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题名

Bottom Drag Variations Under Waves and Currents: A Case Study on a Muddy Deposit off the Shandong Peninsula

作者
通讯作者Xu,Jingping
发表日期
2022-07-01
DOI
发表期刊
EISSN
2296-6463
卷号10
摘要
Bottom drag coefficient is one of the key parameters in quantifying shelf hydrodynamics and sediment transport processes. It varies markedly due to dynamic forcing and bed type differences, so a set of empirical values have been used for beds of coarse material where bedforms are often present. In comparison, dramatically fewer such rule-of-thumb values are available for muddy beds. Here, we present results of variations in bottom drag as calculated from in situ measurements by bottom-mounted tripods that were placed across the top of a muddy deposit during two different deployments, one in summer and another in winter. A tidal asymmetry of bottom drag was observed, most likely caused by variations of local bed roughness. For hydrodynamically smooth (Re < 2.3 x 10(5)) flows, computed values of bottom drag coefficient were fairly scattered but still showed an overall decreasing trend with an increase in Reynolds number. The bottom drag coefficient for hydrodynamically rough or transitional flow was typically constant, while the averaged drag coefficient over all observation periods was 1.7 x 10(-3) . Smaller waves (bottom orbital velocity u(b) < 0.1 m/s) had a very limited impact on the bottom drag coefficient. However, with an increase in u(b) , the wave-current interactions can decrease the time-averaged near-bed velocity and enhance turbulent kinetic energy, thus leading to an increase in the drag coefficient.
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语种
英语
学校署名
第一 ; 通讯
资助项目
Key Special Project for Introduced Talents Team of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0210] ; Guangdong Basic and Applied Basic Research Foundation[2021B1515120080] ; National Natural Science Foundation of China (NSFC)[41530966]
WOS研究方向
Geology
WOS类目
Geosciences, Multidisciplinary
WOS记录号
WOS:000828165300001
出版者
Scopus记录号
2-s2.0-85134213168
来源库
Web of Science
引用统计
被引频次[WOS]:2
成果类型期刊论文
条目标识符http://sustech.caswiz.com/handle/2SGJ60CL/356233
专题工学院_海洋科学与工程系
作者单位
1.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,China
第一作者单位海洋科学与工程系
通讯作者单位海洋科学与工程系
第一作者的第一单位海洋科学与工程系
推荐引用方式
GB/T 7714
Qi,Fukang,Liu,Zhiqiang,Xu,Jingping. Bottom Drag Variations Under Waves and Currents: A Case Study on a Muddy Deposit off the Shandong Peninsula[J]. FRONTIERS IN EARTH SCIENCE,2022,10.
APA
Qi,Fukang,Liu,Zhiqiang,&Xu,Jingping.(2022).Bottom Drag Variations Under Waves and Currents: A Case Study on a Muddy Deposit off the Shandong Peninsula.FRONTIERS IN EARTH SCIENCE,10.
MLA
Qi,Fukang,et al."Bottom Drag Variations Under Waves and Currents: A Case Study on a Muddy Deposit off the Shandong Peninsula".FRONTIERS IN EARTH SCIENCE 10(2022).
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