海底边界层沉积物再悬浮的研究进展

发布时间：2018-06-21 10:48

本文选题：海底边界层 + 沉积物再悬浮　；参考：《海洋地质与第四纪地质》2016年01期

【摘要】：海床沉积物受海洋水体的影响形成海底边界层(Bottom Boundary Layers,BBLs)。上部海水与下部沉积物在BBLs发生着复杂的相互作用,直接影响海底沉积物侵蚀、再悬浮与堆积过程。与此同时,沉积物颗粒可能携带的污染物解析释放,BBLs研究的科学意义与工程应用价值日益突显。海底边界层的范围已经远远超出了传统的流体力学中边界层的范围,而是海床界面上下一定范围内,水流与海床相互作用的区域。在波浪作用下BBLs沉积物以海床剪切破坏、海床液化破坏及震荡体破坏三种破坏模式发生侵蚀再悬浮。此外,海流、风暴潮、人类活动以及海底生物的扰动作用等对沉积物再悬浮起着不可忽视的作用。BBLs沉积物再悬浮原位观测是研究BBLs沉积物再悬浮最基础也是最重要的手段之一,常用的原位测试手段有水体采样、OBS、激光粒度仪、ADCP/ADV以及电法测量。海底悬沙和底沙的交换程度直接影响底层悬沙浓度的变化,沉积物再悬浮的定量分析成为海洋沉积过程研究的主要内容之一。系统地总结前人的研究成果,重点围绕海底边界层理论、海底沉积物再悬浮的影响因素、沉积物再悬浮的原位观测以及海底沉积物再悬浮的定量分析等几个问题进行综合评述。
[Abstract]:The bottom boundary layer (bottom boundary layer) is formed by the influence of ocean bodies on the seabed sediments. There is a complex interaction between the upper seawater and the lower sediments in BBLs, which directly affects the process of sediment erosion, resuspension and accumulation. At the same time, the scientific significance and engineering application value of the analytical release of BBLs from sediment particles are increasingly prominent. The range of seafloor boundary layer is far beyond the traditional boundary layer in hydrodynamics, but it is the area where the interaction between the current and the seabed is within a certain range of the interface between the seabed and the seabed. Under the action of wave, the three failure modes of BBLs sediment, I. E. shear failure of seabed, liquefaction of seabed and destruction of oscillating body, occur erosion and resuspension. In addition, currents, storm surges, human activities and the disturbance of benthic organisms play an important role in sediment resuspension. In situ observation of BBLs sediment resuspension is one of the most basic and important methods for studying BBLs sediment resuspension. OBSs, ADCP / ADV and electrical measurement are commonly used in in-situ measurement. The exchange degree between suspended sediment and bottom sediment directly affects the change of suspended sediment concentration, and the quantitative analysis of sediment resuspension becomes one of the main contents of marine sediment research. This paper systematically summarizes the previous research results, focusing on the theory of seafloor boundary layer, the influencing factors of sediment resuspension, the in-situ observation of sediment resuspension and the quantitative analysis of seafloor resuspension.
【作者单位】：中国海洋大学环境科学与工程学院;教育部海洋环境与生态重点实验室;
【基金】：国家自然科学基金重点项目(41427803、41372287、41402253) 国家海洋公益行业专业项目(201405032)
【分类号】：P736.21

【相似文献】