| Recent years, due to more and more underground projects, safety for watersupply, geological disposal of radionuclide wastes, oil exploitation and geologicalcarbon sequestration concerned strongly by many countries all over the world,Groundwater flow and solute transport in the fractured media have been an importantresearch aspect in hydrogeology. Being strongly heterogeneous, the mechanism offlow and solute transport in fractured media is still not completely understood today.How to quantity the flow and solute transport keeps one of the most challengingproblems in the world.single fracture is basic unit of the fracture net, research them is the foundationto study the natural fracture. This paper is based on the correlative research at homeand abroad, adopts natural fractures of metamorphic rocks without artificialmodification, designs the single fracture model. Then the test of solute and heattransport is performed in the model, fitting the breakthrough curves withadvection-dispersion equation (ADE) equation and TPL model in the ContinuousTime Random Walk model. The results are studied and analyzed, and the conclusionsare drawn as following:(1) The Forchheimer formula, which could be used to describe the nonlinearrelationship between hydraulic gradient and flow velocity in water flow, the fittingresult is better than the traditional Darcy law.(2) The breakthrough curves of solute transport show an obvious smearing effect,the reason may owing to the uneven distribution of aperture and adsorption on solute.(3) The breakthrough curves can be fitted by ADE simulation and TPLsimulation, the results indicates the TPL fitting has a higher precision and is closer tothe variation trend of actual data.(4) Temperature sensor can detect that, the surface of the fracture exchange heatwith flow as fluid flow through a fracture, and the variation in temperature increaseswith the decreasing of flow rate, which can be used to judge the fracture aperturedistribution. |
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