首页 | 本学科首页   官方微博 | 高级检索  
     检索      

沉积层声学特性对浅海低频声场分布的影响
引用本文:祝捍皓,朱军,唐骏,张海刚,郑广学.沉积层声学特性对浅海低频声场分布的影响[J].声学学报,2020,45(5):664-674.
作者姓名:祝捍皓  朱军  唐骏  张海刚  郑广学
作者单位:浙江海洋大学海洋科学与技术学院 舟山316022;浙江大学浙江省海洋观测-成像试验区重点实验室 舟山 316021;浙江海洋大学船舶与机电工程学院 舟山316022;挪威科技大学声学研究中心 特隆赫姆7491;哈尔滨工程大学水声工程学院 哈尔滨 150001
基金项目:国家自然科学基金项目(11704337)、国防基础科研计划实验室稳定支持专题项目(JCKYS2020604SSJS011)、浙江省海洋观察-成像试验区重点实验室资助项目(OIT2017OF01)和舟山市科技计划项目(2017C41003)资助
摘    要:已有对浅海低频水声场的讨论多是关注声能量在水体中的分布特性,对水体下沉积层、基底中低频声传播的同步研究相对较少。本文基于波动方程,在柱坐标系下推导了一种浅海水体/海底统一波导下低频声能流的计算模型,在此基础上结合具体仿真算例与波动理论阐述了不同沉积层声学参数对声场能量分布的影响规律及机理。仿真结果表明,在沉积层纵波声速>水中声速>沉积层横波声速的前提下,沉积层中密度与纵波声速数值越大,声能量越趋于保留在水体中而不向海底泄漏,横波声速的影响正好相反;沉积层厚度增加到一定量后,基底对流体层中声传播的影响可近似忽略不计。

收稿时间:2018-07-22
修稿时间:2018-11-20

Effects of sediment acoustic characteristics on low-frequency acoustic field distribution in shallow water
ZHU Hanhao,ZHU Jun,TANG Jun,ZHANG Haigang,ZHENG Guangxue.Effects of sediment acoustic characteristics on low-frequency acoustic field distribution in shallow water[J].Acta Acustica,2020,45(5):664-674.
Authors:ZHU Hanhao  ZHU Jun  TANG Jun  ZHANG Haigang  ZHENG Guangxue
Institution:1 Institute of Marine Science and Technology, Zhejiang Ocean University Zhoushan 316022;2 Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Zhejiang University Zhoushan 316021;3 Institute of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University Zhoushan 316022;4 The Acoustic Group, Nowegian University of Science and Technology Trondheim 7491;5 College of Underwater Acoustic Engineering, Harbin Engineering University Harbin 150001
Abstract:Most existing literatures on low-frequency underwater acoustic propagation in shallow water focus on the acoustic propagation features in the water column,while studies on acoustic propagation features in the sediment layer or the semi-infinite basement are rarely.In this paper,based on the wave equation,a computational model for acoustic energy flux in the sediment layer and the basement as well as in the water column is built under cylindrical coordinates.On this basis,the effects of various sediment acoustic parameters on the acoustic energy distribution and the corresponding mechanisms are elaborated through numerical examples and acoustic theory.The simulation results reveal that,in the situation of sediment P-wave speed > water sound speed > sediment S-wave speed,the greater the values of density and P-wave speed in sediment,the more likely the acoustic energy remains in the water column without leaking to the ocean bottom,while the influence of the variation of S-wave speed is in the opposite way.Basement influence on the acoustic propagation in fluid layer is approximately negligible after the sedimentary layer is thickened to a certain degree. 
Keywords:
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《声学学报》浏览原始摘要信息
点击此处可从《声学学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号