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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Dynamics of suspended sediment transport and yield in a large agricultural catchment, southwest France
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Dynamics of suspended sediment transport and yield in a large agricultural catchment, southwest France

机译：法国西南部大型农业流域的悬浮泥沙输送和产量动态

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摘要

The dynamics of suspended sediment transport were monitored continuously in a large agricultural catchment in southwest France from January 2007 to March 2009. The objective of this paper is to analyse the temporal variability in suspended sediment transport and yield in that catchment. Analyses were also undertaken to assess the relationships between precipitation, discharge and suspended sediment transport, and to interpret sediment delivery processes using suspended sediment-discharge hysteresis patterns. During the study period, we analysed 17 flood events, with high resolution suspended sediment data derived from continuous turbidity and automatic sampling. The results revealed strong seasonal, annual and inter-annual variability in suspended sediment transport. Sediment was strongly transported during spring, when frequent flood events of high magnitude and intensity occurred. Annual sediment transport in 2007 yielded 16 614 tonnes, representing 15 t km~(-2) (85% of annual load transport during floods for 16% of annual duration), while the 2008 sediment yield was 77 960 tonnes, representing 70 t km~(-2) (95% of annual load transport during floods for 20% of annual duration). Analysis of the relationships between precipitation, discharge and suspended sediment transport showed that there were signifi cant correlations between total precipitation, peak discharge, total water yield, flood intensity and sediment variables during the flood events, but no relationship with antecedent conditions. Flood events were classified in relation to suspended sediment concentration (SSC)-discharge hysteretic loops, complemented with temporal dynamics of SSC-discharge ranges during rising and falling flow. The hysteretic shapes obtained for all flood events refl ected the distribution of probable sediment sources throughout the catchment. Regarding the sediment transport during all flood events, clockwise hysteretic loops represented 68% from river deposited sediments and nearby source areas, anticlockwise 29% from distant source areas, and simultaneity of SSC and discharge 3%.
机译：从2007年1月至2009年3月，在法国西南部的一个大型农业流域，连续监测悬浮泥沙运移的动态。本文的目的是分析该流域悬浮泥沙运移和产量的时变性。还进行了分析，以评估降水，流量和悬浮泥沙输送之间的关系，并使用悬浮泥沙-排放滞后模式解释泥沙输送过程。在研究期间，我们分析了17次洪水事件，并从连续浊度和自动采样中获得了高分辨率的悬浮泥沙数据。结果表明，悬浮泥沙运移具有强烈的季节性，年度和年度间变化。在春季，频繁发生高强度的洪水事件时，泥沙被大量运输。 2007年的年度泥沙输送量为16 614吨，占15 t km〜（-2）（洪水期间年负荷的16％，占年持续时间的16％），而2008年的泥沙产量为77 960吨，占70 t km 〜（-2）（洪水期间年负荷20％的年负荷的95％）。对降水，流量与悬浮泥沙输送之间关系的分析表明，洪水期间总降水量，峰值流量，总产水量，洪水强度和泥沙变量之间存在显着的相关性，但与先决条件无关。洪灾事件根据悬浮泥沙浓度（SSC）-排放量滞后回线进行分类，并在上升和下降流量期间补充SSC-排放量范围的时间动态。在所有洪水事件中获得的迟滞形状反映了整个集水区可能的沉积物来源的分布。关于在所有洪水事件中的泥沙输送，顺时针方向的滞后回线占河流沉积物及其附近源头地区的68％，逆时针方向则占遥远源头地区的29％，SSC和排放量同时出现3％。

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