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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Use geopedological methods for the evaluation of sedimentation rates on river floodplains, southern Quebec, Canada.
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Use geopedological methods for the evaluation of sedimentation rates on river floodplains, southern Quebec, Canada.

机译：使用地理学方法评估加拿大魁北克省南部洪泛区的沉积速率。

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This article pertains to the fluvial dynamics of rivers in southern Quebec, in particular to the aggradation and pedogenetic processes observed in floodplains affected by periodic floods. The frequency of flood events, notably along the Saint-Francois River and its main tributaries, leads to fine materials being frequently deposited on floodplains and affected development of alluvial soils. Particle size and physical and chemical analyses have led to a better understanding of the dynamics involved in the formation of floodplains and the development of soils related to this fluvial environment. Also, sedimentological analyses (layer texture and thickness, microstructure) combined with radiocarbon dating (14C) and isotopic methods (210Pb, 226Rd) enabled the determination of sedimentation rates along the floodplains. The radiocarbon dating results obtained from the organic layers buried in alluvial soils show relatively variable ages, i.e. between 2210+or-60 and 30+or-70 years BP. The data gathered reveal an active overbank deposition, which shows evidence of the high flood recurrence in many rivers of the basin. It is estimated that the annual floodplain aggradation ranges from 1.0 to 7.6 mm yr-1 on average, which causes increases in floodplain elevations (vertical accretion). The sedimentation rates obtained using the constant rate supply dating model (210Pb) show average values that range from 2.1 to 10.7 mm yr-1. Also, the presence of contaminated layers at the lower level (>100 cm) of the floodplains suggested an active sedimentation rates along the rivers affected by floods.
机译：本文涉及魁北克南部河流的河流动力学，特别是在受周期性洪灾影响的洪泛区中观察到的积水和成岩过程。洪水事件的发生频率，特别是沿着圣弗朗索瓦河及其主要支流的洪水，导致细粒物质经常沉积在洪泛区上，并影响了冲积土的发育。粒度和理化分析已使人们更好地了解了泛滥平原的形成和与这种河流环境有关的土壤发展所涉及的动力学。此外，沉积学分析（层质地和厚度，微观结构）与放射性碳测年（14C）和同位素方法（210Pb，226Rd）相结合，能够确定沿洪泛区的沉积速率。从埋在冲积土壤中的有机层获得的放射性碳测年结果显示出相对可变的年龄，即BP在2210+或-60到30+或-70年之间。收集到的数据表明活跃的堤岸沉积，这表明流域许多河流高发洪水。据估计，洪泛区的年平均沉积量范围为1.0至7.6 mm yr-1，这导致洪泛区高程增加（垂直积聚）。使用恒速补给定年模型（210Pb）获得的沉降速率显示出2.1到10.7 mm yr-1的平均值。此外，在洪泛区较低层（> 100厘米）存在受污染层，这表明受洪水影响的河流沿岸沉积速率很高。

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