• Journal of Soil and Groundwater Environment
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• v.29 no.5
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• pp.1-13
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• 2024

Repeated tracer tests are often conducted to improve the accuracy of parameter estimation or are sometimes inevitably performed due to mechanical issues or human errors occurred during initial tracer tests. However, residual concentrations from preceding tracer tests can interfere with the injection concentrations of subsequent tests, potentially compromising accuracy of parameter estimation in those later tests. Additionally, repeated injections and interruptions can create transient flow conditions, which have not been adequately considered to date. In this study, a new analytical solution was developed to generate a type curve for repeated tracer tests under transient flow conditions. The solution was validated through numerical simulations. By using the proposed analytical solution, the residual concentration from preceding tracer tests can be effectively accounted for, enabling more accurate parameter estimation for subsequent tracer tests under transient flow conditions.