非饱和沙质沉积物中声速特性研究

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• 英文论文题名：Investigation on sound speed in partially water-saturated sandy sediments
• 论文作者：王飞 ; 黄益旺 ; 郑广赢 ; 孙启航
• 英文论文作者：WANG Fei ; HUANG Yi-wang ; ZHENG Guang-ying ; SUN Qi-hang ; Science and Technology on Underwater Acoustic Laboratory ; Harbin Engineering University ; College of Underwater Acoustic Engineering ; Harbin Engineering University
• 年：2016
• 作者机构：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
• 论文关键词：非饱和 ; 声速 ; 沉积物
• 英文论文关键词：partially saturated ; sound speed ; sediment
• 会议召开时间：2016-08-21
• 会议录名称：2016’中国西部声学学术交流会论文集
• 语种：中文
• 分类号：P733.2
• 学会代码：SXJS
• 会议名称：2016’中国西部声学学术交流会
• 会议地点：中国四川成都
• 主办单位：中国声学学会微声学分会、中国声学学会物理声学分会、陕西省声学学会、浙江省声学学会、山东省声学学会、上海市声学学会、黑龙江省声学学会、水声技术重点实验室、重庆市声学学会、西安市声学学会、四川省声学学会
• 学会名称：《声学技术》编辑部
• 页数：4
• 文件大小：1208k
• 原文格式：D
• 会议级别：全国

摘要

为了研究海底非饱和沉积物的声学特性,通过将气体和孔隙水等效为一种流体,用等效流体的密度和体积弹性模量替换等效密度流体模型(EDFM)中孔隙水的密度和体积弹性模量,得到非饱和沉积物模型。仿真分析了气体的体积分数对声速的影响,并在实验室条件下测量了500Hz-1k Hz频带范围内非饱和沙质沉积物的声速。仿真结果表明,气体的存在使得沉积物的声速降低;气体的体积分数越大,声速越低。测量结果验证了气体存在对声速的影响,通过参数拟合,测量结果与模型预报结果大致吻合。
In order to study the acoustic properties of partially gas-saturated sediment, we derived a model that approximates gas and water as a fluid. The density and bulk modulus of the effective fluid are replaced by the density and bulk modulus of the water of the effective density fluid model(EDFM). We simulated the effect of gas content on sound speed and obtained the sound speed in the frequency range of 500Hz-1k Hz under laboratory condition. The simulation results indicate that the presence of gas diminish sound speed. The larger gas content is, the lower sound speed is. The experiment results confirm the effect of gas. And the results in the frequency range agree well with model prediction whose physical parameters are derived from curve fitting.

引文

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    [3]Berryman J G,Thigpen L.Effective constants for wave propagation through partially saturated porous media.Appl.Phys.Lett,1985;46(8):722-724.
    [4]Williams K L,Jackson D R,Thorsos E I,Tang D J,Schock S G.Comparison of Sound Speed and Attenuation Measured in a Sandy Sediment to Predictions Based on the Biot Theory of Porous Media[J].IEEE J.Ocean.Eng.2002;27(3):413-428.