Bodin Jacques, Porel Gilles, Delay Fred, Ubertosi Fabrice, Bernard Stéphane, de Dreuzy Jean-Raynald
Hydrasa (UMR CNRS 6532) Université de Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France.
J Contam Hydrol. 2007 Jan 5;89(1-2):1-28. doi: 10.1016/j.jconhyd.2006.07.005. Epub 2006 Sep 7.
The Time Domain Random Walk (TDRW) method has been recently developed by Delay and Bodin [Delay, F. and Bodin, J., 2001. Time domain random walk method to simulate transport by advection-dispersion and matrix diffusion in fracture networks. Geophys. Res. Lett., 28(21): 4051-4054.] and Bodin et al. [Bodin, J., Porel, G. and Delay, F., 2003c. Simulation of solute transport in discrete fracture networks using the time domain random walk method. Earth Planet. Sci. Lett., 6566: 1-8.] for simulating solute transport in discrete fracture networks. It is assumed that the fracture network can reasonably be represented by a network of interconnected one-dimensional pipes (i.e. flow channels). Processes accounted for are: (1) advection and hydrodynamic dispersion in the channels, (2) matrix diffusion, (3) diffusion into stagnant zones within the fracture planes, (4) sorption reactions onto the fracture walls and in the matrix, (5) linear decay, and (6) mass sharing at fracture intersections. The TDRW method is handy and very efficient in terms of computation costs since it allows for the one-step calculation of the particle residence time in each bond of the network. This method has been programmed in C++, and efforts have been made to develop an efficient and user-friendly software, called SOLFRAC. This program is freely downloadable at the URL (labo.univ-poitiers.fr/hydrasa/intranet/telechargement.htm). It calculates solute transport into 2D pipe networks, while considering different types of injections and different concepts of local dispersion within each flow channel. Post-simulation analyses are also available, such as the mean velocity or the macroscopic dispersion at the scale of the entire network. The program may be used to evaluate how a given transport mechanism influences the macroscopic transport behaviour of fracture networks. It may also be used, as is the case, e.g., with analytical solutions, to interpret laboratory or field tracer test experiments performed in single fractures.
时域随机游走（TDRW）方法是由德莱和博丹[德莱，F.和博丹，J.，2001年。用于模拟裂缝网络中平流 - 弥散和基质扩散输运的时域随机游走方法。《地球物理研究快报》，28(21): 4051 - 4054。]以及博丹等人[博丹，J.，波雷尔，G.和德莱，F.，2003年c。使用时域随机游走方法模拟离散裂缝网络中的溶质输运。《地球与行星科学快报》，6566: 1 - 8。]最近开发出来用于模拟离散裂缝网络中的溶质输运。假定裂缝网络可以合理地由相互连接的一维管道（即流动通道）网络来表示。所考虑的过程有：（1）通道中的平流和水动力弥散，（2）基质扩散，（3）扩散到裂缝面内的停滞区，（4）在裂缝壁和基质上的吸附反应，（5）线性衰减，以及（6）裂缝交叉处的质量分配。TDRW方法在计算成本方面既方便又非常高效，因为它允许一步计算网络中每个键的粒子停留时间。该方法已用C++编程，并且已努力开发了一个高效且用户友好的软件，称为SOLFRAC。该程序可从网址（labo.univ - poitiers.fr/hydrasa/intranet/telechargement.htm）免费下载。它计算溶质向二维管道网络中的输运，同时考虑不同类型的注入以及每个流动通道内局部弥散的不同概念。模拟后分析也可用，例如整个网络尺度上的平均速度或宏观弥散。该程序可用于评估给定的输运机制如何影响裂缝网络的宏观输运行为。它也可用于，例如，像解析解那样，解释在单个裂缝中进行的实验室或现场示踪剂测试实验。
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