| Wen Mingzheng,Jia Yonggang,Wang Zhenhao,Zhang Shaotong,Shan Hongxian. 2020. Wave flume experiments on dynamics of the bottom boundary layer in silty seabed. Acta Oceanologica Sinica, 42(5):96－104 |
| Wave flume experiments on dynamics of the bottom boundary layer in silty seabed |
| 粉质土海底边界层动态演化过程波浪水槽实验 |
| Received:June 10, 2019 |
| DOI：10.1007/s13131-020-1571-7 |
| Key words:bottom boundary layer suspended sediment concentration liquefaction compaction Yellow River Delta |
| 中文关键词: 海底边界层 悬浮泥沙浓度 液化 固结 黄河水下三角洲 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Wen Mingzheng | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
Tianjin Center, China Geological Survey, Tianjin 300170, China | | | Jia Yonggang | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | yonggang@ouc.edu.cn | | Wang Zhenhao | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Zhang Shaotong | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China | | | Shan Hongxian | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), 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. |
| 中文摘要: |
| 本文利用黄河水下三角洲粉质土沉积物，通过开展一系列的波浪水槽实验研究，揭示波致液化过程中粉质土海底边界层的动态响应过程。实验结果表明：（1）在波浪作用下，粉质土海底边界层处于动态变化中，边界层内沉积物经历液化前的固结压实、沉积物液化和液化后的再固结过程，沉积物的动态响应决定了海底边界层的范围和厚度；（2）在波浪初始循环荷载下，海床沉积物发生约1-2 cm的沉降，并在边界层表面形成一层薄薄的高浓度层；（3）沉积物发生液化时，液化后的沉积物随波浪荷载做循环“轨道运动”，海底边界层的范围随沉积物液化向下扩展，到一定深度后停止，之后在波浪对沉积物的再固结作用下向上扩展。与此同时，大量的细颗粒沉积物再悬浮至上层水体中形成高浓度悬浮泥沙层；（4）波致海底边界层动态演化过程中，上层水体再悬浮泥沙增量表现为沉积物液化阶段增量>液化前侵蚀再悬浮增量>液化后再固结过程增量。 |
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