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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Floodplain sedimentation rates in an alpine watershed determined by radionuclide techniques
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Floodplain sedimentation rates in an alpine watershed determined by radionuclide techniques

机译：用放射性核素技术确定高寒流域的洪泛区沉积速率

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Vertical profiles of the activities of Cs-137 and Pb-210 were measured on floodplain sediment cores and upland soil cores along the Soda Butte Creek and the Yellowstone River to determine floodplain sedimentation rates. The position of mine tailings from a 1950 impoundment failure was used as a stratigraphic marker to estimate the sedimentation rates and to make comparisons with rates provided by radionuclide-based methods. Mass accumulation (sedimentation) rates calculated from the position of the mine tailings ranged from 0.00 to 0.17 g cm(-2) yr(-1) and were in good agreement with sedimentation rates calculated from the inventories of Cs-137 and Pb-210. Sedimentation rates calculated from the position of the (CS)-C-137 peak generally overestimated the sedimentation rates, probably because of increased downward migration Of (CS)-C-137 caused by the low pH of water moving through the mine tailings or the high permeability of floodplain sediments relative to upland reference soils. This study demonstrates that the Cs-137 and Pb-210 inventory methods for determining sedimentation rates can be applied to an alpine floodplain where sedimentation events are episodic and where orographic effects on precipitation generate strong downstream gradients in the delivery of atmospheric radionuclides. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：在苏打比尤特河和黄石河沿岸的洪泛区沉积物核心和高地土壤核心上测量Cs-137和Pb-210的垂直活动剖面，以确定洪泛区的沉积速率。将1950年蓄水失败后的矿山尾矿位置用作地层标记，以估算沉积速率并与基于放射性核素的方法提供的速率进行比较。根据矿山尾矿的位置计算出的质量累积（沉降）速率为0.00至0.17 g cm（-2）yr（-1），与根据Cs-137和Pb-210的清单计算出的沉降速率非常吻合。从（CS）-C-137峰的位置计算出的沉降速率通常会高估沉降速率，这可能是由于（CS）-C-137的向下迁移增加，这是由于水的pH值低穿过矿山尾矿或通过洪泛区沉积物相对于高地参考土壤具有高渗透性。这项研究表明，用于确定沉积速率的Cs-137和Pb-210清单方法可以应用于高山洪泛区，那里的沉积事件是偶发事件，并且地形对降水的影响会在大气放射性核素的输送中产生强烈的下游梯度。版权所有（c）2007 John Wiley＆Sons，Ltd.

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