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Using sediment rating parameters to evaluate the changes in sediment transport regimes in the middle Yellow River basin, China

机译：利用泥沙定额参数评价黄河中游地区泥沙输移规律的变化

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This study analyses the changes in sediment transport regimes in the middle Yellow River basin (MYRB) using sediment rating parameters. Daily streamflow and suspended sediment concentration data were collected at 35 hydrological stations from the 1950s to 2016, which can be divided into three periods based on the type and intensity of human activities: the base stage before 1970, the restraining stage from 1971 to 1989, and the restoration stage after 2002. Data within each period were fitted by log-linear sediment rating curves and the sediment rating parameters were utilized to analyse the spatial and temporal variations in sediment transport regimes. The results show that sediment rating parameters are indicative of sediment transport regimes. In the base stage and the restraining stage, the hydrological stations can be categorized into four groups based on their locations on the rating parameter plot. The stations with small drainage basins were characterized by the highest sediment transport regime, followed by those located in the coarse-particle zone, the loess zone, and the mountainous/forest zone. In the restoration stage, the difference in sediment transport regimes between different geomorphic zones became less distinguishable than in previous stages. During the transition from the base stage to the restraining stage, sediment rating parameters showed no significant changes in sediment transport regimes in all four geomorphic groups. During the transition from the restraining stage to the restoration stage, significant changes were observed in the coarse-particle zone and the mountain/forest zone, indicating that the revegetation programme and large reservoirs imposed a stronger influence on sediment transport regimes in these two zones than in the rest of the MYRB. This study provides theoretical support for evaluating sediment transport regimes with sediment rating parameters.
机译：本研究使用泥沙定额参数分析了黄河中游（MYRB）泥沙输送方式的变化。从1950年代到2016年收集了35个水文站的日流量和悬浮物浓度数据，根据人类活动的类型和强度，该数据可分为三个时期：1970年之前的基础阶段，1971年到1989年的抑制阶段，以及2002年之后的恢复阶段。每个时期的数据均采用对数线性沉积物额定值曲线拟合，并利用沉积物额定值参数分析沉积物输送方式的时空变化。结果表明，泥沙定级参数指示了泥沙的输送方式。在基础阶段和约束阶段，可以根据水文站在等级参数图上的位置将其分为四类。流域较小的站点的特征是最高的输沙量，其次是粗颗粒区，黄土区和山区/森林区。在恢复阶段，不同地貌区之间的沉积物输运方式的差异变得比以前的阶段更难以区分。在从基期到约束期的过渡过程中，所有四个地貌组的泥沙定额参数均显示泥沙输送方式没有明显变化。在从约束阶段到恢复阶段的过渡过程中，在粗颗粒区和山区/森林区观察到了显着变化，这表明植被恢复程序和大型水库对这两个区的泥沙输送方式的影响要强于在MYRB的其余部分。这项研究为评估含泥沙等级参数的泥沙输送方式提供了理论支持。

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