用定深爆炸声源反演海底声学参数

发布时间：2018-04-25 03:38

  本文选题：海洋遥感学 + 地声反演　； 参考：《应用海洋学学报》2015年04期

【摘要】：根据2014年在南中国海开展声学试验的定深爆炸宽带声信号数据进行海底地声参数反演.考虑到不同海底声参数对不同声场物理参数的敏感程度不同以及不同海底声参数对不同反演方法的敏感程度亦不同,综合应用2种反演方法得到不同底质声参数:(1)根据接收的直达波和海底反射波计算得到关注海域的海底反射系数进而反演得到海底声阻抗;(2)实验海区的海底地形为大陆坡,选取Hamilton总结的关于沉积物声速与沉积物密度关系的经验公式,结合沉积物声阻抗与沉积物声速、沉积物密度的关系,进而反演得到沉积物声速和沉积物密度.沉积物声学参数的取样测量是在实验室条件下进行的,温度为23℃,大气压1×105Pa,由于沉积物孔隙海水是决定沉积物声速的关键且受温度压强变化的影响显著,本研究利用沉积物声速与孔隙海水声速的比值即使在温度压强变化的情况下较稳定的特点,可对沉积物声速在实验室条件和海底原位条件进行校正.校正到海底温度和压强后,反演结果与沉积物取样的实测结果和Hamilton总结的结果吻合得相当好:(1)声阻抗的反演结果为2.065 6×10~5g/(cm2·s),修正后的沉积物取样结果则为2.046 0×10~5g/(cm~2·s),Hamilton总结的结果为2.238 0×10~5g/(cm~2·s);(2)声速的反演结果为1 482.6m/s,修正后的沉积物取样结果为1 467.5 m/s,Hamilton总结的结果为1 502.8 m/s;(3)密度的反演结果为1.393 2 g/cm3,沉积物取样结果为1.400 0 g/cm~3,Hamilton总结的结果为1.489 0 g/cm3.
[Abstract]:Based on the broadband acoustic signal data of deep explosion conducted in the South China Sea in 2014, the subsea acoustic parameters are retrieved. Considering that the sensitivity of different underwater acoustic parameters to the physical parameters of different sound fields is different, and that different submarine acoustic parameters are also sensitive to different inversion methods, Synthetically using two kinds of inversion methods to get different bottom sound parameters: 1) according to the received direct wave and sea bottom reflection wave, the seabed reflection coefficient of the area of concern is calculated, and then the submarine acoustic impedance is obtained by inversion.) the seabed topography of the experimental sea area is continental slope. The empirical formula about the relationship between sediment sound velocity and sediment density was selected, and the relationship between sediment acoustic impedance and sediment sound velocity and sediment density was combined, and then the sediment sound velocity and sediment density were obtained. The sampling and measurement of sediment acoustic parameters were carried out under laboratory conditions at 23 鈩，

本文编号：1799612