Analysis of Complex Typography Modulating on Internal Wave's Generation and Propagation

复杂海底结构诱导的非线性内波生成与演进分析

¹ School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
² Navy Submarine Academy, Qingdao 266199, China

Received: 1 June 2017

Abstract

We use a non-hydrostatic numerical simulation based on incompressible Navier-Stokes equations to model the generation and evolution of nonlinear internal waves formed as a result of the interaction with double-ridge topography. By employing an analysis on the different-time distribution of density field, related-vorticity field which came from different profile condition of second sill, we can find and quantify the relation between the arriving time and intensity with the second sill parameter such as the depth and extensional factors. The results and progression of the internal wave's generation and propagation show the complexity, and one of the important factors is deriving from the modulating action on the state of the internal waves initial exciting from the first sill. We also present the case of coexist and evolution of "quick wave" and "slow waves". This study to reveal the ocean internal waves generated transmission mechanism is of important value.

摘要

采用非静压近似建立了适应于非线性内波的非静压海洋内波动力学模型，并据此对复杂海底拓扑结构诱导的非线性海洋内波生成与演进进行了模拟计算。通过对配置不同计算条件，给出了2个海脊特征变化时引起的内波密度场分布、相对涡度场分布及内孤立波抵达时间和强度等定量分析结果，为典型内波分析提供了较为准确的数值模拟方法。该研究对于揭示非线性内波生成和传播的规律性具有重要启示作用。