【作者】 陈耀明； 高天赋；

【Author】 Chen Yaoming Gao tianfu(Institute of Acoustics, The Chinese Academy of Sciences Beijing 100080)

【机构】 中国科学院声学研究所；

【摘要】 高声速海底反射损失特性主要决定于海底折射率n₀和海底损失参数ε,它的变化特性以为基本变量,大致可分为三亇区域:（1）近似线性区,（2）剧变区和（3）接近抛物线的缓变区。对远程声传播起决定贡献的线性区,反射损失;对垂直入射状态起主要作用的极近程声场,有LV_r≈In（（m+n）/（m-n））,此时海底密度起主要作用。更多还原

【Abstract】 The reflection loss of sea bottom with high sound velocity is depended on refraction ratio of bottom n₀ and attenuation parameter ε. On the basis of new variable x=sinθ/（1-n₀²）^1/2, the reflection loss curve is divided to three section: （1）the approximately linear section, （2）the fast varying section and （3）the parabolic slowly change section. In the linear section, which largely contributes to long-range propagation, the reflection loss should be expressed LV_r≈mε^1/2x. But in the most near field with vertical incident wave, LV_r≈ln（（m + n）/（m - n））, and the density of sea bottom will be an important parameter.更多还原