层结环境中热液羽流物质输运范围的模拟计算*

doi:10.11978/2015142

热带海洋学报 ›› 2016, Vol. 35 ›› Issue (5): 97-102.doi: 10.11978/2015142CSTR: 32234.14.2015142

• 海洋地球物理学 • 上一篇

层结环境中热液羽流物质输运范围的模拟计算^*

叶丰, 包芸

中山大学力学系, 广东广州 510275

收稿日期:2015-11-24 出版日期:2016-08-29 发布日期:2016-09-22
通讯作者: 包芸。Email: stsby@mail.sysu.edu.cn
作者简介:叶丰(1990—), 男, 广东省河源市人, 在读硕士研究生, 研究方向为热液羽流数值模拟。Email: yefeng7@mail2.sysu.edu.cn
基金资助:
基金项目：国家自然科学基金(11372362); 中国科学院战略性先导科技专项(XDA11030302)

Study of hydrothermal plume transport range in a stratified background

YE Feng, BAO Yun

Department of Mechanics, Sun Yet-Sen University, Guangzhou 510275, China

Received:2015-11-24 Online:2016-08-29 Published:2016-09-22
Contact: Corresponding author: BAO Yun. E-mail: stsby@mail.sysu.edu.cn
Supported by:
Foundation item: National Natural Science Foundation of China (11372362); Strategic Priority Research Program of the Chinese Academy of Sciences (XDA11030302)

摘要/Abstract

摘要： 深海热液羽流系统对研究海底岩石圈和海洋之间的热量与物质输运及深海生物活动等科学问题具有重要意义。文章对温度层结环境中的二维轴对称热液羽流进行了数值模拟。计算结果表明, 热液羽流上升过程中温度不断降低, 浮力减小, 在层结作用下达到最大上升高度。羽流垂向速度在羽流中心区域呈柱状分布, 随着高度的增加速度值逐渐减少。计算得到的羽流最大上升高度和底部羽流半径与经典的MTT理论结果进行了对比, 两者基本一致。而后随着时间增加, 热液羽流顶部开始横向输运形成蘑菇状。示踪物浓度反映的羽流半径在高度0~50m保持不变, 50m以上区域羽流最大半径随时间越来越大, 在1.39h时不到30m, 发展到100h后羽流半径达到150m。

关键词: 热液羽流, 物质输运, 横向传播范围, 数值模拟

Abstract: The seafloor hydrothermal system plays an important role in exchanges of both thermal energy and chemical components between the ocean and Earth crust, which has revolutionized our understanding of deep- sea biological processes. The hydrothermal system in the temperature background stratification was simulated by an axisymmetric model. Simulation results showed that because the plume continued to entrain fluid, the temperature decreased, the plume overshot to the maximum plume rise height in the stratified environment eventually. The plume’s vertical velocity decreased as the plume rose in its center area. Our results also suggested that the maximum plume rise height and plume’s radius at the bottom agreed with the MTT theory. Over time, a laterally spreading intrusion developed above 50 m. In 0-50 m, the plume’s radius remained unchanged. At 1.39 hours, the plume’s radius was less than 30 m; at 100.00 hours, it become 150 m.

Key words: hydrothermal plume, species transport, lateral range, numerical simulation

叶丰, 包芸. 层结环境中热液羽流物质输运范围的模拟计算^*[J]. 热带海洋学报, 2016, 35(5): 97-102.

YE Feng, BAO Yun. Study of hydrothermal plume transport range in a stratified background[J]. Journal of Tropical Oceanography, 2016, 35(5): 97-102.

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层结环境中热液羽流物质输运范围的模拟计算^*

Study of hydrothermal plume transport range in a stratified background

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