The main purpose of this study is to demonstrate the feasibility and the limitation of the application of GPR to detect buried pipes in tropical soils of eastern region of Brazil. The sites are close to rivers crossed by the pipelines. We propose a fast procedure involving soil analysis and electrical conductivity measurements before decide the initiation of a GPR campaign to detect buried pipelines. The procedure consists of: (1) the measurement of the humidity (degree of moisture); (2) the measurement of amount and analysis of the type of clay; (3) measurement of electrical conductivity; and finally (4) analysis of salt, calcium carbonate and organic material. The northeast Brazilian soils with mud content between 10 to 30 % still offer some information about the pipes; and soil with more than 30% of mud usually does not allow the GPR generate good sections. The amount of organic material usually is higher than 1,5% on mud and conductive soils and are less than 0,40% on resistive soils. All this factors affect the electrical conductivity of the soils and we can see that regular to good GPR results are possible in soils with electrical conductivity from 90 to 480 Ohm.m.


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