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Experimental design, data analysis, and modeling for characterizing the three-dimensional acoustic field of a seismic airgun array.

机译:实验设计,数据分析和建模,用于表征地震气枪阵列的三维声场。

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摘要

In June 2003, the Littoral Acoustic Demonstration Center conducted an acoustic characterization experiment for a standard seismic exploration array. Two moorings with Environmental Acoustic Recording Systems (EARS) were deployed in the northern part of the Gulf of Mexico to measure ambient noise and collect shot information. A 21-element seismic airgun array was towed along five parallel linear tracks with horizontal closest approach points to the EARS buoy position of 63, 500, 1000, 2000, and 5000 m. Calibrated acoustic pressure measurements collected during the experiment were analyzed to obtain zero-to-peak sound pressures, sound exposure levels, and pressure levels in 1/3-octave frequency bands. In addition, the experimental data were modeled by using a modified underwater acoustic propagation model to fill in missing data measurements. The resulting modeling procedure showed good agreement between measured and modeled data in absolute pressure amplitudes and frequency interference patterns for frequencies up to 1000 Hz. The analysis is important for investigating the potential impact on marine mammals and fish and predicting the exposure levels for newly planned seismic surveys in other geographic areas.;Based on results of the experiment conducted and data analysis performed, a new experimental design was proposed to maximize the amount of collected data using the available equipment while minimizing the time needed for the source ship. The design used three patches, one with 3° angular spacing between the lines at a reference depth. Embedded is a smaller patch with 1° spacing and within that a still smaller patch with one half degree spacing. This arrangement gives a reasonably uniform distribution of shots versus solid angle with a large variety of emission and azimuthal angles for different ranges. Due to the uncertainty of positioning systems, the angular space is divided into solid angle bins. Simulations predicted more than 200 shots per bin for emission angles greater than 13 degrees. Statistical analysis of collected data will be performed on the proposed bin basis. An experiment based on the proposed design was conducted in Fall 2007. The data measurements collected during the experiment are currently being analyzed and will be reported in the near future.;Keywords. Airgun array characterization, airgun array, seismic airgun array, underwater acoustics, acoustical data analysis, hydrophone measurements, acoustic propagation modeling.
机译:2003年6月,滨海声学示范中心对标准地震勘探阵列进行了声学表征实验。在墨西哥湾的北部部署了两个带有环境声学记录系统(EARS)的系泊设备,以测量环境噪声并收集射击信息。沿着五个平行的线性轨道拖曳一个21要素的地震气枪阵列,水平接近点指向EARS浮标位置63、500、1000、2000和5000 m。分析在实验过程中收集的校准声压测量值,以获得零峰值声压,声音暴露水平和1/3倍频程频带中的压力水平。此外,通过使用改进的水下声传播模型对实验数据进行建模,以填补缺失的数据测量值。所得的建模过程显示,在高达1000 Hz的频率下,测量数据和建模数据在绝对压力幅度和频率干扰模式方面具有良好的一致性。该分析对于调查对海洋哺乳动物和鱼类的潜在影响以及预测其他地理区域新计划的地震勘测的暴露水平非常重要。基于所进行的实验结果和进行的数据分析,提出了一种新的实验设计,以最大程度地提高工作效率。使用可用设备收集的数据量,同时最大程度地缩短源运输所需的时间。设计使用了三个贴片,其中一个贴片在参考深度处的线间距为3°。嵌入的是间距为1°的较小的贴片,而其中的间距为一半度的较小的贴片则位于其中。这种布置可以使发射相对于立体角合理地均匀分布,并具有针对不同范围的多种发射角和方位角。由于定位系统的不确定性,角空间被分成立体角箱。模拟预测,对于大于13度的发射角,每个仓中将有200多个镜头。收集到的数据的统计分析将在建议的bin基础上进行。基于提议的设计的实验于2007年秋季进行。目前正在对实验过程中收集的数据测量进行分析,并将在不久的将来进行报告。气枪阵列表征,气枪阵列,地震气枪阵列,水下声学,声学数据分析,水听器测量,声学传播建模。

著录项

  • 作者

    Tashmukhambetov, Arslan M.;

  • 作者单位

    University of New Orleans.;

  • 授予单位 University of New Orleans.;
  • 学科 Engineering Geophysical.;Physics Acoustics.;Engineering Marine and Ocean.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 64 p.
  • 总页数 64
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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