Shore platform erosion and cliff retreat in the Eastern Korea: A quantified assessment using 10Be concentrations and numerical modeling

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Ara Jeong , Yeong Bae Seong , Kwang Hee Choi , Zuzanna M. Swirad , Cho-Hee Lee , Byong Yong Yu
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Abstract

Shore platforms, essential for coastal analysis and management, are poorly understood in terms of their long-term evolution, particularly regarding coastal cliff retreat rates and trends, despite their common presence in rocky coastlines. Rock coasts constitute fully erosional environments, yet long-term rates and trends of coastal cliff retreat remain poorly understood. This study adds to the limited number of studies that use cosmogenic isotopes to reconstruct millennial-scale cliff erosion. Cosmogenic 10Be concentrations were measured in 16 rock samples collected across an active 31 m wide granitic Jangsa shore platform in eastern Korea. A geometry-based inverse numerical model was used to simulate 10Be concentrations for various cliff retreat modes, relative sea level curves, and platform downwearing models. The model results were combined with measured concentrations to find the most likely scenario for coastal evolution. Our findings reveal that the shore platform has widened through time and is entirely formed during the Holocene, unlike the previous cosmogenic study in western Korea that attributed the formation of shore platforms to former interglacial periods. The results suggest acceleration in cliff retreat rate from 1.4 mm yr−1 at 7.4 kyr BP to 7.0 mm yr−1 at present. Accelerating cliff erosion may pose a threat to coastal communities, particularly in the context of observed and predicted anthropogenic sea level rise.

韩国东部的海岸平台侵蚀和悬崖后退:利用 10Be 浓度和数值模型进行量化评估
海岸平台对沿岸分析和管理至关重要,但人们对海岸平台的长期演变,特别是海岸崖壁的退缩速率和趋势了解甚少,尽管岩石海岸线中普遍存在海岸平台。岩石海岸是完全侵蚀的环境,但人们对海岸悬崖的长期后退速率和趋势仍然知之甚少。这项研究为利用宇宙生成同位素重建千年尺度悬崖侵蚀的有限研究增添了新的内容。在韩国东部 31 米宽的活跃花岗岩獐子岛海岸平台上采集的 16 个岩石样本中测量了宇宙源 10Be 的浓度。使用基于几何的逆数值模型模拟了各种悬崖退缩模式、相对海平面曲线和平台下穿模型的 10Be 浓度。将模型结果与实测浓度相结合,找到了海岸演变的最可能情况。我们的研究结果表明,海岸平台随着时间的推移而不断扩大,并且完全形成于全新世,这与之前在韩国西部进行的宇宙成因研究将海岸平台的形成归因于前冰期不同。研究结果表明,悬崖后退速度加快,从 7.4 千年前的 1.4 毫米/年-1 到现在的 7.0 毫米/年-1。悬崖侵蚀的加速可能对沿海社区构成威胁,特别是在观测到的和预测的人为海平面上升的背景下。
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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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