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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Seabed erosion and deposition related to the typhoon activity of the past millennium on the southeast coast of China
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Seabed erosion and deposition related to the typhoon activity of the past millennium on the southeast coast of China

机译：与中国东南沿海的过去千年的台风活动有关的海底侵蚀和沉积

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摘要

Catastrophic events often interrupt long-term Earth surface processes. In coastal areas, although millennial-scale trends of climatic and sea-level changes determine the trajectory of sedimentary landform evolution, storm and/or tsunami activity can cause abrupt changes in depositional conditions that may alter the long-term sedimentary processes. Here, we report a sedimentary hiatus that is widely observed from the late Holocene sedimentary sequence at the seabed along the southeast China coast. This hiatus was discovered by close temporal sedimentary and radiocarbon dating analyses of a seabed sedimentary sequence in the mouth area of the Pearl River estuary. The results suggest that a couple of metres in the middle to late Holocene sediment at the seabed were eroded by a catastrophic event happening c. 1000-800 cal. Years BP. In theory, a mega-tsunami generated from the Manila Trench could have caused such erosion at the seabed, but there is a lack of direct geological and historical evidence to support such a hypothesis. Much more likely, a super-typhoon struck the coast and caused the erosion. This hypothesis is strongly supported by the region's historical and geological records, which suggest a period characteristic of intense typhoons ranging from the Medieval Warm Period to the climate transition phase (c. 1000-600 cal. Years BP). During the subsequent Little Ice Age, deposition of sandy sediment continued, suggesting frequent but weaker typhoon activity. Over the past two centuries the deposition of sandy sediment and gravels began, implying the beginning of a phase of intensifying typhoon conditions, possibly a result of the recent warming climate. (c) 2020 John Wiley & Sons, Ltd.
机译：灾难性事件通常会中断长期地球表面过程。在沿海地区，虽然千禧一代的气候和海平变化趋势决定了沉积地貌演变的轨迹，风暴和/或海啸活动可能导致沉积条件的突然变化，可能会改变长期沉积过程。在这里，我们报告了一种沉积的中断，从沿着中国东南海岸海底的晚全新世沉积序列广泛观察。这种中断是通过珠江河口口腔区域海底沉积序列的密闭时间沉积和辐射碳淤积分析来发现。结果表明，海底中间到后期全茂沉积物中的几米被发生的灾难性事件侵蚀。 1000-800 cal。年博士从理论上讲，从马尼拉沟渠产生的巨型海啸可能会导致海底侵蚀，但缺乏直接的地质和历史证据来支持这一假设。更有可能，超级台风袭击了海岸并导致侵蚀。该地区的历史和地质记录强烈支持这一假设，这表明了从中世纪温暖时期到气候转型期的强烈台风的时期特征（C. 1000-600 Cal.年BP）。在随后的小冰河时代，伴随着砂土沉积物的依次依次沉积，表明频繁但较弱的台风活动。在过去的两个世纪里，桑迪沉积物和砾石的沉积开始，暗示了强化台风条件的阶段的开始，可能是最近的变暖气候的结果。 （c）2020 John Wiley＆Sons，Ltd。

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