Abstract
The characterization of fracture rocks is always a key issue in understanding the flow and solute transport in fractured media. This article studies the solute transport in a Channeled Single Fracture (CSF), a single fracture with contact in certain areas. The flow in a CSF often has preferential pathways and the transport in a CSF often has Break Through Curves (BTCs) with long tails. The Surface Contact Ratio (SCR), the ratio of the contact area to the total fracture area, is an important indicator for the fracture surface roughness. To study the flow and solute transport in a CSF, a controlled physical model is constructed and a series of flow and tracer test experiments are carried out. Under our experimental conditions, the flow in a CSF is found to follow the Forchheimer equation J = av bv2, where J and v are the hydraulic gradient and the average pore velocity, respectively and a and b are two parameters related to the viscous and inertial flow components, respectively. Furthermore, it is found that b decreases with the decrease of SCR. For the solute transport, it is found that the BTCs often deviate from the traditional Fickian behavior, by the early-arrival and the long tailing. More interestingly, the observed BTCs often have a double-peak or a multi-peak, that would be difficult to explain using the existing transport theory such as the Advection-Dispersion Equation (ADE). In addition, the longitudinal dispersion coefficient DL is found to be scale-dependent in a CSF and the DL - l relationship is of exponential type.
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QIAN J. Z., ZHAN H. B. and CHEN Z. et al. Experimental study of solute transport under non-Darcian flow in single fracture[J]. Journal of Hydrology, 2011, 399(3–4: 246–254.
TAN Ye-fei, ZHOU Zhi-fang. Simulation of solute transport in a parallel single fracture with LBM/MMP mixed method[J]. Journal of Hydrodynamics, 2008, 20(3): 365–372.
TAN Ye-fei, ZHOU Zhi-fang and HUANG Yong. Solute transport in natural fractures based on digital image technology[J]. Journal of Hydrodynamics, 2009, 21(2): 219–227.
CHEN Zhou, QIAN Jia-zhong and LUO Shao-he et al. Experimental study of friction factor for groundwater flow in a single rough fracture[J]. Journal of Hydrodynamics, 2009, 21(6): 820–825.
BRUSH D. J., THOMSON N. R. Fluid flow in synthetic rough-walled fractures: Navier-Stokes, Stokes, and local cubic law simulations[J]. Water Resource Research, 2003, 39(4): 1085–1099.
ZIMMERMAN R. W., CHEN D. W. and COOK N. G. W. The effect of contact area on the permeability of fractures[ J]. Journal of Hydrology, 1992, 139(1–4: 79–96.
QIAN J. Z., CHEN Z. and ZHAN H. B. Solute transport in a filled single fracture under non-Darcian flow[J]. International Journal of Rock Mechanics Mining Sciences, 2011, 48(1): 132–140.
QIAN J. Z., CHEN Z. and ZHAN H. B. Experimental study of the effect of roughness and Reynolds number on fluid flow in rough-walled single fractures: A check of local cubic law[J]. Hydrological Processes, 2011, 25(4): 614–622.
ABELIN H., BIRGERSSON L. and WIDEN H. et al. Channeling experiments in crystalline fractured rocks[J]. Journal of Contaminant Hydrology, 1994, 15(3): 129–158.
BAUGET F., FOURAR M. Non-Fickian dispersion in a single fracture[J]. Journal of Contaminant Hydrology, 2008, 100(3–4): 137–148.
MCKENNA S. A., WALKER D. D. and ARNOLD B. Modeling dispersion in three-dimensional heterogeneous fractured media at Yucca Mountain[J]. Journal of Contaminant Hydrology, 2003, 6263: 577–594.
ZHAO Z. B., JING L. and NERETNIEKS I. Evaluation of hydrodynamic dispersion parameters in fractured rocks[J]. Journal of Rock Mechanics and Geotechincal Engineering, 2010, 2(3): 243–254.
CARDENAS M. B., SLOTTKE D. T. and KETCHAM R. A. et al. Navier-Stokes flow and transport simulations using real fractures shows heavy tailing due to eddies[J]. Geophysical Research Letters, 2007, 34: L14404.
MORENO L., TSANG C. F. Multiple-peak response to tracer injection tests in single fractures: A numerical study[J]. Water Resource Research, 1991, 27(8): 2143–2150.
WU Rong, ZHOU Zhi-fang. Stochastic single fissure aperture simulation based research of solute transport[J]. Journal of Hohai University (Natural Sciences), 2004, 32(1): 87–90. (in Chinese).
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Project supported by the National Natural Science Foundation of China (Grant No. 40872166)
Biography: CHEN Zhou (1983-), Male, Ph. D. Candidate
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Chen, Z., Qian, Jz. & Qin, H. Experimental Study of the Non-Darcy Flow and Solute Transport in a Channeled Single Fracture. J Hydrodyn 23, 745–751 (2011). https://doi.org/10.1016/S1001-6058(10)60172-2
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DOI: https://doi.org/10.1016/S1001-6058(10)60172-2