文献类型：期刊文献

中文题名：一种基于内潮动力特征的浅海声速剖面构建新方法

英文题名：A noval method of constructing shallow water sound speed profile based on dynamic characteristic of internal tides

作者：屈科[1,2,3,4];朴胜春[1,2,3];朱凤芹[1,2,3,4]

机构：[1]哈尔滨工程大学,水声技术重点实验室,哈尔滨150001;[2]海洋信息获取与安全工信部重点实验室(哈尔滨工程大学),工业和信息化部,哈尔滨150001;[3]哈尔滨工程大学水声工程学院,哈尔滨150001;[4]广东海洋大学,广东省近海海洋变化与灾害预警重点实验室,湛江524088

年份：2019

卷号：68

期号：12

起止页码：136

中文期刊名：物理学报

外文期刊名：Acta Physica Sinica

收录：SCI-EXPANDED(收录号：WOS:000472505500015)、CSTPCD、、EI(收录号：20193507378734)、北大核心2017、Scopus(收录号：2-s2.0-85071398889)、CSCD2019_2020、WOS、北大核心、CSCD

基金：Project supported by the National Natural Science Foundation of China (Grant No. 41406041), the Natural Science Foundation of Guangdong Province, China (Grant No. 2014A030310256), and the Excellent Young Teachers Program of GDOU, China (Grant No. HDYQ2015010).

语种：中文

中文关键词：声速剖面;声层析;水动力模式基函数;反演

外文关键词：sound speed profile;acousic tomography;hydrodynamic mode bases;inversion

中文摘要：为了降低反演参数空间的维数,常利用正交经验函数(EOF)来构建声速剖面.然而,EOF方法的样本依赖性使之难以用于缺乏现场实测数据的海域.本文提出一种全新的利用历史数据而不依靠现场实时数据即可获得的声速剖面展开基函数.基于水质子流体静力方程和物态方程,推导了在缺乏实时测量的情况下从历史数据获得水动力模式基函数(HMB)的办法.利用WOA13季节平均温盐数据获得代表内潮动力特征的HMB进行分析.较之EOF, HMB及其对应的投影系数与海洋动力特征直接相关并具有明确的物理含义.基于东中国海实验获得的CTD (conductance-temperature-depth)及宽带爆炸声源声信号数据,利用声速剖面重构以及匹配场声层析对HMB进行了分析,并与EOF进行对比研究.结果表明:HMB可以以较好的精度构建浅海声速剖面.在对现场实时测量依赖更小的情况下,基于HMB方法的声场预报及声层析结果与EOF方法一样好.HMB的获取更简单且直接关联海水的物理特性,该方法可在实时测量样本不足的海域有效替代EOF进行海洋动力现象的声学监测.

外文摘要：In order to provide constraint to the number of inversion parameters, sound speed profile is often modeled by empirical orthogonal functions(EOFs). However, the EOF method, which is dependent on the sample data,is often difficult to apply due to insufficient real-time in-situ measurements. In this paper, we present a novel basis for reconstructing the sound speed profile, which can be obtained by using historical data without realtime sample. By deducing the dynamic equations and the state function of water particle, the hydrodynamic mode bases(HMBs) can be calculated from historical data without real-time in-situ measurement, and a method of constructing the sound speed profile is established by using the dynamic characteristics of seawater.The use of the World Ocean Atlas 2013(WOA13) can obtain the seasonal profiles of temperature and salinity,and then the HMB which represents the dynamic characteristic of internal tides is obtained and analyzed.Unlike EOF, the HMB and its projection coefficients are directly related to the sea dynamic features and have a more explicit physical meaning. According to the orthogonality analysis of hydrodynamic mode, the first-order coefficient can be used to describe the depth change of sound speed iso-lines and the second-order coefficient can be used to describe the change of sound speed gradient. Based on the conductance-temperature-depth profiles and broadband data from underwater explosion collected in the East China Sea experiment of the Asian Seas International Acoustic Experiment, the HMB is tested and compared with the EOF in the sound speed profile reconstruction and matched field tomography. The results show that the sound speed profile in shallow water area can be expressed by the HMB with proper precision. By means of the conventional matched field tomography, the valid sound speed profile can also be obtained in the form of HMB coefficients. The result of transmission loss prediction and tomography from HMB are as good as those from EOF, while the HMB has less dependent on real-time in-situ measurement. The HMB is easy to obtain and closely related to the physical characteristics of seawater, it can be used as an efficient alternative to EOF for monitoring the marine dynamic phenomena in sea areas with insufficient real-time in-situ measurement.