| 粉质土海底边界层动态演化过程波浪水槽实验 |
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| 引用本文： | 文明征,贾永刚,王振豪,张少同,单红仙. 粉质土海底边界层动态演化过程波浪水槽实验[J]. 海洋学报(英文版), 2020, 42(5): 96-104. DOI: 10.1007/s13131-020-1571-7 |
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| 作者姓名： | 文明征 贾永刚 王振豪 张少同 单红仙 |
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| 作者单位： | 中国地质调查局天津地质调查中心, 天津 300170;山东省海洋环境地质工程重点实验室, 中国海洋大学, 山东 青岛, 266100;中国地质调查局天津地质调查中心, 天津 300170;青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 山东 青岛, 266061;中国地质调查局天津地质调查中心, 天津 300170;自然资源部第一海洋研究所, 山东 青岛, 2660061 |
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| 摘 要： | 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, resuspended 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.
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| 关 键 词： | 海底边界层 悬浮泥沙浓度 液化 固结 黄河水下三角洲 |
| 收稿时间： | 2019-06-10 |
Wave flume experiments on dynamics of the bottom boundary layer in silty seabed |
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| Wen Mingzheng,Jia Yonggang,Wang Zhenhao,Zhang Shaotong,Shan Hongxian. Wave flume experiments on dynamics of the bottom boundary layer in silty seabed[J]. Acta Oceanologica Sinica, 2020, 42(5): 96-104. DOI: 10.1007/s13131-020-1571-7 |
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| Authors: | Wen Mingzheng Jia Yonggang Wang Zhenhao Zhang Shaotong Shan Hongxian |
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| Affiliation: | 1.Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China2.Tianjin Center, China Geological Survey, Tianjin 300170, China3.Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China4.First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China |
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| 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. |
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| Keywords: | bottom boundary layer suspended sediment concentration liquefaction compaction Yellow River Delta |
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