Imbricated Coastal Boulder Deposits are Formed by Storm Waves, and Can Preserve a Long-Term Storminess Record
Imbricated Coastal Boulder Deposits are Formed by Storm Waves, and Can Preserve a Long-Term Storminess Record
复制标题
叠瓦状沿海巨石沉积物是由风暴波形成的，可以保存长期的暴风雨记录
DOI：
10.1038/s41598-019-47254-w
复制
发表时间：
2019
影响因子：
4.6
通讯作者：
Jacob Cytrynbaum
中科院分区：
文献类型：
--
作者：
Rónadh Cox;Louise O'Boyle;Jacob Cytrynbaum
海岸巨石沉积物（CBD）是极端波浪事件的档案。它们位于高潮之上，可能包括重达数十吨甚至数百吨的巨型碎屑。但它们代表风暴还是海啸？许多被解释为海啸沉积物的基础上简单的碎屑大小和有关运输的推论，尽管事实上，没有直接的观察记录这些叠瓦状的巨石群和山脊的形成。在这项研究中，我们使用力平衡，动态缩放波槽实验模型风暴波与巨石的相互作用，并表明风暴波可以产生的所有功能的叠瓦状CBD。这意味着即使CBD含有巨大的砾石，也不能用作事实上的海啸指标。相反，CBD应进行评估，以纳入长期风暴分析。
Coastal boulder deposits (CBD) are archives of extreme wave events. They are emplaced well above high tide, and may include megagravel clasts weighing tens or even hundreds of tonnes. But do they represent storms or tsunami? Many are interpreted as tsunami deposits based simply on clast size and inferences about transport, despite the fact that there are no direct observations documenting formation of these inbricated boulder clusters and ridges. In this study, we use force-balanced, dynamically scaled wave-tank experiments to model storm wave interactions with boulders, and show that storm waves can produce all the features of imbricated CBD. This means that CBD, even when containing megagravel, cannot be used as de facto tsunami indicators. On the contrary, CBD should be evaluated for inclusion in long-term storminess analysis.