Wave flume experiments on dynamics of the bottom boundary layer in silty seabed

Mingzheng Wen; Yonggang Jia; Zhenhao Wang; Shaotong Zhang; Hongxian Shan

doi:10.1007/s13131-020-1571-7

Volume 39 Issue 5

May 2020

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Mingzheng Wen, Yonggang Jia, Zhenhao Wang, Shaotong Zhang, Hongxian Shan. Wave flume experiments on dynamics of the bottom boundary layer in silty seabed[J]. Acta Oceanologica Sinica, 2020, 39(5): 96-104. doi: 10.1007/s13131-020-1571-7

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Wave flume experiments on dynamics of the bottom boundary layer in silty seabed

doi: 10.1007/s13131-020-1571-7

Mingzheng Wen^{1, 2},
Yonggang Jia^{1, 3
,
,},
Zhenhao Wang^{1, 4},
Shaotong Zhang¹,
Hongxian Shan^{1, 3}

1.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
2.
Tianjin Center, China Geological Survey, Tianjin 300170, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
4.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China

Funds: The National Natural Science Foundation of China under contract Nos 41427803 and 41807229; the Joint Fund of NSFC and Marine Science Research Centers of Shandong Province of China under contract No. U1606401; China Geological Survey Program under contract No. 121201006000182401.

More Information

Corresponding author: E-mail: yonggang@ouc.edu.cn
Received Date: 2019-06-10
Accepted Date: 2019-07-13

Available Online: 2020-12-28

Publish Date: 2020-05-25

Abstract

Abstract

The objectives of this study are carried out a series of controlled large wave flume experiments using fine-grained sediment from the Huanghe River Delta, exploring the complete sequence of sediment behavior in the bottom boundary layer (BBL) during wave-induced liquefaction. The results show that: (1) The BBL in silty seabed is exposed to a progressive wave, goes through a number of different stages including compaction before liquefaction, sediment liquefaction, and compaction after liquefaction, which determines the range and thickness of BBL. (2) With the introduction of waves, first, the sediment surface has settled by an amount S (S=1–2 cm) in the course of wave loadings with an insufficient accumulation of pore water pressure. And a thin high concentration layer formed the near-bed bottom. (3) Once the liquefaction sets in, the liquefied sediment with an ‘orbital motion’ and the sub-liquefied sediment form a two-layer-sediment region. The range of BBL extends downwards and stopped at a certain depth, subsequently, develops upwards with the compaction process. Meanwhile, re-suspended sediments diffuse to the upper water column. (4) During the dynamics process of the BBL beneath progressive waves, the re-suspended sediment increment ranked as sediment liquefaction > erosion before liquefaction > compaction after liquefaction.
- bottom boundary layer,
- suspended sediment concentration,
- liquefaction,
- compaction,
- Yellow River Delta

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References

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