不同流速下冰融化率的实验室探究  

Laboratory study of iceberg melting under distinct flow velocity

作　　者：毕瀚文 李一国 罗浩恒 曹勇 陈旭 孟静 BI Han-wen;LI Yi-guo;LUO Hao-heng;CAO Yong;CHEN Xu;Meng Jing(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;National Oceanography Experimental Teaching Demonstration Center,Qingdao 266100,China;Key Laboratory of Physical Oceanography and Frontiers Science Center for Deep Ocean Multispheres and Earth System/Academy of the Future Ocean,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋与大气学院,青岛266100 [2]海洋学国家级实验教学示范中心,青岛266100 [3]中国海洋大学深海圈层与地球系统前沿科学中心/物理海洋教育部重点实验室/中国海洋大学未来海洋学院,青岛266100

出　　处：《水动力学研究与进展（A辑）》2021年第6期798-803,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金面上基金(41776192,4207622)~~。

摘　　要：冰山融化的淡水通量对于大洋环流和全球气候具有重要的作用,但目前冰山融化的动力学机制尚未研究成熟。该文在实验室条件下,通过对冰的融化过程进行测量和分析,研究不同流速对冰侧向和底面融化的影响。利用实验室循环流实验水槽产生不同流速的均匀流,测量冰的侧面和底面的面积变化及冰的质量以反映冰的融化情况,并利用PIV技术测定高流速和低流速下的流场分布。结果表明,背景流的流速对冰的融化存在明显差异,其原因为融水羽流在不同流速下流动性质的差异:低流速下以羽流形式附着,高流速下以涡旋结构分离脱落,混合加速热量交换,引起冰的快速融化。此外,该文发现高流速下底面比侧面融化更快,且底面对流速的反应更灵敏。这是主要由于冰流相互作用导致不同混合机制:冰底流场剪切不稳定性引发强烈的湍混合,而冰后侧流场主要由地形涡导致混合。该文对分析冰在不同流速下的融化有初步认识,并为冰-海模式参数化方案提供一定参考价值。Fresh water flux of iceberg melting plays critical role in ocean circulation and global climate,but the dynamic mechanism of iceberg melting is not well researched.In this paper the effects of distinct flow velocity on ice side and bottom melting are explored by experiment in the laboratory.The laboratory circulating water tank is used to generate uniform flow at different velocity,and ice melting is reflected by the area change of ice and ice mass,and flow field at high and low velocity is measured by PIV technology.The result indicates the influence of the distinct velocity of background flow on the ice melting is discrepant.The reason is that the melt plume adheres in the form of plume at low flow velocity,and separates in the form of vortex structure at high flow velocity to accelerate mixing.Besides,the experiment indicates the melting speed of the ice bottom is faster than that of the ice side at high velocity,and the response of the bottom surface to the velocity is more sensitive.This paper argues that with the interaction of ice and current,the differences of current structure leading to different hybrid mechanism is the main reason.Shear instability at ice bottom causes violent turbulent mixing,and mixing caused topography eddy is the main reason for ice flank melting.This experiment has a preliminary understanding for analysis of ice melting at different flow velocities,and provides a certain reference for the parameterization scheme of ice-sea model.

关 键 词：冰 流 侧融率 底融率 

分 类 号：P731[天文地球—海洋科学]