浅层气逸出到海水中的气泡声学探测方法

ACOUSTIC DETECTING METHOD FOR BUBBLES FROM SHALLOW GAS TO SEA WATER

针对南黄海西部等地区在海洋调查仪器上发现的海水中浅层气逸出气泡产生的声学羽流等气泡记录,首先根据水体中气泡共振发生非线性振动形成的强烈散射现象,计算了我国浅层气分布海区的常见浅层气逸出气泡共振频率范围、不同调查仪器在水深变化时的探测气泡大小,据此分析了不同调查仪器探测浅层气逸出气泡的范围。其次,根据气泡在水中的变化、运动规律,提出了浅层气逸出气泡应当具备的声学特点,排除了南黄海西部地区形成水体中特征反射的其他可能因素,并探讨了云状扰动的可能形成原因。

In view of acoustic plumes of bubbles in the sea water from shallow gas that were found by marine surveying instruments in some areas of the South Yellow Sea, and based on the strong scattering formed by non-linear vibration when bubbles resonate in the water,we calculated the resonance frequency of common bubbles that seeped from shallow gas in the offshore area and the bubble sizes detected by various surveying instruments at different depths, and outlined ranges of the bubbles from shallow gas found with different instruments. Then, according to the pattern of bubble change and movement in the water, we raised acoustic features that bubbles should have when seeping from shallow gas, removed other possible factors that could form the characteristic reflections in the South Yellow Sea, and discussed the possible cause for cloudy turbidity recorded in the seismic section.