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Acoustic measurement of suspensions of clay and silt particles using single frequency attenuation and backscatter

机译：使用单频衰减和反向散射声学测量粘土和淤泥颗粒的悬浮液

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摘要

The use of ultrasonic acoustic technology to measure the concentration of fine suspended sediments has the potential to greatly increase the temporal and spatial resolution of sediment measurements while reducing the need for personnel to be present at gauging stations during storm events. The conversion of high-frequency attenuation and backscatter amplitudes to suspended silt and clay concentration has received relatively little attention in the literature. In order to improve the state of knowledge, a laboratory investigation was undertaken by the National Center for Physical Acoustics in cooperation with the USDA-ARS National Sedimentation Laboratory. In these experiments, two immersion transducers were used to measure attenuation and backscatter from 20 MHz acoustic signals propagated through suspended clay (smectite and kaolinite) and silt particles. The resulting data includes attenuation values for a wide range of concentrations (0.3-14 g/L) and particle sizes (0.03-14 μm diameter). Attenuation curves for each particle were compared to the theoretical attenuation curves developed by Urick (1948) and Sheng and Hay (1988) for scattering as presented by Landers (2010). In addition, it was found that the backscatter signal could be used to discriminate between suspensions dominated by clay or silt.
机译：使用超声波技术测量细微悬浮沉积物的浓度有可能极大地提高沉积物测量的时间和空间分辨率，同时减少暴风雨期间人员在测站工作的需要。高频衰减和反向散射振幅到悬浮泥沙和粘土浓度的转换在文献中很少受到关注。为了提高知识水平，国家物理声学中心与USDA-ARS国家沉积实验室合作进行了实验室调查。在这些实验中，使用了两个浸没式换能器来测量通过悬浮粘土（蒙脱石和高岭石）和粉砂颗粒传播的20 MHz声波信号的衰减和反向散射。所得数据包括各种浓度（0.3-14 g / L）和粒径（直径0.03-14μm）的衰减值。将每个粒子的衰减曲线与Urick（1948）和Sheng and Hay（1988）提出的理论衰减曲线（如Landers（2010）提出）进行比较。此外，发现反向散射信号可用于区分以粘土或淤泥为主的悬浮液。

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  • 来源
    《Applied Acoustics》 |2014年第11期|123-129|共7页
  • 作者

    Wayne O. Carpenter Jr.; Bradley T. Goodwiller; James P. Chambers; Daniel G. Wren; Roger A. Kuhnle;

  • 作者单位

    National Center for Physical Acoustics, University of Mississippi, 1 Coliseum Drive, University, MS 38677-1848, United States;

    National Center for Physical Acoustics, University of Mississippi, 1 Coliseum Drive, University, MS 38677-1848, United States;

    National Center for Physical Acoustics, University of Mississippi, 1 Coliseum Drive, University, MS 38677-1848, United States;

    USDA-ARS-NSL, P.O. Box 1157, Oxford, MS 38655, United States;

    USDA-ARS-NSL, P.O. Box 1157, Oxford, MS 38655, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sediment; Ultrasound; Attenuation; Backscatter; Fines;

    机译：沉淀;超声波衰减;反向散射;罚款;

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