Episodic discharge of coarse sediment in a mountain torrent
Episodic discharge of coarse sediment in a mountain torrent
复制标题
山洪中粗泥沙的间歇性排放
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Warburton
中科院分区：
文献类型：
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作者：
R. Johnson;J. Warburton
对山区溪流中粗泥沙输移的直接观测很少。本文介绍了一个独特的，高分辨率的记录粗泥沙通量从陡峭的，山洪在英国湖区。在急流源头的一个记录雨量计和一个沉积物收集器（14天分辨率）提供了从2001年10月到2005年4月的详细记录。泥沙通量和降雨序列之间的比较表明，在触发粗泥沙输送的降水极端的重要性。通常每年发生一次主要的沉积物排空事件，产生明显的粗沉积物输出。这些事件具有相似的产量，并且具有明显的规律性。被困沉积物的粒度分析表明，供应和耗尽的信号，以及整个沉积物-水流谱过程的差异作用。
Direct observations of coarse sediment transport in mountain streams are rare. This paper describes a unique, high resolution record of coarse sediment flux from a steep, mountain torrent in the English Lake District, UK. A recording raingauge at the head of the torrent and a sediment trap (∼14-day resolution) provide a detailed record which extends from October 2001 to April 2005. Comparison between the sediment flux and rainfall series demonstrates the importance of precipitation extremes in triggering coarse sediment delivery. Typically one major sediment evacuation event occurs each year producing a distinct episodic output of coarse sediment. These events have similar yields and occur with an apparent regularity. Grain-size analysis of trapped sediment suggests a supply and exhaustion signal, and the differential role of processes across the sediment-water flow spectrum.