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第 42 卷 第 2 期                                                                       Vol. 42, No. 2
             2023 年 3 月                          Journal of Applied Acoustics                    March, 2023

             ⋄ 研究报告 ⋄



                      基于等效密度流体模型的地声参数分析                                                          ∗





                                          李 鹏     1,2  鹿力成     1†    吴金荣      1,2


                                              (1 中国科学院声学研究所       北京   100190)

                                                (2 中国科学院大学      北京  100049)
                摘要：目前的地声参数反演多采用液态海底模型，但是实际海底为多孔弹性海底。该文在等效密度流体模型
                基础上，通过计算液态海底和多孔弹性海底的反射系数及传播损失，给出了等效密度流体模型和液态海底模
                型的等效性分析。数值仿真结果表明在低频情况下，多孔弹性海底给出的快纵波声速与等效密度流体模型给
                出的声速以及等效密度流体的实部与真实的海底密度基本一致。将等效密度流体模型近似看作液态海底模型
                进行反射系数和传播损失计算，在小掠射角和远距离时，计算结果表明与多孔弹性海底计算结果具有较好一
                致性，从而以此为依据确定海底为液态，进行地声参数反演。
                关键词：等效密度流体；地声反演；Biot-Stoll 理论；声速比
                中图法分类号: O427.1          文献标识码: A          文章编号: 1000-310X(2023)02-0217-09
                DOI: 10.11684/j.issn.1000-310X.2023.02.003





                   Geoacoustic parameters analysis based on effective density fluid model


                                         LI Peng 1,2  LU Licheng 1  WU Jinrong 1,2


                             (1 Institute of Acoustics of the Chinese Academy of Sciences, Beijing 100190, China)
                                   (2 University of Chinese Academy of Sciences, Beijing 100049, China)

                 Abstract: At present, the inversion of geoacoustic parameters mostly adopts liquid seabed model, but the
                 actual seabed is porous elastic seabed. Based on the effective density fluid model, the equivalence between
                 the effective density fluid model (EDFM) and the liquid seabed model is given by calculating the reflection
                 coefficient and propagation loss of the liquid seabed and the porous elastic seabed. The numerical simulation
                 results show that in the case of low frequency, the fast sound velocity given by the porous elastic seabed is
                 basically consistent with the sound velocity given by the EDFM and the real part of the effective fluid density is
                 basically consistent with the real seabed density. The EDFM is as a fluid modal through calculation of reflection
                 and transmission loss, the results show consistent with porous elastic seabed beyond small grazing angel and
                 far range. Therefore, the seabed can be determined as liquid, and the inversion of geoacoustic parameters can
                 be carried out on this basis.
                 Keywords: Effective density fluid model; Geoacoustic inversion; Biot-Stoll theory; Sound speed ratio



             2021-12-07 收稿; 2022-01-18 定稿
             水声技术重点实验室基金项目 (2021)
             ∗
             作者简介: 李鹏 (1984– ), 男, 黑龙江铁力人, 博士研究生, 研究方向: 水声物理。
             † 通信作者 E-mail: lulicheng@mail.ioa.ac.cn
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