Transport and retention from single to multiple fractures in crystalline rock at Äspö (Sweden): 1. Evaluation of tracer test results and sensitivity analysis.

作者: V. Cvetkovic , H. Cheng , J. Byegård , A. Winberg , E.-L. Tullborg

DOI: 10.1029/2009WR008013

关键词:

摘要: We evaluate the breakthrough curves obtained within a comprehensive experimental program for investigating retention properties of crystalline rock, referred to as Tracer Retention Understanding Experiments (TRUE). The tracer tests were conducted at Aspo Hard Rock Laboratory (Sweden) in two phases jointly TRUE Block Scale (TBS); TBS comprise total 17 with nonsorbing and range sorbing tracers. Euclidian length scales are between 10 30 m, compared 5 m earlier TRUE-1. unlimited diffusion model is consistent measured adopted here evaluation. has four independent parameters, which related advection dispersion, one diffusion-sorption, surface sorption; individual parameters or cannot be inferred from alone require additional constraints. mean water residence times 15-250 h, whereas coefficient variation 0.4-0.6. A trend found calibrated sorption affinities tracers involved. Using Bode sensitivity functions, it shown that increases parameter increasing affinity; tracers, hydrodynamic dispersion "compete," exhibiting similar effects; hence, their estimates uncertain. analysis presented exposes few fundamental limitations sensitivities when evaluating diffusion-controlled subsurface; general applicable any site comparable test data. In part 2, will how discrete fracture network simulations based on hydrostructural information available can used further constraining particular, active specific area (s(f)) rock matrix porosity (theta).

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