Parameters and modeling of solute transport under different flow conditions in subterranean river
Guo Fang，Jiang Guanghui*，Yu Shi，Lin Yushi
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Key Laboratory of Karst Dynamics，Institute of Karst Geology，Guilin，541004，China； The International Research Center on Karst under the Auspices of UNESCO，Guilin，541004，China
Eleven tracer tests were conducted under different discharge conditions in a karst conduit in Guancun subterranean river.50 kg of NaCl was injected into a karst window in impulse manner every time.Specific electrical conductivity was autorecorded，and discharge was measured with current meter.QTRACER2 was used to estimate parameters of conduit，flow and dispersion through breakthrough curves.The section value of conduit varies little among the tests，indicating the conduit is filled with water even in the lowest discharge.Reynolds numbers in all tests are bigger than 20000，which are exceeded the threshold value of turbulence flow.Dispersion coefficient is linear with the mean tracer velocity.The classic one dimension advection dispersion equation was used to simulate the breakthrough curves.The results show the modeling curves have bigger tracer transit time than the actual values，causing by the actual velocity of conduit section was replaced by the mean velocity，rather than resulting from variable conduit shape.To reduce this error，a transit storage model of OTIS was used to simulate and calculate parameters.The section of conduit was divided into main channel and storage zone.The OTIS model is successful for simulating these tests.
Guo Fang，Jiang Guanghui*，Yu Shi，Lin Yushi.
Parameters and modeling of solute transport under different flow conditions in subterranean river[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(3): 496-502
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