海底是水圈与岩石圈相互作用的重要边界，海底过程是地球表层系统科学的研究前沿，其中海底地形地貌、深海物理过程与沉积过程三者关系的研究尤为重要。本项目以东沙海域多个测网大量地震海洋学资料和基于多波束的特殊地形地貌发现为基础，以基于地震资料的内孤立波浅化定量分析与海洋混合参数估计方法为手段，重点研究过渡型波，不对称内孤立波、特别是其与海底的接触关系，研究内孤立波演变与海洋混合的关系。以流体动力学数值模拟与地震正演为手段，并通过观测与模拟的综合研究，重点分析波形变形、过渡型波形成、极性反转与波破碎的过程，分析其控制因素，揭秘特殊地形地貌上方的复杂海水层地震相。从而实现内孤立波浅化与海底相互作用的深入研究。研究成果可以深化海底界面过程的认识，推动海洋地球物理、物理海洋学与海洋地质学进一步交叉发展。

The seafloor is an important boundary of the interaction between the hydrosphere and the lithosphere, and the seafloor process is the frontier of the earth's surface system science. It is particularly important to study the relationship among submarine topography and geomorphology, deep-sea physical processes and sedimentary processes. This project is based on a large number of seismic oceanographic data from several surveying networks in Dongsha area of South China Sea and special topographic and geomorphological discoveries based on multi-beam data. The quantitative analysis of internal solitary waves shoaling and the estimation method of ocean mixing parameters based on seismic data are used to study transitional waves, asymmetric internal solitary waves, especially their contact with the seabed, and the relationship between evolution of internal solitary waves and ocean mixing. By means of hydrodynamic numerical simulation and seismic wave forward modeling, and based on the comprehensive study of observation and simulation data, the processes of waveform changes/transitional wave formation, polarity reversal and wave breaking is analyzed, and the controlling factors are analyzed.The study will uncover the secrets of the complex seawater seismic facies above the special topography and geomorphology. Thus, the interaction between internal solitary waves shoaling and the seafloor can be studied further. The research results can deepen the understanding of the seafloor process and promote the further cross-development of marine geophysics, physical oceanography and marine geology.