A problem of diagnostics of a pipeline by thermal fields is considered. Numerical simulation of heat transfer processes is presented. The mathematical model of heat propagation in upper layers of soil is described with accounting filtration of ground water in soil and climatic factors of the area. The thermal processes suppose the pipeline as an underground heat source. This problem leads to solution of heat diffusivity equation with nonlinear boundary conditions and allows to investigate interaction of natural thermal fields and the pipeline thermal trace. Approaches to analysis of thermal fields are considered to detect damages of underground pipelines. An influence of background climatic conditions is discussed.
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