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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Temporal changes in suspended sediment transport in a gullied loess basin: the lower Chabagou Creek on the Loess Plateau in China
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Temporal changes in suspended sediment transport in a gullied loess basin: the lower Chabagou Creek on the Loess Plateau in China

机译：黄土沟壑区悬沙输送的时空变化：中国黄土高原的Chabagou河下游

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摘要

Suspended sediment dynamics are still imperfectly understood, especially in the loess hilly region on the Loess Plateau, with strong temporal variability, where few studies heretofore have been conducted. Using a dataset up to eight years long in the Lower Chabagou Creek, the variability in suspended sediment load at different temporal scales (within-flood variability, monthly-seasonal and annual) is analyzed in this paper. The results show that, on the within-flood scale, most of the sediment peaks lag behind peak discharges, implying that slope zones are the main sediment source area; independent of the occurring sequences of the peaks of sediment and discharge, all the events could present an anti-clock wise hysteresis loop resulting from the abundant material and the influence of hyperconcentrated flows on suspended sediment concentration. At monthly and seasonal scales, there is a 'store-release' process, i.e. sediment is prepared in winter, spring and late autumn, and exported in summer and early autumn. At the annual scale, the high variability in concentration and sediment yield are highly correlated with water yield, resulting from the number and magnitude of floods recorded yearly, and almost all the suspended load is transported during these events. Copyright (c) 2008 John Wiley & Sons, Ltd.
机译：悬浮的泥沙动力学仍然没有得到很好的理解，特别是在黄土高原的黄土丘陵地区，其时变性很强，迄今很少进行研究。本文使用长达8年的下查巴古河下游的数据集，分析了不同时间尺度上的悬浮泥沙负荷的变化性（洪水内变化性，月度季节和年度）。结果表明，在洪泛区内，大部分沉积物峰均滞后于峰值排放量，这表明斜坡带是主要的沉积物来源区。与沉积物和排放峰的发生顺序无关，所有事件都可能呈现出逆时针方向的磁滞回线，这是由丰富的物质和超浓缩水流对悬浮泥沙浓度的影响引起的。在月度和季节尺度上，有一个``存储释放''过程，即在冬季，春季和深秋准备沉积物，并在夏季和初秋出口。在年尺度上，由于每年记录的洪水的数量和规模，浓度和沉积物产量的高度变化与水的产量高度相关，在这些事件中几乎所有的悬浮物都被运输。版权所有（c）2008 John Wiley＆Sons，Ltd.

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