| 内孤立波破碎后对斜坡沉积物的动力作用过程及特性实验研究 |
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| 引用本文： | 李逸冰,刘乐军,周庆杰,惠扬.内孤立波破碎后对斜坡沉积物的动力作用过程及特性实验研究[J].海洋学报,2022,44(8):42-50. |
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| 作者姓名： | 李逸冰 刘乐军 周庆杰 惠扬 |
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| 作者单位： | 1.自然资源部第一海洋研究所 海洋工程环境研究中心，山东 青岛 266061 |
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| 基金项目： | 南海北部白云深水区现代海底峡谷内侵蚀地貌、沉积充填及其对峡谷演化的指示意义项目（41876061）；国家自然科学基金（41506071）。 |
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| 摘 要： | 为完善内孤立波与海底斜坡沉积物相互作用研究，本文着眼于内孤立波破碎后在斜坡上继续运动的阶段，开展物理模拟实验，分析斜坡响应的土压力和超孔隙水压力的变化状况，揭示内波作用过程。研究发现:斜坡沉积物颗粒在内孤立波破碎引起的涡旋和渗流的共同作用下，会发生再悬浮，斜坡坡度变化不改变沉积物产生动力响应的主导动力作用；内孤立波振幅大小影响涡旋与渗流两者的比例，即在小振幅条件下由涡旋作用主导，在大振幅条件下由渗流作用主导；破碎流体在沿斜坡冲出坡顶位置后形成新的涡流，沉积物在新生涡流作用下的动力响应受斜坡坡度的影响。本文结果对于研究内孤立波再悬浮运移海底沉积物、改造海底地形地貌具有参考价值。
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| 关 键 词： | 内孤立波 流速 海底斜坡 动力响应 |
| 收稿时间： | 2021-09-16 |
Experimental study on the dynamic process and characteristics of slope sediments after breaking of internal solitary waves |
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| Institution: | 1.Marine Engineering Environment & Geomatic Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China2.Laboratory of Marine Geology and Geophysics, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China3.Mechanical and Electrical Engineering, China University of Petroleum School (Huadong), Qingdao 266580, China |
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| Abstract: | In order to improve the study of the interaction between internal solitary waves and submarine slope sediments, the stage of continued motion on the slope after internal solitary waves fragmentation is focused on in this paper, and conducts physical simulation experiments to analyse the changes in earth pressure and super-pore water pressure in response to the slope to reveal the process of internal wave action. The results show that the sediment particles on the slope are resuspended under the combined action of vortex and seepage caused by the internal solitary waves fragmentation, and the change in slope gradient does not change the dominant dynamic role of the sediment in generating the dynamic response; the amplitude of the internal solitary waves affect the ratio between vortex and seepage, i.e. the vortex is dominant under small amplitude conditions and the seepage is dominant under large amplitude conditions; the fragmented fluid forms a new dynamic role when it rushes out along the slope. The dynamic response of the sediment to the new vorticity is influenced by the slope of the slope. The results of this paper are useful for the study of internal solitary waves resuspension transporting seafloor sediments and modifying seafloor topography. |
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