【摘要】 对气泡羽流的声学探测是目前海底冷泉调查的主要手段。在声学探测理论基础上,分析了声学探测过程中CW声波脉冲信号的发射频率、发射功率、声波脉冲宽度(脉冲持续时间)3个参数对海底冷泉气泡羽流探测成像的影响。同时,结合黄、渤海老铁山水道海域海底冷泉外业调查和人工模拟冷泉实验的数据,进一步明确了这些参数的选取原则和范围。针对声学水体剖面上出现的异常干扰带,还提出了改变脉冲发射时延值来消除水体声学剖面图中干扰带的方法,从而进一步优化海底冷泉气泡羽流的声学成像效果。更多还原

【Abstract】 Acoustic detection is an important method for investigation of cold seep bubble plumes.On the basis of acoustic theory,this paper studies the influence of three detection parameters on the bubble plume acoustic detection and imaging,i.e.the emission frequency,the transmitting power,and the width of the pulse(pulse duration)of the CW sonic pulse signal.The principles and ranges for selection of the acoustic detection parameters are further clarified with the data from field investigation and simulation experiment of cold seep at the Laotieshan water channel at the border between the Yellow Sea and the Bohai Sea.In order to reduce the abnormal interference bands in the acoustic water section,the authors proposed a method to eliminate the interference band in the acoustic profile by changing the time delay of pulse emission.It is proved that the method is effective to further optimize the acoustic detection and imaging for the detection of bubble plume of cold seep.更多还原