Wave flume experiments on the contribution of seabed fluidization to sediment resuspension

ZHANG Shaotong; JIA Yonggang; WANG Zhenhao; WEN Mingzheng; LU Fang; ZHANG Yaqi; LIU Xiaolei; SHAN Hongxian

doi:10.1007/s13131-018-1143-2

探索海床液化对沉积物再悬浮贡献的波浪水槽实验

doi: 10.1007/s13131-018-1143-2

1.
山东省海洋环境地质工程重点实验室, 环境科学与工程学院, 中国海洋大学, 青岛 266100, 中国;海洋地质与环境功能实验室, 青岛海洋科学与技术国家实验室, 青岛 266237, 中国
2.
海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 中国海洋大学, 青岛 266100, 中国

基金项目: The National Natural Science Foundation of China under contract Nos 41272316 and 41372287; the Joint Fund of NSFC and Marine Science Research Centers of Shandong Province of China under contract No. U1606401; the Key Research and Development Program of Shandong Province of China under contract No. 2016ZDJS09A03.

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- 收稿日期: 2016-04-21

Wave flume experiments on the contribution of seabed fluidization to sediment resuspension

1.
Key Laboratory of Shandong Province for Marine Environment and Geological Engineering, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Functional Laboratory for Marine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
2.
Key Laboratory of Ministry of Education for Submarine Geosciences and Prospecting Technology, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

摘要

摘要: 通常认为沉积物的再悬浮主要来源于过剩剪切应力对海床表面的逐层侵蚀。虽然许多研究已经注意到波致海床液化在其中的重要性，然而，至今鲜有成果对其进行可靠的定量评估。本文即尝试通过一系列大型波浪水槽实验，初步对其进行量化评估。实验结果表明：在相对波高 (波高水深比) 为 4/20 和6/20的情况下, 黄河三角洲粉质沉积物的液化分别可以贡献52.5% 和 66.8%的再悬浮沉积物, 液化贡献与相对水深呈现正相关；进一步综合前人研究结果对比分析, 构建了用于定量描述液化贡献与相对水深关系的参数化方程。液化主要通过两种机制影响再悬浮过程：(1) 液化后黏聚力的减弱与渗流托举力，导致沉积物抗侵蚀性衰减 (2) 有部分细颗粒沉积物通过液化海床内部的渗流 “泵送” 输运到海床表面。
- 侵蚀 /
- 剪切应力 /
- 渗流 /
- 孔压累积 /
- 细颗粒 /
- 黄河三角洲
Abstract: Sediment resuspension is commonly assumed to be eroded from the seabed surface by an excess bottom shear stress and evolves in layers from the top down. Although considerable investigations have argued the importance of wave-induced seabed fluidization in affecting the sediment resuspension, few studies have been able to reliably evaluate its quantitative contribution till now. Attempt is made to preliminarily quantify the contribution of fluidization to resuspension using a series of large-scale wave flume experiments. The experimental results indicated that fluidization of the sandy silts of the Huanghe Delta account for 52.5% and 66.8% of the total resuspension under model scales of 4/20 and 6/20 (i.e., relative water depth: the ratio of wave height to water depth), respectively. Some previously reported results obtained using the same flume and sediments are also summarized for a contrastive analysis, through which not only the positive correlation is confirmed, but also a parametric equation for depicting the relationship between the contribution of fluidization and the model scale is established. Finally, the contribution of fluidization is attributed to two physical mechanisms: (1) an attenuation of the erosion resistance of fluidized sediments in surface layers due to the disappearing of original cohesion and the uplifting effect resulting from upward seepage flows, and (2) seepage pumping of fines from the interior to the surface of fluidized seabed.
- erosion /
- shear stress /
- seepage flows /
- pore pressure build up /
- fine-grained particles /
- Huanghe Delta

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参考文献(41)

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探索海床液化对沉积物再悬浮贡献的波浪水槽实验

doi: 10.1007/s13131-018-1143-2

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Wave flume experiments on the contribution of seabed fluidization to sediment resuspension

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