海面波浪起伏对声传播的影响

位于南海某海域同一传播路径上,在2004年和2005年分别进行的两次声传播实验,两次实验中的设备、过程和方法都相同,水文变化也不大,但实验得到的传播损失相差却很大。通过对实验数据的分析表明,两次实验的传播损失差异是由于海面波浪起伏引起的。利用第一次实验数据,考虑海面波浪起伏后反演得到的海底吸收系数可以较好地解释另一次的声传播损失。因此,可以以为浅海海面波浪起伏对声传播的影响很大,在进行水下声传播规律的研究或地声参数反演研究时,应当充分考虑海面波浪起伏的影响。

Effects of wave fluctuation on sound propagation

We had performed two experiments in South China Sea(SCS) in 2004 and 2005 under the same environments except a small difference of hydrological condition,but the Transmission Loss(TL) in the two experiments differs greatly.The analysis shows that the difference was caused by fluctuation of the waves.The TL in the experiment of 2005 can be well explained by making use of the absorption coeffi-cients of sea-bottom,inverted from the experiment of 2004 taking the fluctuation of the wave into account.Therefore,we should take the influence of the fluctuation of sea wave into account when doing research on the regulations of underwater sound propagation and the inversions of the geoacoustics parameters.