舟山六横岛海域浅部地层结构与水下滑坡分布特征

doi:10.3969/j.issn.1001-909X.2019.01.008

海洋学研究 ›› 2019, Vol. 37 ›› Issue (1): 59-66.DOI: 10.3969/j.issn.1001-909X.2019.01.008

舟山六横岛海域浅部地层结构与水下滑坡分布特征

孙鸿程, 蔡廷禄, 夏小明, 王欣凯, 刘毅飞

自然资源部第二海洋研究所国家海岛开发与管理研究中心,浙江杭州 310012

收稿日期:2018-09-29 修回日期:2019-01-14 出版日期:2019-03-15 发布日期:2022-11-21
作者简介:孙鸿程(1994-),男,浙江嘉兴市人,主要从事海岛海岸带动力沉积、动力地貌研究。E-mail:sun_9494@163.com
基金资助:
中央级公益性科研院所基本科研业务费专项项目资助(JG1205);国家自然科学基金面上项目资助(41576095)

Distribution characteristics of subaqueous landslides in the sea area of Liuheng Island, Zhoushan

SUN Hong-cheng, CAI Ting-lu, XIA Xiao-ming, WANG Xin-kai, LIU Yi-fei

State Research Center for Island Exploitation and Management,Second Institute of Oceanography, MNR, Hangzhou 310012, China

Received:2018-09-29 Revised:2019-01-14 Online:2019-03-15 Published:2022-11-21

摘要/Abstract

摘要： 舟山群岛海域峡道密布,峡道边坡失稳现象普遍发育,规模不一。多发的水下滑坡对海底光缆、港口码头等海岸工程设施都有较大威胁。2012年12月,使用浅地层剖面仪对六横岛周边峡道区进行探测,划分出3个主要声学反射界面以及4个地层单元,上部3个地层为全新世沉积层。发现6处水下滑坡,分布于六横岛沿岸边坡及毗邻的潮流深槽边坡。滑坡结构均为整体性滑坡,部分具多级性。从滑坡体规模看,滑坡体体积介于1.6×10⁵~2.7×10⁷ m³之间,其中超大型滑坡2处、大型滑坡3处、中型滑坡1处。根据界面与滑坡体的相关性,推测水下滑坡均发生在距今2.5 ka以来的全新世晚期。

关键词: 六横岛, 峡道, 浅部地层结构, 水下滑坡

Abstract: The strait channels are densely covered in the sea area of Zhoushan Islands, and the instability of the slopes of the strait channels is generally developed and varied in scale. The frequent subaqueous landslides pose a greater threat to coastal engineering facilities such as submarine cables and port terminals. In December 2012, the sub-bottom profiles were detected in the sea area of Liuheng Island. Three main acoustic reflection interfaces and four formation units were divided, and the upper three formations were Holocene sedimentary layers. Six subaqueous landslides were found, which were scattered along the coast of Liuheng Island or adjacent to the strait channel slope. The landslides structure were whole landslide, and some of them were multi-step. From the scale of the subaqueous landslides, the volumes were between 1.6×10⁵ to 2.7×10⁷ m³, with 2 super-large landslides, 3 large landslides and 1 medium landslide. According to the correlation between the interface and the landslide body, it was speculated that the subaqueous landslides occurred in the late Holocene since 2.5 ka.

Key words: Liuheng Island, strait channels, shallow stratum structure, subaqueous landslides

中图分类号:

P736.12

孙鸿程, 蔡廷禄, 夏小明, 王欣凯, 刘毅飞. 舟山六横岛海域浅部地层结构与水下滑坡分布特征[J]. 海洋学研究, 2019, 37(1): 59-66.

SUN Hong-cheng, CAI Ting-lu, XIA Xiao-ming, WANG Xin-kai, LIU Yi-fei. Distribution characteristics of subaqueous landslides in the sea area of Liuheng Island, Zhoushan[J]. Journal of Marine Sciences, 2019, 37(1): 59-66.

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舟山六横岛海域浅部地层结构与水下滑坡分布特征

Distribution characteristics of subaqueous landslides in the sea area of Liuheng Island, Zhoushan

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