长江中下游东流水道河床演变特性及趋势预测

发布时间：2018-11-22 09:59

【摘要】：以东流水道为研究对象,从水流泥沙、河道地形等实测数据出发,分析其河床演变基本特征,着重探讨整治工程实施后地貌出现的新变化,同时结合平面二维数学模型对该河段的发展趋势进行预测。结果表明:整治工程实施后深泓线趋于顺直,且整体存在下摆趋势;东港经历了深泓线下切后进口段已基本稳定,中下段的深泓有所冲深;天玉串沟整体维持冲刷趋势,老虎滩头部冲刷后退,其尾部淤积下延;天沙洲沙头侵蚀后退,尾部基本稳定但面积持续缩减。东流河段的整治工程在2010年汛期前较好地控制了东流河段,整体上达到了整治预期效果。2010年讯后地貌形态出现较大变化,结合平面二维水沙数学模型对该河段未来10 a发展趋势进行预测,分析结果与实测基本吻合。今后应加强整治工程力度,着重维护西港的稳定、控制东港分流比,防治河段出现大幅的冲刷和淤积。
[Abstract]:Based on the measured data of flow and sediment and river channel topography, the basic characteristics of river bed evolution are analyzed, and the new changes of geomorphology after the implementation of the regulation project are emphatically discussed. At the same time, combined with plane two-dimensional mathematical model to predict the development trend of the reach. The results show that after the implementation of the regulation project, the deep Hong line tends to be straight, and there is an overall trend of pendulum, the inlet section of Donggang has been basically stable after the deep Hong line has been cut, and the deep section of the middle and lower section has a deep impact. Tianyuxiangou maintained a scour trend as a whole, Laohutan head scoured and retreated, its tail silt was silted down, and Tiansha sand head eroded and retreated, the tail was basically stable but the area continued to decrease. The regulation project of the Dongliu reach has better controlled the Dongliu reach before the flood season in 2010, and has achieved the expected effect of the regulation on the whole. After 2010, the geomorphology has changed greatly. The development trend of the river in the next 10 years is predicted by using the plane two-dimensional hydro-sediment mathematical model, and the analysis results are in good agreement with the measured data. In the future, it is necessary to strengthen the regulation project, to maintain the stability of the west port, to control the diversion ratio of the east port, and to prevent and control the large scour and siltation of the river reach.
【作者单位】：长江航道局;
【分类号】：U612.3

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