海底沉积环境对海底表层沉积物声学参数测量影响研究  

Research on the Influence of Sedimentary Environment on the Acoustic Measurement of the Acoustic Properties of Seafloor Surface Sediment

作　　者：李琦[1] 刘颉[1] 常哲[1] 杨逍[1] 李国富[1] 黄翠[1] LI Qi;LIU Jie;CHANG Zhe;YANG Xiao;LI Guo-fu;HUANG Cui(National Ocean Technology Center,Tianjin 300112,China)

机构地区：[1]国家海洋技术中心,天津300112

出　　处：《海洋技术学报》2020年第4期41-46,共6页Journal of Ocean Technology

基　　金：国家海洋技术中心创新基金重点项目(Z-17005)。

摘　　要：海底表层沉积物声学参数是决定海洋声场环境的关键因素,是求解海水中声波传播问题,调查海底地学特性,及建立典型区域适用地声学模型等研究的重要组成部分,其测量与海底沉积环境密切相关。本文利用Hamilton地声学模型的环境参数和基于物理学的声学模型融合的地声学模型方法,开展了海底沉积环境对海底表层沉积物声学参数测量影响研究,主要利用4种声学模型计算沉积物的压缩波和剪切波的声速与声衰减系数,通过纹理特征的分形方法分析不同地质环境下海底空间沉积特征,预测了不同掠射角下的单砂层、薄层状结构体等海底反射损失。此外,本文对池底层状介质进行了声反射损失测量实验,实验室测量结果与基于物理学的声学模型预测结果基本相符。研究结果将为海底声学理论研究提供基础资料与技术支持,还可为海底表层沉积物快速原位准确测量提供科学依据。The geo-acoustic properties of seafloor surface sediment is identified as the key factors in the underwater acoustic field research and an important part of solving the problem of ocean sound propagation,investigating the seabed acoustic properties,and establishing a suitable model of seabed geo-acoustics for typical areas,whose measurement is closely related to the sedimentary environment.In this paper,the present paper author has tried a new fusion model which combines submarine sedimentary environment element and geo-acoustic model,and conducted a deeply study of the influence of bottom environments on the in-situ acoustic measurement of the geo-acoustic properties of seafloor surface sediments.This paper mainly has calculated the compressional wave velocity and shear wave velocity by using VGS(λ)model,Biot-Stoll model,CREB model and EDFM model respectively,has applied the fractal method based on texture features to analyze on sedimentary environment and spatial characteristics of seafloor sediment,and has calculated the reflection loss of single sand layer and thin layer structure under different grazing angles according to reflection method.And meanwhile,the in-situ acoustic measurement experiment simultaneously acquired acoustic reflection loss of layered media,and compared the differences in obtained results between the theoretical analysis and laboratorial measurement.The analytical and experimental results are found to be in fairly satisfactory agreement.The research results are of significance as a technological support to providing some basic data for the research with acoustic theoretical proof,and a reference to implementing the scientific standards design in the precise in-situ acoustic measurement system of seafloor surface sediment.

关 键 词：表层沉积物 声学参数 沉积环境 纹理特征 空间特征 

分 类 号：P736.211[天文地球—海洋地质] P733.23[天文地球—海洋科学]