海底热液羽流发展过程的数值模拟  

Simulation study on hydrothermal plume transport in a stratified background

作　　者：易卫龙 刘欢[2] 叶丰[1] 包芸[2] 

机构地区：[1]中山大学工学院力学系,广州510275 [2]中山大学海洋科学学院,广州510275

出　　处：《科技导报》2017年第3期81-85,共5页Science & Technology Review

基　　金：国家自然科学基金项目(11372362)

摘　　要：海底热液羽流系统对海洋底部热量与物质输运等科学问题的研究具有重要意义。本文采用数值模拟的方法研究在温度层结环境中二维轴对称热液羽流的发展过程,讨论热液羽流不同喷口条件对羽流发展过程的影响。计算结果表明,热液羽流的喷发过程分为2个阶段:上升过程中温度逐渐降低浮力减小,在背景层结的作用下达到稳定的上升高度;其后羽流顶部转向横向输运。喷口温度、喷口半径对热液羽流的上升高度和横向输运能力的影响正相关。The seafloor hydrothermal system plays an important role in exchanging both thermal energy and chemical components between the ocean and earth crust. The hydrothermal system in a temperature stratified background is simulated using an axisymmetric model, and the influences of spout temperature, spout radius, spout flow velocity are discussed. The results show that the temperature decreases because the plume continues to entrain fluid, the plume overshoots to the maximum plume rise height in the stratified environment eventually. Over time, a laterally spreading intrusion develops above the plume and the plume＇s transport range at the bottom still remains unchanged. The spout temperature and spout radius have positive correlations with the rise height and lateral range of the hydrothermal plume.

关 键 词：热液羽流 物质输运 横向传播半径 数值模拟 

分 类 号：P736[天文地球—海洋地质]