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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Interpreting erosion rates from cosmogenic radionuclide concentrations measured in rapidly eroding terrain
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Interpreting erosion rates from cosmogenic radionuclide concentrations measured in rapidly eroding terrain

机译：从快速侵蚀地形中测量的富含化学核核素浓度的解释侵蚀率

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摘要

A combination of numerical analysis and Be-10 concentrations measured in sediment samples from the high relief Torrente catchment, southern Spain, allows us to investigate the sampling requirements for determining erosion rates using cosmogenic nuclides in high-relief, landslide-dominated terrain. We use simple modelling to quantify the effect of particle spalling and/or landsliding on erosion rates determined using a cosmogenic in-situ produced isotope. Analytical results show that the cosmogenic nuclide concentration of a surface experiencing regular detachment of a grain or block may be considered to be in steady state, and 'in-situ' erosion rates estimated, when an appropriate number of spatially independent samples are amalgamated. We present equations that enable calculation of the number of bedrock samples that must be amalgamated for the estimation of mean erosion rates on an outcrop experiencing regular detachment of a grain or chip of thickness L every T years. Our findings confirm that mean catchment erosion rates may be reliably estimated from "Be concentrations in fluvial sediment in high-relief rapidly eroding terrain. These catchment-wide integrated erosion rates can be calculated where erosion is primarily accomplished through shallow (< 3 m) spalling processes; where deep-seated (> 3 m) landslides are the dominant mode of erosion only minimum erosion rates can be determined. Lastly, we present erosion rate measurements from the Torrente catchment that reveal variation of two orders of magnitude (0(.)03-1(.)6 m ka(-1)) quantifying the high degree of spatial variation in erosion rates expected within rapidly uplifting catchments. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：在西班牙南部的高浮雕Torrente集水区沉积物样品中测量的数值分析和BE-10浓度的组合使我们能够研究使用高浮雕山脉主导地形中的美容核素来确定侵蚀速率的采样要求。我们使用简单的建模来量化粒子剥落和/或滑坡对使用宇宙原位产生的同位素确定的侵蚀率的影响。分析结果表明，当适当数量的空间独立的样品被合并时，分析结果表明，经历谷物或块正常拆卸的表面的富含核素浓度可能被认为是稳定状态，并且“原位”侵蚀速率估计，当合适数量的空间独立的样品被合并时。我们提出了能够计算必须合并的基岩样本数量的计算，以估计在经历每T年的厚度L晶粒或芯片的晶粒或芯片的露头上的平均腐蚀速率。我们的研究结果证实，可以从“在高浮雕迅速侵蚀地形中的河流沉积物中的浓度”中的平均流量侵蚀率。可以计算这些集水集成侵蚀速率，其中侵蚀主要通过浅（<3米）剥落来完成流程;哪里可以确定侵蚀的损伤模式，只能确定最小的侵蚀率。最后，我们从Torrente集水区呈现腐蚀速率测量，揭示了两个数量级的变化（0（。） 03-1（。）6米ka（-1））量化在快速升高的集水区内的侵蚀率的高度空间变化。版权所有（c）2006年John Wiley＆Sons，Ltd。

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