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中文摘要：
多沙河流河床冲淤强度大、河势多变。在水面线预测计算时不但要考虑现状河床边界与水流条件,还要考虑未来的河床变化及水位的相应影响,特别是有水库调控的河流下游更是如此。本文阐述了多沙河流水库下游河床演变调整特点,分析了受水库运用影响的河床反馈调整四个阶段与时间节点;深泓点高程调整可以用反映来水来沙及时间等因素的多因子分段函数表征。基于河床反馈调整的边界响应模式,提出了预测年河床边界条件的分时段处理和推求预测年水位流量关系的方法。利用提出的响应模式,进行了黄河小浪底水库下游河段的水面线预测计算。水面线成果较好地反映了河床调整对洪水位的影响,验证比较合理可信。
英文摘要：
In sediment-laden rivers, erosion and siltation intensity of riverbed is great and river regime is variable. To predict water surface profile for a sediment-laden river, especially for the reach downstream of a regulated reservoir, not only the existing riverbed boundary and flow conditions but the future variation in riverbed and its interaction with water level should be considered. This paper discusses the features of riverbed adjustment and evolution in a sediment-laden river downstream of a reservoir and analyzes the four stages of feedback adjustment under influences of reservoir regulation. Adjustment of thalweg elevation could be expressed by a piecewise function that varies with various factors such as runoff, sediment transport, and time. We also describe a method for calculation of stage-discharge relationship and a method of staged treatment of riverbed boundary based on boundary response mode of riverbed feedback adjustment This response mode has been applied to prediction of water surface profile downstream of the Xiaolangdi reservoir, showing the influence of riverbed adjustment on flood level and the accuracy of the present method.
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