

FOLLOWUS
1.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
2.Key Laboratory of Coastal Science and Integrated Management, Ministry of Natural Resources, Qingdao 266061, China
3.Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
zhuangcaitian@163.com
yonggang@ouc.edu.cn
Received:08 January 2022,
Published:01 March 2023
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TIAN Zhuangcai,LIU Chao,REN Ziyin,et al.Impact of seepage flow on sediment resuspension by internal solitary waves: parameterization and mechanism[J].Journal of Oceanology and Limnology,2023,41(02):444-457.
Sediment incipient motion is the first step in sediment resuspension. Previous studies ignored the effect of seepage flow on the mobility of sediment particles and simplified the seabed surface as a rigid boundary. A flume experiment was designed to innovatively divide the seabed into two parts to control the dynamic response of the seabed and control the seepage conditions. In the experiment
the seabed sediments and the amplitude of internal solitary waves (ISWs) were changed to compare and analyze the impact of seepage flow on the sediment resuspension by shoaling ISWs. Moreover
parametric research and verification were carried out. Results indicate that seepage flow can greatly influence fine sand
promote sediment resuspension
and increase the amount of suspension by two times on average. However
seepage flow had a little effect on the suspension of clayey silt and sandy silt. Besides
seepage force was added to the traditional gravity
drag force
and uplift force
and the parameterization of threshold starting shear stress of coarse-grained sediments was developed. The results of this parameterization were verified
and seepage force was critical to parameterization. The threshold starting shear stress was reduced by 54.6% after increasing the seepage force. The physical mechanism of this process corresponded to the vertical reciprocating transient seepage in and out the seabed interface caused by the wave-induced transient excess pore water pressure. This quantitative study on seepage flow for shear stress of coarse-grained sediments induced by ISWs is critical to geohazard assessment.
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