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Application of physical nonequilibrium CDE model to inverse hydrogeological parameters of karst conduit
Pages: 56-59
Year: Issue:  9
Journal: Geotechnical Investigation & Surveying

Keyword:  nonequilibrium CDEkarst conduittracer-breakthrough curves(TBCs)tracer test;
Abstract: A physical nonequilibrium CDE model is used to simulate tracer-breakthrough curves(TBCs)to obtain hydrogeological parameter of karst conduit.Contrast with traditional model,the fluid is divided into mobile and immobile fluid regions in this model which could reflect effectively the heterogeneity of karst conduit and the tails associated with TBCs.The tracer recovery is confirmed and the TBCs are obtained by automatic monitoring of concentration and changes of flow.The initial parameters are calculated by QTRACER2 program.The hydrogeological parameters such as average velocity,dispersion coefficient,partitioning coefficient and mass transfer coefficient is simulated by physical nonequilibrium CDE model.By comparing the BTCs of different distances,it is found that the mean velocity and dispersion coefficient is becoming greater with distance increases presenting a scale effect obviously.In order to reduce the impact of scale effect,the arithmetical average is used to calculate the velocity and dispersion coefficient.
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