现最佳输沙效率。在不同量级漫滩洪水条件中,对应洪峰6 000m^3/s的洪水过程,塑造的断面形态具有最大累积刷槽效应,故可采用其作为黄河下游漫滩洪水的调控指标。
英文摘要：
In order to clarify the influence of flood - sediment process on the channel morphology in wandering reach of the Lower Yellow River, the scouringsihing characteristics under different flood- sediment processes have been inquired by the methods of 2 - D water- sediment numerical simulation and measured data analysis. It is shown that different flood-sediment processes have significantly different effects on shaping the main channel, and the channel molded by the big flood peak can hardly maintain the original intensity of the sediment transportation during non - peak flood periods. The cumulative scouring effects of the main channel have good response to the flood- sediment process, and the flood process can realize the best efficiency of the sediment transport by forming the most appropriate cross - section morphology of the channel. Among various magnitudes of the overbank flood processes, only the process （ Qmax= 6 000 m^3/s） can obtain the best cumulative scouring efficiency by shaping the proper cross-section morphology. Therefore, the corresponding discharge can be considered as a regulation indicator of the overbank floods in the Lower Yellow River.
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