利用沿海冲积层中的宇宙成因核素证明千年悬崖缓慢后退的速度

IF 2.8 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Rémi Bossis, Vincent Regard, Sébastien Carretier, Sandrine Choy
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引用次数: 0

摘要

摘要岩石海岸的侵蚀是地质年代全球元素循环的一部分,也是未来可能加剧的主要危害。然而,量化数千年来岩石海岸的退缩率仍是一项挑战,而这一时间跨度包含了相关过程的随机性。具体地说,目前还没有可用的方法来量化千年平均的缓慢海岸侵蚀(1 厘米/年-1)。在这里,我们利用冲积层中的 10Be 浓度(与岩石海岸侵蚀的副产物相对应)来量化当地平均千年的海岸侵蚀速率。我们在东比利牛斯山脉的地中海沿岸(n=8)和秘鲁南部的沙漠沿岸(n=3)检验了这一方法。我们观察到推断的侵蚀率与地貌和气候背景之间存在一致的关系。地中海沿岸的 5 个样本的侵蚀速率相似,均为 0.3-0.5 毫米/年,而位于海角的 1 个样本和来自植被冲积层的 2 个样本的侵蚀速率较低,约为 0.1 毫米/年。较干燥的秘鲁海岸的海岸退缩速率较慢,为 0.05 mm yr-1。虽然这些侵蚀速率的整合期可能包括了全新世以前的时期,在这一时期,海平面和海岸退缩速率都要低得多,但我们在此得出结论,推断海岸退缩速率的相关偏差小于 80%。我们预计,这种量化慢速岩石海岸侵蚀的新方法将填补海岸侵蚀数据库中的一个主要空白,并提高我们对海岸侵蚀因素和危害的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evidence of slow millennial cliff retreat rates using cosmogenic nuclides in coastal colluvium
Abstract. The erosion of rocky coasts contributes to global cycles of elements over geological times and also constitutes a major hazard that may potentially increase in the future. Yet, it remains a challenge to quantify rocky coast retreat rates over millennia; a time span that encompasses the stochasticity of the processes involved. Specifically, there are no available methods that can be used to quantify slow coastal erosion (< 1 cm yr-1) averaged over millennia. Here, we use the 10Be concentration in colluvium, corresponding to the by-product of aerial rocky coast erosion, to quantify the local coastal retreat rate averaged over millennia. We test this approach along the Mediterranean coast of the Eastern Pyrenees (n=8) and the desert coast in Southern Peru (n=3). We observe a consistent relationship between the inferred erosion rates, the geomorphic and climatic contexts. The retreat rates are similar, 0.3–0.5 mm yr-1 for five samples taken on the Mediterranean coast, whereas one sample located on a cape and two samples from a vegetated colluvium have a lower rate of ~0.1 mm yr-1. The coastal retreat rate of the drier Peruvian coast is slower at 0.05 mm yr-1. Although the integration periods of these erosion rates may encompass pre-Holocene times, during which the sea-level and thus the retreat rate were much lower, we conclude here that the associated bias on the inferred retreat rate is less than 80 %. We anticipate that this new method of quantifying slow rocky coastal erosion will fill a major gap in the coastal erosion database and improve our understanding of both coastal erosion factors and hazards.
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来源期刊
Earth Surface Dynamics
Earth Surface Dynamics GEOGRAPHY, PHYSICALGEOSCIENCES, MULTIDISCI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
5.40
自引率
5.90%
发文量
56
审稿时长
20 weeks
期刊介绍: Earth Surface Dynamics (ESurf) is an international scientific journal dedicated to the publication and discussion of high-quality research on the physical, chemical, and biological processes shaping Earth''s surface and their interactions on all scales.
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