Impact of seepage flow on sediment resuspension by internal solitary waves: parameterization and mechanism -- Journal of Oceanology and Limnology,2023,41(2):444-457

	Cite this paper:
	Zhuangcai Tian, Chao Liu, Ziyin Ren, Xiujun Guo, Mingwei Zhang, Xiuhai Wang, Lei Song, Yonggang Jia. Impact of seepage flow on sediment resuspension by internal solitary waves: parameterization and mechanism[J]. Journal of Oceanology and Limnology, 2023, 41(2): 444-457

Impact of seepage flow on sediment resuspension by internal solitary waves: parameterization and mechanism

Zhuangcai Tian^1,2, Chao Liu¹, Ziyin Ren³, Xiujun Guo³, Mingwei Zhang¹, Xiuhai Wang³, Lei Song¹, Yonggang Jia³

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

Abstract:

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.

Key words: internal waves|seepage flow|sediment resuspension|parameterization|mechanism

Received: 2022-01-08 Revised:

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Articles by Zhuangcai Tian

Articles by Chao Liu

Articles by Ziyin Ren

Articles by Xiujun Guo

Articles by Mingwei Zhang

Articles by Xiuhai Wang

Articles by Lei Song

Articles by Yonggang Jia

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