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首页> 外文会议>European Conference on Underwater Acoustics >A LINE IN THE WATER - DESIGN AND ENACTMENT OF A CLOSED LOOP, MODEL BASED SOUND LEVEL BOUNDARY ESTIMATION STRATEGY FOR MITIGATION OF BEHAVIOURAL IMPACTS FROM A SEISMIC SURVEY
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A LINE IN THE WATER - DESIGN AND ENACTMENT OF A CLOSED LOOP, MODEL BASED SOUND LEVEL BOUNDARY ESTIMATION STRATEGY FOR MITIGATION OF BEHAVIOURAL IMPACTS FROM A SEISMIC SURVEY

机译：一种闭环的水设计和制定的线，基于模型的地震调查阻碍行为影响的模型声级边界估计策略

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During the period from 17 June to 2 July 2010 a 4D seismic survey was conducted for Sakhalin Energy Investment Company Ltd offshore the Astokh region of north-eastern Sakhalin Island, in the Russian Far East. This area includes the summer feeding grounds of the Western Grey Whale (Eschrichtius robustus), an endangered species. A total of 35 survey lines were acquired, some of them requiring repeat passes (complete or partial) because of technical issues, interruptions related to weather and visibility, or shutdowns due to the presence of whales in critical regions. Throughout the survey a field team of scientists (the authors among them) supported by the oil & gas company put into action a sophisticated noise exposure mitigation plan, developed through a multidisciplinary effort [1], which relied on an extensive pre-operation numerical modelling of the acoustic footprint of the seismic airgun array for a large number of source positions along each acquisition line. This preparatory work generated a comprehensive library of model cases that covered a broad range of potential sound propagation conditions through a combination of different acoustic medium parameters and sound level offset adjustments. Two types of modelling results were used in the field for distinct purposes. The first were sequences of estimated per-pulse Sound Exposure Level (SEL) values at the sea floor, indexed by source run distance (KP) along a survey line, at the sites of nine bottom-deployed acoustic telemetry stations. These sequences were used by the acoustics monitoring team to select a model case best matching the received pulse levels during the initial minute of a line acquisition, and thereafter to monitor and verify the accuracy of the model estimates as the seismic vessel progressed along the line. The second were static outline maps of the estimated shoreward 156 dB re 1μPa~2-s per-pulse SEL behavioural threshold [1], maximized over depth, for each survey line. These outlines, overlaid on specialized software for cetacean tracking, provided to observer teams a reference boundary - effectively "a line in the water" - defining whether a located animal was in a region where sound levels could cause a behavioural reaction.
机译：在从6月17日至2 2010年7月期间4D地震勘测是为萨哈林能源投资有限公司进行海上东北萨哈林岛Astokh区域，在俄罗斯远东地区。该区域包括了夏季喂养西部灰鲸（Eschrichtius粗壮），濒临灭绝的物种的理由。共有35条测线被收购，他们中的一些需要重复传球（全部或部分），因为技术问题，涉及到天气和能见度，或停产，由于鲸鱼的关键区域存在中断。纵观由石油和天然气公司付诸行动一个复杂的噪声暴露缓解计划支持的调查科学家的场上队员（其中包括作者），通过多学科的努力[1]开发，这依赖于一个广泛的预操作数值模拟的地震气枪阵列为大量沿着每个采集线源位置的声足迹。这种准备工作所产生的涵盖范围广泛的潜在的声音传播条件通过不同的声学介质的参数和声音电平偏置调整的组合模型的情况下的综合库。两种模拟结果在场上被用于不同的目的。第一是在海底估计每个脉冲声暴露级（SEL）值的序列，通过沿勘测线源运行距离（KP）索引，在九个底部展开声学遥测站的地点。这些序列用于由声学监测小组最好选择模型情况下的线取得的初始分钟期间匹配所接收的脉冲电平，之后，以监测和验证模型估计的准确度作为地震容器沿着线进行。第二是所估计的向岸156分贝的静态映射轮廓重新1μPa〜2-S每脉冲SEL行为阈值[1]，最大化在深度，对于每个勘测线。这些轮廓，覆盖对鲸类动物追踪专门的软件，以观察员小组提供的参考边界 - 有效地“在水中行” - 定义位于动物是否是在噪音水平可能会导致行为反应的区域。

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