基于声传播损失的南海海域地声参数敏感性分析  

Sensitivity Analysis of Geo-Acoustic Parameters in the South China Sea Based on Acoustic Transmission Loss

作　　者：李润 杨春梅 宋鹏[5] 李官保 刘宗伟 姜莹 吕连港 LI Run;YANG Chunmei;SONG Peng;LI Guanbao;LIU Zongwei;JIANG Ying;LÜLiangang(First Institute of Oceanography,MNR,Qingdao 266061,China;Key Laboratory of Marine Science and Numerical Modeling,MNR,Qingdao 266061,China;Shandong Key Laboratory of Marine Science and Numerical Modeling,Qingdao 266061,China;Laboratory for Regional Oceanography and Numerical Modeling,Laoshan Laboratory,Qingdao 266237,China;College of Marine Geosciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061 [2]自然资源部海洋环境科学与数值模拟重点实验室,山东青岛266061 [3]山东省海洋环境科学与数值模拟重点实验室,山东青岛266061 [4]崂山实验室区域海洋动力学与数值模拟功能实验室,山东青岛266237 [5]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《海洋科学进展》2024年第3期590-601,共12页Advances in Marine Science

基　　金：崂山实验室科技创新项目(LSKJ202204800);国家自然科学基金项目(42206195)

摘　　要：以中国南海地声-水声联合调查实验数据为基础,利用多道地震数据偏移成像以及浅地层剖面数据反演获取了一个分层地声模型。通过设定该模型各层地声参数的参考值和变化区间,结合实测的水体声学参数,利用Krakenc耦合简正波模型计算了不同地声参数下的声传播损失;分析了理论与实测声传播损失均方根误差随地声参数的变化规律以及均方根误差的区间分布情况。研究结果表明:对于频率100 Hz的声传播,地声模型第一层和第二层沉积层的声速对声传播损失影响最为显著;第一层和第二层沉积层衰减系数、厚度对声场的影响次之;基底对声场的影响最小。本文在接近真实海底的环境下研究了海底各分层结构中地声参数对声场的影响,可为建立海洋环境地声模型提供一定的依据。Based on the experimental data of a joint geo-acoustic and underwater-acoustic investigation in the South China Sea,this study obtained a layered geo-acoustic model by using migration imaging of multi-channel seismic data and inversion of sub-bottom profile data,and established the reference values and variation intervals of the model.Combined with the measured acoustic parameters in water,this study calculated the sound transmission loss by using the Krakenc coupled mode model for various geo-acoustic parameters,and conducted an analysis on the variation of the root mean square error with respect to the geo-acoustic parameters and the distribution of this error.The results showed that for 100 Hz sound source,the sound velocity of the first and second layers in the geo-acoustic model has a significant impact on transmission loss,exhibiting the strongest parameter sensitivity,while the attenuation coefficients and thickness of both layers have a secondary impact on transmission loss.The substrate has a minimal influence on the sound transmission loss.This study studied the influence of geo-acoustic parameters on the sound field in the layered structure of the seabed under an environment close to the real seabed,which provides a basis for establishing the geo-acoustic model in the South China Sea.

关 键 词：地声模型 地声参数 耦合简正波 声传播损失 

分 类 号：P733.2[天文地球—物理海洋学]