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首页> 外文会议>OCEANS 2011 >Design and operation specifications of an active monitoring system for detecting southern resident killer whales
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Design and operation specifications of an active monitoring system for detecting southern resident killer whales

机译：南方常驻虎鲸主动监测系统的设计和运行规范

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Before final approval is given to the Snohomish County Public Utility District No. 1 for deploying the first tidal power devices in the United States in an open water environment, a system to manage the potential risk of injury to killer whales due to collision with moving turbine blades must be demonstrated. The Pacific Northwest National Laboratory (PNNL) is tasked with establishing the performance requirements for, constructing, and testing a prototype marine animal alert system for triggering temporary turbine shutdown when there is risk of collision with a killer whale. To develop a system that relies on active sonar two critical areas must be investigated-the target strength of killer whales and the frequency content of commercially available active sonar units. PNNL studied three target strength models: a simple model, the Fourier matching model, and the Kirchoff-ray mode model. Using target strength measurements of bottlenose dolphins obtained by previous researchers and assuming killer whales share similar morphology and structure, PNNL extrapolated the target strength of an adult killer whale 7.5 m in length at a frequency of 67 kHz. To study the frequency content of a commercially available sonar unit, direct measurements of the signal transmitted by the sonar head were obtained by using a hydrophone connected to a data acquisition system in both laboratory and field conditions. The measurements revealed a secondary frequency component at 90 kHz in addition to the primary frequency of 200 kHz. Preliminary results show that the amplitude of the 90-kHz frequency component is above the hearing threshold of killer whales but below the threshold for potential injuries.
机译：在最终批准之前，将斯诺米什县公共公用事业区号码在开放式水环境中部署美国的第一个潮汐动力设备，是一种管理由于与移动涡轮机的碰撞为杀伤鲸鱼的潜在伤害的潜在风险必须证明刀片。太平洋西北国家实验室（PNNL）是任务的，建立了建立和测试原型海洋动物警报系统的绩效要求，当存在与虎鲸发生碰撞的风险时触发临时涡轮机关闭。开发依赖于有源声纳的系统，必须调查两个关键区域 - 杀手鲸的目标强度和市售的有源声纳单元的频率含量。 PNNL研究了三个目标强度模型：一个简单的模型，傅里叶匹配模型和基彻差线模式模型。使用先前研究人员获得的瓶胎海豚的目标强度测量和假设虎鲸共享相似的形态和结构，PNNL以67kHz的频率推断成年杀手鲸的目标强度为7.5米。为了研究市售的Sonar单元的频率内容，通过使用连接到实验室和现场条件的数据采集系统的流水机来获得由声纳头传输的信号的直接测量。除了初级频率为200 kHz之外，测量还在90kHz下揭示了次级频率分量。初步结果表明，90-kHz频率分量的幅度高于杀手鲸的听力阈值，但低于潜在损伤的阈值。

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