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首页> 外文期刊>Journal of environmental & engineering geophysics >Geophysical Monitoring Techniques for Underwater Landslide in 1g Models
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Geophysical Monitoring Techniques for Underwater Landslide in 1g Models

机译：1g模式下的水下滑坡地球物理监测技术

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Underwater landslides along coastal regions can be considerably large and yield many potential hazards. Many laboratory experiments have been carried out by modeling submerged landslides to understand their failure mechanisms and to develop useful design and construction concepts in an attempt to overcome these problems. This paper presents the implementations of three high resolution geophysical techniques including electrical resistance profile, ultrasonic compressional wave reflection imaging, shear wave geotomography, and a pressure-based method to investigate lab-scaled submerged mass movements of layered soil specimens. Electrical resistance profiles of a soil mass obtained by inserting an electrical resistance probe provide the spatial distribution of soil layers. Ultrasonic reflection images based on the acoustic impedance mismatch between materials are applied to detect layers and landslides with submillimeter resolution. Pixel-based images of underwater landslides are created by the inversion of the boundary information derived from the travel times of shear waves. The changes of vertical total stress caused by landslides are detected by using flexible stress sensors in the pressure-based method. The experimental results show that the electrical resistance, ultrasonic wave imaging, and total stress change can provide complementary information, and their associations with a shear wave velocity tomography image provide a better understanding of underwater landslides. This study suggests that these geophysical techniques may be effective tools for the investigation of underwater landslides simulated by a shaking table and centrifuge testing.
机译：沿海地区的水下滑坡可能相当大，并产生许多潜在的危害。通过对淹没的滑坡进行建模，已经进行了许多实验室实验，以了解其破坏机理并开发出有用的设计和施工概念，以试图克服这些问题。本文介绍了三种高分辨率地球物理技术的实现方式，包括电阻剖面，超声压缩波反射成像，剪切波地形学和基于压力的方法，用于研究实验室规模的分层土壤样本的淹没质量运动。通过插入电阻探针获得的土壤团块的电阻轮廓提供了土壤层的空间分布。基于材料之间的声阻抗失配的超声反射图像被应用于检测亚毫米分辨率的层和滑坡。水下滑坡的基于像素的图像是通过反演由剪切波的传播时间得出的边界信息而创建的。在基于压力的方法中，通过使用柔性应力传感器来检测由滑坡引起的垂直总应力的变化。实验结果表明，电阻，超声波成像和总应力变化可以提供互补的信息，并且它们与剪切波速度层析成像图像的关联可以更好地了解水下滑坡。这项研究表明，这些地球物理技术可能是研究振动台和离心机试验模拟的水下滑坡的有效工具。

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