越洋海啸中最具威胁性和破坏性波浪通常是由海底山脊引导而至的、速度较慢但能量巨大的波浪成分，它一般出现在由震源直接传播而至的首个海啸波到达后的数小时甚至更晚。这种由于海底山脊对波浪俘获效应而导致海啸波能量聚集并沿其传播的现象对海啸演化变形规律研究有着重要意义。.本项目将从理论上研究海啸波在海底山脊上的运动形式，阐明海脊形状与水深对其运动与传播的影响规律；基于模型实验和数值模拟分别研究海啸在弯曲海脊、不连续海脊及分叉海脊上的传播特性，揭示波浪在非线性、频散性及水深变化联合作用下的长距离演化规律；基于全球海啸模型，模拟研究环太平洋地震带海啸传播过程及其对我国的影响，阐明越洋海啸的传播是“有迹可循”这一重要结论。.本项目研究将拓展波浪在变水深中传播演化理论，为预报越洋海啸中具有破坏性波浪到达时间及危害强度提供理论依据，对提高海啸预报效率及精度有重要学术意义。

The destructive waves in transoceanic tsunamis are not first few waves from the earthquake source region but those of typically higher amplitude, slower waves travelling along ridge topographic waveguides. Such guided waves usually arrive several hours after the first waves or even later. The study of guidance and amplification effect of ocean ridge on water wave has academic value and practical significance on tsunami propagation and disaster prediction..The project will focus on wave motions over oceanic ridges and reveal the effects of ridge shapes and bathymetry on the propagation of such guided waves. Tsunami propagations over curved ridges, discontinuous ridges and furcated ridges are investigated. Long-term evolutions of guided waves with dispersion, nonlinearity and uneven bottom are simulated experimentally and numerically. .The global tsunami model developed in Hohai University is used to investigate impact of tsunamis generated along Pacific Rim on China. We will prove that the path of transoceanic tsunami determined and it propagates along the topographic waveguide.. This research will extend the theory of water wave propagation over uneven bottoms, and provide the theoretical guidance for accurately predicting the arrival time and the magnitude of the most disastrous waves in transoceanic tsunamis. Furthermore, it is meaningful and useful to improve of the efficiency and accuracy of tsunami warning, to enhance the understanding of protection effects of coastal engineering on tsunami disaster.