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首页> 外文期刊>Geodinamica Acta >Bed-material mobility in a large river below dams
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Bed-material mobility in a large river below dams

机译：水坝下的一条大河中的底物流动性

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摘要

The mobility of river-bed surface particles is examined in the lower Ebro River downstream from dams that were closed several decades ago. Mobility is analysed by comparing photographs of painted bed areas taken before and after the 2003-2004 flood season, and also by comparing lines of painted particles after the floods. The peak of the maximum flood had a recurrence interval of 2 years. Medium and coarse gravels were widely exported from all the study reach, reflecting a disequilibrium between the competence of the flow to entrain and transport them and the rate of supply from upstream. By contrast, very coarse gravels and larger particles remained immobile, since floods were not competent enough to mobilise them. The partial entrainment of surface particles caused a coarsening of the river-bed surface, even in areas where sediments are loose and the river-bed is highly active during small floods.
机译：在几十年前关闭的水坝下游的埃布罗河下游，检查了河床表面颗粒的流动性。通过比较2003-2004年汛期前后的涂漆床区域照片，以及比较洪水后涂漆颗粒的线条来分析流动性。最大洪水高峰的复发间隔为2年。从所有研究范围广泛地出口了中级和粗级砾石，这反映了夹带和运输这些流的能力与上游供应速率之间的不平衡。相比之下，由于洪水没有足够的能力来动员它们，因此非常粗糙的砾石和较大的颗粒仍然无法移动。即使在沉积物稀疏且小洪水期间河床高度活跃的地区，表面颗粒的部分夹带也会使河床表面变粗。

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