海水吸收对远距离水下声场计算的影响

低频声波在海水中短距离传播时,海水吸收对声场的影响几乎可以忽略.但是在实际传播中,传播距离可能达到数百甚至数千千米,此时海水吸收会对声场带来较大影响.在这种情况下,如果选用的水下声场计算程序忽略海水吸收,则远距离的声场计算结果会存在明显误差.分别比较了全反射理想波导和深海Munk声速剖面环境下几种常用声场计算模型的结果...

The influence of water absorption on long-distance underwater acoustic field computation

The acoustic absorption of water is negligible in short-distance low-frequency sound propagation.However,in the actual propagation process,the propagation distance may reach hundreds or even thousands of kilometers.At this time,seawater absorption will have a great impact on the sound field.In this case,significant errors are induced in the long-distance sound field calculation results if the acoustic computation model does not take the acoustic absorption of water into account.The sound fields in ideal total reflection waveguides and in the deep-water environment with Munk sound speed profile are calculated by using several different models to illustrate the effects of the acoustic absorption of water on long-distance sound field calculation.Then,the acoustic absorption of water is added in the RAM model to make it more accurate for the computation of long-distance underwater sound propagation.The results of numerical examples show that the transmission loss obtained by the improved RAM model is consistent with the results given by COUPLE model and SCOOTER model.Therefore,it is confirmed that using the improved RAM model incorporated with the acoustic absorption of water to solve long-distance sound propagation problem is correct and feasible.