高含沙洪水后黄河下游游荡段宽深比变化规律

发布时间：2018-03-03 23:25

本文选题：高含沙洪水　切入点：河床形态调整　出处：《人民黄河》2016年11期 　论文类型：期刊论文

【摘要】：黄河下游汛期往往会发生含沙量超过300 kg/m3的高含沙洪水,使下游河床形态发生显著调整,研究高含沙洪水后游荡段平滩宽深比变化规律对充分认识下游河床演变特点具有重要意义。选取1970—1999年中13个高含沙洪水年份,以游荡段28个实测断面地形资料为基础,计算了各年汛前及汛后的平滩河槽形态参数,分别从断面及河段尺度分析了高含沙洪水作用下河床形态的调整特点,探讨了汛期水沙条件、汛前河床形态等因素对游荡段平滩宽深比变化的影响。结果表明:汛后宽深比与花园口断面平均输沙率及汛前宽深比关系密切,可用幂函数表示;用2002年及2004年游荡段实测资料验证该幂函数关系式,计算值与实测值吻合较好。
[Abstract]:During flood season of the lower reaches of the Yellow River, high sediment flood with sediment content of more than 300 kg/m3 often occurs, which makes the riverbed shape of the lower reaches obviously adjust. It is important to study the variation law of the width to depth ratio of flat to beach in the wandering section after high sediment flood, which is of great significance to fully understand the evolution characteristics of the downstream river bed. Thirteen flood years with high sediment content in 1970-1999 are selected and based on the topographic data of 28 measured sections in the wandering section. The morphological parameters of Pingtan channel before and after flood season are calculated, and the adjusting characteristics of river bed shape under the action of high sediment flood are analyzed from the scale of section and reach, and the conditions of water and sediment in flood season are discussed. The influence of river bed shape before flood on the ratio of width to depth of flat and beach in wandering section. The results show that the ratio of width to depth is closely related to the average sediment transport rate of Huayuankou section and the ratio of width to depth before flood, which can be expressed by power function. The power function relation is verified by the measured data of the wandering section on 2002 and 2004, and the calculated value is in good agreement with the measured value.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(51379156,51579186) 水利部公益性行业科研专项(201401038)
【分类号】：TV147

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