Sediment resuspension of bottom boundary layer under waves and currents

Wen Mingzheng; Chen Tian; Hu Yunzhuang; Li Yong; Shan Hongxian; Jia Yonggang

doi:10.3969/j.issn.0253-4193.2020.03.009

Volume 42 Issue 3

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Wen Mingzheng，Chen Tian，Hu Yunzhuang, et al. Sediment resuspension of bottom boundary layer under waves and currents[J]. Haiyang Xuebao，2020, 42(3)：97–106，doi:10.3969/j.issn.0253−4193.2020.03.009

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Sediment resuspension of bottom boundary layer under waves and currents

doi: 10.3969/j.issn.0253-4193.2020.03.009

Wen Mingzheng^{1, 2
,},
Chen Tian¹,
Hu Yunzhuang²,
Li Yong²,
Shan Hongxian^{1, 3},
Jia Yonggang^{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.
Function Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China

Received Date: 2019-01-14
Rev Recd Date: 2019-05-26

Available Online: 2020-11-18

Publish Date: 2020-03-25

Abstract

Abstract

Resuspension and its distribution of sediment depend upon three interacting components namely the characteristics of the mobile sediment, the bed forms and the forcing hydrodynamics. A good understanding of the process of sediment resuspension is important in sediment transport. In this paper, in-situ measurements of wave, current, and suspended sediment concentration profiles in the marine ranching of Xiangyun Bay were carried out. The vertical distribution characteristics of suspended sediment in the bottom boundary layer under the wave-current action were analyzed. The results show that the resuspension of seabed sediments in the study area is controlled by storm-waves. The bottom shear stress under storm wave is 10−15 times of the critical shear stress of sediment, resuspension of sediment lags behind storm-wave for 2−3 hours. The type of vertical distribution of suspended sediment is "I" under small wave load, the vertical distribution of suspended sediment in the bottom boundary layer presents a power exponential function, which is "L" type under storm-wave. Bedforms evolved with wave and current action, and which affected the resuspension process of sediments. ${u_{*w}}{\rm{/}}{u_{*c}} = 1.00$ can be used as a criterion to distinguish the bedfroms under the dominant control of wave or current. The value of ${u_{*w}}{\rm{/}}{u_{*c}}$ under wave load is higher than that under the dominant control of wave, and the cutoff value between them increased with the increase of wave load.
- bottom boundary layer,
- suspended sediment,
- waves,
- bedform,
- Xiangyun Bay

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References(28)

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