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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sidewall erosion: Insights from in situ-produced Be-10 concentrations measured on supraglacial clasts (Mont Blanc massif, France)
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Sidewall erosion: Insights from in situ-produced Be-10 concentrations measured on supraglacial clasts (Mont Blanc massif, France)

机译：侧壁侵蚀：在Supraglacial Clasts（Mont Blanc Massif，France）上测量的原位产生的BE-10浓度的见解

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摘要

Sidewall erosion because of rockfalls is one of the most efficient erosional processes in the highest parts of mountain ranges; it is therefore important to quantify sidewall erosion to understand the long-term evolution of mountainous topography. In this study, we analyse how the Be-10 concentration of supraglacial debris can be used to quantify sidewall erosion in a glaciated catchment. We first analyse, in a glaciated catchment, the cascade of processes that move a rock from a rockwall to a supraglacial location and propose a quantitative estimate of the number of rockfalls statistically mixed in a supraglacial sand sample. This model incorporates the size of the rockwall, a power law distribution of the size of the rockfalls and the mean glacial transport velocity. In the case of the Bossons glacier catchment (Mont Blanc massif), the Be-10 concentrations obtained for supraglacial samples vary from 1.97 +/- 0.24 to 23.82 +/- 1.68 x 10(4) atoms g(-1). Our analysis suggests that part of the Be-10 concentration dispersion is related to an insufficient number of amalgamated rockfalls that does not erase the stochastic nature of the sidewall erosion. In the latter case, the concentration of several collected samples is averaged to increase the number of statistically amalgamated rockfalls. Variable and robust Be-10-derived rockwall retreat rates are obtained for three distinct rockfall zones in the Bossons catchment and are 0.19 +/- 0.08 mm year(-1), 0.54 +/- 0.1 mm year(-1) and 1.08 +/- 0.17 mm year(-1). The mean Be-10 retreat rate for the whole catchment (ca. 0.65 mm year(-1)) is close to the present-day erosion rate derived from other methods. (c) 2019 John Wiley & Sons, Ltd.
机译：由于岩石侵蚀的侧壁侵蚀是山脉最高部分中最有效的侵蚀过程之一;因此，重要的是量化侧壁侵蚀以了解山地地形的长期演变。在这项研究中，我们分析了Supraglacial碎片的BE-10浓度如何用于量化冰川集水区中的侧壁腐蚀。我们首先在冰川集水区内分析，将岩石从摇滚墙移动到超普通位置的级联，并提出定量估计在超透透砂样中统计混合的岩石数量。该型号包括Rockwall的大小，是岩石尺寸的动力法分布和平均冰川运输速度。在Bossons冰川集水区（Mont Blanc Massif）的情况下，用于超透析样品获得的BE-10浓度在1.97 +/- 0.24至23.82 +/- 1.68×10（4）原子G（-1）中变化。我们的分析表明，BE-10浓度分散的一部分与不充分的合并岩石数量没有抹去侧壁侵蚀的随机性质有关。在后一种情况下，将几个收集的样品的浓度平均增加，以增加统计学上含糊的岩石的数量。可变和强大的BE-10衍生的Rockwall撤退率为Bossons集水区中的三个不同的岩石区域获得，并且是0.19 +/- 0.08 mm年（-1），0.54 +/- 0.1 mm年（-1）和1.08 + / - 0.17 mm年（-1）。整个集水区的平均值为-10次撤退率（CA.0.65 mm（-1））接近来自其他方法的本日侵蚀率。 （c）2019 John Wiley＆Sons，Ltd。

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