神狐峡谷趾部内潮诱发的再悬浮事件特征及机制

IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN
Cong Hu , Hui Wang , Chunsheng Ji , Xuezhi Feng , Zhaoyang Tian , Yonggang Jia
{"title":"神狐峡谷趾部内潮诱发的再悬浮事件特征及机制","authors":"Cong Hu ,&nbsp;Hui Wang ,&nbsp;Chunsheng Ji ,&nbsp;Xuezhi Feng ,&nbsp;Zhaoyang Tian ,&nbsp;Yonggang Jia","doi":"10.1016/j.apor.2025.104754","DOIUrl":null,"url":null,"abstract":"<div><div>Understanding sediment resuspension in deep-sea (primarily deeper than 1000 m) environments is critical for environmental impact assessments and engineering planning. To investigate these processes, a lander was deployed at a depth of 1405 m at the toe of the Shenhu Canyon in the northern South China Sea. Equipped with sensors measuring near-bottom current velocity, temperature, turbidity, and a digital video camera, the lander recorded six resuspension events. Suspended particulate matter (SPM) concentrations were derived from video analysis, revealing that smaller particles (0.6–6 mm) often dominated in number but contributed less to the total volume compared to larger particles (&gt;10 mm). Analysis of current velocity and temperature variations identified distinct resuspension mechanisms. Two events were triggered by down-slope propagating fronts, likely driven by the oblique propagation of internal tides and flow over a nearby promontory. Four events resulted from up-slope propagating fronts caused by internal tide breaking. Down-slope events exhibited greater intensity than up-slope ones. Wavelet analysis of temperature data revealed sub-inertial frequencies during the resuspension events, associated with a dynamical regime known as the sub-inertial event and internal gravity wave (SIE-IGW) regime. The slope of the canyon is near critical and supercritical, which is also consistent with this regime. This study enhances our understanding of resuspension processes in deep-sea environments, highlighting the interplay between internal tides, seafloor topography, and particle distribution, contributing to improved predictions of sediment dynamics.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"163 ","pages":"Article 104754"},"PeriodicalIF":4.4000,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Characterization and mechanism of resuspension events induced by internal tides at the toe of Shenhu canyon\",\"authors\":\"Cong Hu ,&nbsp;Hui Wang ,&nbsp;Chunsheng Ji ,&nbsp;Xuezhi Feng ,&nbsp;Zhaoyang Tian ,&nbsp;Yonggang Jia\",\"doi\":\"10.1016/j.apor.2025.104754\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Understanding sediment resuspension in deep-sea (primarily deeper than 1000 m) environments is critical for environmental impact assessments and engineering planning. To investigate these processes, a lander was deployed at a depth of 1405 m at the toe of the Shenhu Canyon in the northern South China Sea. Equipped with sensors measuring near-bottom current velocity, temperature, turbidity, and a digital video camera, the lander recorded six resuspension events. Suspended particulate matter (SPM) concentrations were derived from video analysis, revealing that smaller particles (0.6–6 mm) often dominated in number but contributed less to the total volume compared to larger particles (&gt;10 mm). Analysis of current velocity and temperature variations identified distinct resuspension mechanisms. Two events were triggered by down-slope propagating fronts, likely driven by the oblique propagation of internal tides and flow over a nearby promontory. Four events resulted from up-slope propagating fronts caused by internal tide breaking. Down-slope events exhibited greater intensity than up-slope ones. Wavelet analysis of temperature data revealed sub-inertial frequencies during the resuspension events, associated with a dynamical regime known as the sub-inertial event and internal gravity wave (SIE-IGW) regime. The slope of the canyon is near critical and supercritical, which is also consistent with this regime. This study enhances our understanding of resuspension processes in deep-sea environments, highlighting the interplay between internal tides, seafloor topography, and particle distribution, contributing to improved predictions of sediment dynamics.</div></div>\",\"PeriodicalId\":8261,\"journal\":{\"name\":\"Applied Ocean Research\",\"volume\":\"163 \",\"pages\":\"Article 104754\"},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2025-08-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Ocean Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0141118725003402\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, OCEAN\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Ocean Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141118725003402","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, OCEAN","Score":null,"Total":0}
引用次数: 0

摘要

了解深海(主要是深度超过1000米)环境中的沉积物再悬浮对于环境影响评估和工程规划至关重要。为了研究这些过程,一个着陆器被部署在南中国海北部神狐峡谷底部1405米深的地方。着陆器配备了测量近海底流速、温度、浑浊度的传感器和一个数字摄像机,记录了6次再悬浮事件。视频分析得出悬浮颗粒物(SPM)浓度,显示较小的颗粒(0.6-6 mm)通常在数量上占主导地位,但与较大的颗粒(10 mm)相比,它们对总体积的贡献较小。对流速和温度变化的分析确定了不同的再悬浮机制。两个事件是由下坡传播锋面引发的,可能是由内部潮汐的斜传播和附近海角上的水流驱动的。由内部溃潮引起的上坡传播锋导致了四个事件。下坡事件的强度大于上坡事件。温度数据的小波分析揭示了重悬浮事件期间的亚惯性频率,与称为亚惯性事件和内部重力波(SIE-IGW)机制的动力学机制有关。峡谷的坡度接近临界和超临界,也符合这一规律。这项研究增强了我们对深海环境中再悬浮过程的理解,突出了内部潮汐、海底地形和颗粒分布之间的相互作用,有助于改进沉积物动力学的预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization and mechanism of resuspension events induced by internal tides at the toe of Shenhu canyon
Understanding sediment resuspension in deep-sea (primarily deeper than 1000 m) environments is critical for environmental impact assessments and engineering planning. To investigate these processes, a lander was deployed at a depth of 1405 m at the toe of the Shenhu Canyon in the northern South China Sea. Equipped with sensors measuring near-bottom current velocity, temperature, turbidity, and a digital video camera, the lander recorded six resuspension events. Suspended particulate matter (SPM) concentrations were derived from video analysis, revealing that smaller particles (0.6–6 mm) often dominated in number but contributed less to the total volume compared to larger particles (>10 mm). Analysis of current velocity and temperature variations identified distinct resuspension mechanisms. Two events were triggered by down-slope propagating fronts, likely driven by the oblique propagation of internal tides and flow over a nearby promontory. Four events resulted from up-slope propagating fronts caused by internal tide breaking. Down-slope events exhibited greater intensity than up-slope ones. Wavelet analysis of temperature data revealed sub-inertial frequencies during the resuspension events, associated with a dynamical regime known as the sub-inertial event and internal gravity wave (SIE-IGW) regime. The slope of the canyon is near critical and supercritical, which is also consistent with this regime. This study enhances our understanding of resuspension processes in deep-sea environments, highlighting the interplay between internal tides, seafloor topography, and particle distribution, contributing to improved predictions of sediment dynamics.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信