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APPROXIMATE AND ANALYTICAL SOLUTIONS FOR SOLUTE TRANSPORT FROM AN INJECTION WELL INTO A SINGLE FRACTURE
Citation:
Chen, C. AND S. Yates. APPROXIMATE AND ANALYTICAL SOLUTIONS FOR SOLUTE TRANSPORT FROM AN INJECTION WELL INTO A SINGLE FRACTURE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/189.
Description:
In dealing with problems related to land-based nuclear waste management, a number of analytical and approximate solutions were developed to quantify radionuclide transport through fractures contained in the porous formation. t has been reported that by treating the radioactive decay constant as the appropriate first-order rate constant, these solutions can also be used to study injection problems of a similar nature subject to first-order chemical or biological reactions. he fracture is idealized by a pair of parallel, smooth plates separated by an aperture of constant thickness. round water was assumed to be immobile in the underlying and overlying porous formations due to their low permeabilities. owever, the injected radionuclides were able to move from the fracture into the porous matrix by moleculardiffusion (the matrix diffusion) due to possible concentration gradients across the interface between the fracture and the porous matrix. hese transient and steady-state solutions have potential usefulness for quantitative study of problems where radioactive material is injected into a fractured formation for disposal or for tracer tests. hey also can be employed to check the accuracy of portions of pertinent three-dimensional numerical codes. Calculation of the transient solutions is not straightforward, and this paper documents a contained FORTRAN program, which computes the Stehfest inversion, the Airy functions, and gives the concentration distributions in the fracture as well as in the porous matrix for both transient and steady-state cases.