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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Recent variation in reach-scale bankfull discharge in the Lower Yellow River
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Recent variation in reach-scale bankfull discharge in the Lower Yellow River

机译：黄河下游河岸满溢流量的近期变化

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摘要

Bankfull discharge is a key parameter in the context of river engineering and geomorphology, as an indicator of flood discharge capacity in alluvial rivers, and varying in response to the incoming flow and sediment regimes. Bankfull channel dimensions have significantly adjusted along the Lower Yellow River (LYR) due to recent channel degradation, caused by the operation of the Xiaolangdi Reservoir, which has led to longitudinal variability in cross-sectional bankfull discharges. Therefore, it is more representative to describe the flood discharge capacity of the LYR, using the concept of reach-averaged bankfull discharge. Previous simple mean methods to estimate reach-scale bankfull discharge cannot meet the condition of flow continuity or account for the effect of different spacing between two sections. In this study, a general method to calculate cross-sectional bankfull discharge using the simulated stage-discharge relation is outlined briefly, and an integrated method is then proposed for estimating reach-scale bankfull discharge. The proposed method integrates a geometric mean based on the log-transformation with a weighted average based on the spacing between two consecutive sections, which avoids the shortcomings of previous methods. The post-flood reach-scale bankfull discharges in three different channel-pattern reaches of the LYR were estimated annually during the period from 1999 to 2010 using the proposed method, based on surveyed post-flood profiles at 91 sedimentation sections and the measured hydrological data at seven hydrometric sections. The calculated results indicate that: (i) the estimated reach-scale bankfull discharges can effectively represent the flood discharge capacity of different reaches, with their ranges of variation being less than those of typical cross-sectional bankfull discharges; and (ii) the magnitude of the reach-scale bankfull discharge in each reach can respond well to the accumulative effect of incoming flow and sediment conditions. Finally, empirical relationships for different reaches in the LYR were developed between the reach-scale bankfull discharge and the previous four-year average discharge and incoming sediment coefficient during flood seasons, with relatively high correlation coefficients between them being obtained, and the reach-scale bankfull discharges in different reaches predicted by the delayed response model were also presented for a comparison. These relations for the prediction of reach-scale bankfull discharges were validated using the cross-sectional profiles and hydrological data measured in 2011. Copyright ? 2013 John Wiley & Sons, Ltd.
机译：满溢流量是河流工程和地貌背景下的一个关键参数，它是冲积河流洪水流量的指标，并且会随着流入的流量和泥沙状况而变化。由于小浪底水库的运营导致近期河道退化，导致黄河下游河道的河道尺寸已进行了显着调整，这导致断面河岸流量的纵向变化。因此，使用到达平均河岸满溢流量的概念来描述LYR的洪水流量是更具代表性的。以前的简单的均值方法无法估算水流的满溢流量，不能满足流量连续性的条件，也无法解决两段间距不同的影响。在这项研究中，简要概述了使用模拟的阶段-放电关系计算横断面满溢流量的一般方法，然后提出了一种综合方法来估算到达规模的满溢流量。所提出的方法将基于对数变换的几何平均值与基于两个连续部分之间的间距的加权平均值相结合，避免了先前方法的缺点。根据所调查的91个沉积段的洪水后剖面和实测的水文数据，使用拟议的方法，在1999年至2010年期间，每年估算LYR的三个不同河道型河段的洪水后规模水库满流量。在七个水文部分。计算结果表明：（i）估计的河岸规模满水流量可以有效地代表不同河段的洪水流量，其变化范围小于典型断面满水流量; （ii）每个河段的河岸规模满溢流量的大小可以很好地响应入流和泥沙条件的累积效应。最后，在洪水季节，河口径规模的满溢流量与前四年平均流量和洪水期入泥沙系数之间建立了经验关系，并获得了较高的相关系数。还提出了由延迟响应模型预测的不同河段的堤岸流量，以进行比较。使用2011年测得的剖面图和水文数据验证了这些用于预测河岸满溢流量的关系。 2013 John Wiley＆Sons，Ltd.

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