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- W3093592320 abstract "Comment on “Sensitivity of the active fracture model parameter to fracture network orientation and injection scenarios” by Basagaoglu et al. (2009) Hui-Hai Liu Earth Sciences Division Lawrence Berkeley National Laboratory Berkeley, California Basagaoglu et al. (2009) present a study on detailed unsaturated flow behavior in two- dimensional fracture networks using numerical experiments (simulations) based on the lattice-Boltzmann method. Their results are valuable for improving our understanding of unsaturated flow processes and evaluating the active fracture model (AFM) that was developed for capturing large-scale preferential flow in fractured rocks (Liu et al., 1998; As indicated in Basagaoglu et al. (2009), a previous study was conducted to evaluate the AFM with numerical experiments (Seol et al., 2003). However, the methodology used in that study and the corresponding conclusions are highly questioned for the following two reasons. First, the evaluation relies on a condition that simulated water flow processes in a fracture network are adequately represented with a continuum approach, because they draw their conclusions by comparing simulation results with those obtained from a dual-continuum model based on the AFM. No effort was made by Seol et al. (2003) to justify the validity of the continuum approach for their specific fracture network that includes a small number of fractures only. (The analyses of Basagaoglu et al. (2009) do not need the similar condition.) Second, Seol et al. (2003) use numerical dispersion to represent the matrix diffusion process. This treatment is not valid simply because numerical dispersion results from numerical errors and is not a physical process. The AFM divides fractures into two parts, active and inactive. Flow occurs only in the active part (Liu et al., 1998). The portion of the active part (f a ) is given by f a S e where S e is the effective saturation in fractures and γ is the so-called AFM parameter that is considered to be a constant for a given fracture network. Equation 1 was originally" @default.
- W3093592320 created "2020-10-29" @default.
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- W3093592320 date "2010-08-24" @default.
- W3093592320 modified "2023-09-23" @default.
- W3093592320 title "Comment on Sensitivity of the active fracture model parameter to fracture network orientation and injection scenarios by Basagaoglu et al. (2009)" @default.
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