Application of Transient Electromagnetic Method in Pipeline Leakage Detection Based on COMSOL Simulation

Urban underground pipelines are intimately linked to the daily lives of residents; however, the dangers posed by pipeline leaks cannot be overlooked. Currently, a variety of technological methods are available for detecting pipeline leaks. The transient electromagnetic method, known for its sensitivity to low-resistivity anomalies and its non-destructive detection capabilities, is widely used in the detection of urban road disasters. To effectively detect urban road disasters, transient electromagnetic detection technology is employed, and models are established using COMCOL simulation software to simulate the induced electromotive force curves at different stages of pipeline leakage and the changes in induced electromotive force as the coil approaches the anomaly. Research indicates that water-bearing low-resistivity anomalies significantly influence the degree and location of bends in the early signals of the TEM time-voltage curves, which are strongly correlated with the depth and volume of the anomalies. This phenomenon assists in making a preliminary assessment of the depth and volume of subsurface water-bearing anomalies based on the morphology of the time-voltage curves obtained initially.