Identifying storm surge deposits in the muddy intertidal zone of Ena Bay, Central Japan

Identifying storm surge deposits in the muddy intertidal zone of Ena Bay, Central Japan
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识别日本中部惠那湾泥泞潮间带的风暴潮沉积物

DOI:
10.1016/j.margeo.2020.106228
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发表时间:
2020
期刊:
影响因子:
2.9
通讯作者:
T.
T.
中科院分区:
地球科学2区
文献类型:
--
作者:
Kitamura;A.;Yamamoto;Y.;Harada;K.;Toyofuku;T.

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风暴潮和海啸沉积物为那些负责减轻自然灾害对低纬度和中纬度地区沿海低地以及活动边缘沿着的影响的人提供了重要信息。然而,研究这些存款在沿海低地地层变得越来越困难,特别是在居民区,因为广泛的人为干扰。因此,研究人员不得不扩大他们的工作范围,包括海湾沉积物等浅海沉积物,有些人还研究了与最近风暴事件有关的风暴潮沉积物。在这项研究中,我们确定并检查了厚达14 cm的桑迪风暴潮沉积物,这些沉积物是由2017年台风Lan(最低气压915 hPa)沉积的,这是过去60年来最大的风暴,位于日本中部东京大都市南部沿海地区的Ena湾的潮滩沉积物中。我们将这些沉积物与关东地震(8级)引起的小次郎湾潮滩上发现的海啸沉积物(10-50 cm厚)进行了比较。这些差异意味着这种沉积物的厚度是区分潮滩上风暴潮和海啸沉积物的有效标准。
Storm surge and tsunamis deposits provide essential information for those tasked with mitigating the impacts of natural disasters on coastal lowlands in low- and middle-latitude regions and also along active margins. However, studying these deposits in coastal lowland strata is becoming increasingly difficult, particularly in residential regions, because of extensive anthropogenic disturbance. Researchers have therefore had to extend the scope of their work to include shallow marine deposits such as bay sediments, and some have also worked on storm surge deposits related to recent storm events. In this study, we identified and examined sandy storm surge deposits of up to 14 cm thick that were deposited by 2017 Typhoon Lan (lowest pressure of 915 hPa), the largest storm in the past 60 years, within the tidal flat sediments of Ena bay, in the southern coastal area of metropolitan Tokyo, Central Japan. We compared these deposits with the tsunami deposits (10–50 cm thick) found on the tidal flats of Koajiro Bay, near Ena Bay, that resulted from the Kanto earthquake (magnitude ~8). These differences mean that the thickness of such deposits is a valid criterion for distinguishing between storm surge and tsunami deposits on tidal flats.
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