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 , Hui Wang , Chunsheng Ji , Xuezhi Feng , Zhaoyang Tian , 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 (>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 , Hui Wang , Chunsheng Ji , Xuezhi Feng , Zhaoyang Tian , 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 (>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}
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.
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.