RIVERSAND: A NEW TOOL FOR EFFICIENT COMPUTATION OF CATCHMENTWIDE EROSION RATES

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Radiocarbon Pub Date : 2023-10-02 DOI:10.1017/rdc.2023.74
Konstanze Stübner, Greg Balco, Nils Schmeisser
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引用次数: 0

Abstract

ABSTRACT In-situ cosmogenic 10 Be (and 26 Al) concentrations in alluvial sediments provide a spatially averaged signal of the erosion rate of the catchment area. Catchmentwide erosion rates reflect the production rate of the entire basin, and their calculation requires knowledge of the complete production rate model. Available calculators determine production rates on a pixel-based approach and achieve computational efficiency by relying on a scaling method that ignores geomagnetic field strength variations. Here we introduce a new python-based tool that determines erosion rates based on the hypsometry of the catchment. The method relies on the fact that production rates are much more sensitive to changes in elevation than latitude. Our tool has two main advantages: (1) computation time is short (<30 seconds) and independent of the scaling method; there is no need to neglect magnetic field variations, and (2) because production rate scaling is performed by a widely used online calculator, the results are fully comparable to exposure ages or point-based erosion rates determined with the same calculator; future updates to production rate scaling are immediately effective for catchmentwide erosion rate calculation. We demonstrate in two case studies that (1) for similar scaling methods, our calculator reproduces pixel-based results within a few percent, and (2) erosion rates determined with different scaling methods may differ by >20%, differences can vary systematically with erosion rate, and using a time-constant scaling method may result in a bias in the interpretation of catchmentwide erosion rates.
河田:一个有效计算流域侵蚀率的新工具
冲积沉积物中的原位宇宙成因10 Be(和26 Al)浓度提供了流域侵蚀速率的空间平均信号。流域侵蚀率反映了整个盆地的产量,其计算需要了解完整的产量模型。现有的计算器根据基于像素的方法确定生产率,并依靠忽略地磁场强度变化的缩放方法来实现计算效率。在这里,我们介绍了一种新的基于蟒蛇的工具,它可以根据集水区的假设来确定侵蚀速率。这种方法基于这样一个事实,即产量对海拔的变化比纬度的变化要敏感得多。我们的工具有两个主要优点:(1)计算时间短(<30秒),与缩放方法无关;没有必要忽略磁场的变化,并且(2)由于生产速率缩放是由广泛使用的在线计算器进行的,因此结果与使用同一计算器确定的暴露年龄或基于点的侵蚀速率完全可比;未来对生产速率尺度的更新对整个流域的侵蚀速率计算立即有效。我们在两个案例研究中证明:(1)对于类似的标度方法,我们的计算器在几个百分点内再现了基于像素的结果;(2)用不同的标度方法确定的侵蚀率可能相差20%,差异可能随着侵蚀率而系统性地变化,使用时间常数标度方法可能导致对流域侵蚀率的解释存在偏差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
审稿时长
6-12 weeks
期刊介绍: Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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