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Monitoring of internal erosion processes by time-lapse electrical resistivity tomography
Journal of Hydrology ( IF 6.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jhydrol.2020.125340
Matteo Masi , Farzad Ferdos , Gabriella Losito , Luca Solari

Abstract Internal erosion phenomena are a major threat to all earthen structures, such as river levees and dams. Studying these phenomena has been limited because they occur concealed inside the material, which makes them difficult to observe and monitor. Non-destructive geophysical monitoring techniques are powerful tools that can provide insight into the processes involved. For this reason, a test rig has been specifically designed to conduct three-dimensional electrical resistivity tomography of soil specimens undergoing internal erosion due to seepage. Two suffusion tests were conducted where the erosion evolution has been monitored. The time-series of eroded mass weight were then used to correlate the changes in three-dimensional resistivity distribution to the porosity change in media by means of Archie’s law. The results from the first suffusion test were used to calibrate Archie’s model parameters. It was found that the resistivity variations were able to predict changes in the porous matrix structure. The data obtained from the second test were used to validate the model parameters and confirmed that the time-lapse three-dimensional inverted resistivity images were able to successfully quantify the global erosion rate.

中文翻译:

通过延时电阻率层析成像监测内部侵蚀过程

摘要 内部侵蚀现象是所有土体结构的主要威胁,如河堤和水坝。对这些现象的研究受到限制,因为它们隐藏在材料内部,这使得它们难以观察和监测。无损地球物理监测技术是强大的工具,可以深入了解所涉及的过程。出于这个原因,专门设计了一个测试台来对因渗流而遭受内部侵蚀的土壤样品进行三维电阻率层析成像。在监测侵蚀演变的情况下进行了两次扩散试验。然后使用侵蚀质量的时间序列通过阿尔奇定律将三维电阻率分布的变化与介质中的孔隙率变化相关联。第一次扩散测试的结果用于校准 Archie 的模型参数。发现电阻率变化能够预测多孔基质结构的变化。第二次测试获得的数据用于验证模型参数,并证实延时三维反演电阻率图像能够成功量化全球侵蚀率。
更新日期:2020-10-01
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