不同频率条件下海月水母（Aurelia aurita）目标强度测量及分析

Measurement and Analysis for Target Strength of Jellyfish(Aurelia aurita) at Different Frequency

摘要:

为获得海月水母不同频率下声学特征，在水池条件下，运用鱼探仪对海月水母开展目标强度(TS)测量实验。结果表明，伞径约为10cm海月水母，姿态角在60°~90°时，单频（120kHz）条件下，目标强度测量值为-66~-63dB，接近高通液球模型；宽频（90~170kHz）条件下，目标强度测量值为-61~-59dB，接近Mutlu目标强度和伞径的关系式模型。并进一步分析相同伞径水母目标强度测量值产生差异的原因。这些将为核电站冷源致灾生物的浅海宽频探测提供参考。

Abstract:

In order to obtain the acoustic characteristics of the jellyfish(Aurelia aurita) at different frequencies, the Target Strength (TS) measurement experiment was carried out on the jellyfish with an echosounder in the pool. The results showed when the attitude angle of the jellyfish was 60 °~90 ° and the bell diameter was about 10 cm, the measured value of the TS was - 66~- 63dB at 120 kHz, which was close to the high flux liquid sphere model, and the measured value of the TS was - 61~- 59dB in the frequency band of 90~170kHz, which was close to the Mutlu bell-diameter model. In addition, the reasons for the differences in the measured TS of the jellyfish with the same bell diameter were given. The conclusion of this thesis will provide a reference for nuclear power plants to conduct a detection of cold source disaster causing organisms in shallow sea with a broadband echosounder.