An Approximative Method for Analyzing the Magnetic Field Data to Determine the Location of Preferential Flow Paths in Earthen Dam
Main Article Content
Abstract
The AC magnetic field method allows locating the preferential flow path in the body and foundation of the earthen dam based on the magnetic signals produced by the alternating current flowing in a permeable zone. This paper presents an approximate method for analyzing the magnetic field to determine the location of the flow path in 3D. This method was verified on a hypothetical model built on ANSYS software and 3D physical model and then tested on magnetic field data measured at the study dam. The results show the feasibility of the proposed calculation method with the spatial error between the calculated flow path and the flow paths of the models below 12%. The result of the simulated magnetic field generated by the calculated flow path based on data measured at the dam shows the normalized root-mean-square error between the two sets of measured data and simulated data is about 30%.
Keywords
AC magnetic field, preferential flow paths, earthen dam
Article Details
References
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[3] P. L. Camarero, C. A. Moreira, Geophysical investigation of earth dam using the electrical tomography resistivity technique, REM: Int. Eng. J 70 1 (2017) 47-52.
[4] Ken Y. Lum, Megan R. Sheffer, Dam safety: Review of geophysical methods to detect seepage and internal erosion in embankment dams, Hydro Review 29 2 (2010).
[5] A.K. Hughes, Experiences with “a new means” of leakage detection, Proceedings of the 2nd international congress on dam maintenance and rehabilitation, Spain (2010) 1079-1084.
[6] Willowstick Technologies, LLC, Subsurface hydrogeologic system modeling, Patent number: 8688423 (2012).
[7] C. Urlich, A. Hughes, and V. Gardner, Tailings seepage paths mapped using electric-based technology, Mine Water and Circular Economy IMWA (2017) 64-72.
[8] R. Blanchard, J. Kennedy, Using technology to identify seepage flow paths through, under and around tailings impoundments, Proceedings of Tailings and Mine Waste (2019).
[9] Debora M. Katz, Physics for scientists and engineers: Foundations and connections, Cengage learning (2016) 942.