Storm Waves May Be the Source of Some "Tsunami" Coastal Boulder Deposits.
Storm Waves May Be the Source of Some "Tsunami" Coastal Boulder Deposits.
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DOI：
10.1029/2020gl090775
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发表时间：
2021-06-16
影响因子：
5.2
通讯作者：
Dias F
中科院分区：
文献类型：
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作者：
Kennedy AB;Cox R;Dias F
海岸巨石沉积（CBD）提供了有时是岩石海岸线上海浪淹没的唯一特征；近几十年来，生物多样性与运动起始（IoM）分析被反复用作推断古代海啸存在的主要证据。然而，由这些研究推断出的风暴波高度已被证明是非常不准确的，使一些推论受到质疑。这项工作开发了一个无量纲框架，将CBD属性与风暴波的预测和测量联系起来，产生波浪气候和巨石属性之间的数据驱动关系。我们对单个风暴搬运的巨石进行了海拔-密度-大小-内陆距离-波高分析，描绘了风暴波CBD发生的动态空间。将这些新的关系与假定的海啸生物多样性公约进行测试表明，有些关系完全符合风暴事件的能力，这表明，在这个新框架的背景下，一些先前的研究可能会得到有效的重新检验。风暴波形成的海岸巨石沉积的大小、海拔高度和内陆距离都是气候波高的函数，风暴波形成的海岸巨石沉积存在/不存在的地方存在明确的数据范围。一些先前被确定为海啸成因的海岸巨石沉积可能是由风暴波形成的
Coastal boulder deposits (CBD) provide what are sometimes the only remaining signatures of wave inundation on rocky coastlines; in recent decades, CBD combined with initiation of motion (IoM) analyses have repeatedly been used as primary evidence to infer the existence of ancient tsunamis. However, IoM storm wave heights inferred by these studies have been shown to be highly inaccurate, bringing some inferences into question. This work develops a dimensionless framework to relate CBD properties with storm‐wave hindcasts and measurements, producing data‐driven relations between wave climate and boulder properties. We present an elevation‐density‐size‐inland distance‐wave height analysis for individual storm‐transported boulders which delineates the dynamic space where storm‐wave CBD occur. Testing these new relations against presumed tsunami CBD demonstrates that some fall well within the capabilities of storm events, suggesting that some previous studies might be fruitfully reexamined within the context of this new framework. Size, elevation, and distance inland in storm‐wave‐generated coastal boulder deposits are all functions of climatological wave heights Clear data ranges exist where storm wave coastal boulder deposits do/do not exist Some coastal boulder deposits previously identified as having tsunami origin may have been generated by storm waves