A continuum representation of fracture networks. Part II: application to the Äspö Hard Rock laboratory

Svensson, Urban

doi:10.1016/s0022-1694(01)00436-x

Cited by 52 publications

(31 citation statements)

References 5 publications

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“…Often, the selection between a DFN and FC model is dependent on scale; DFN models are favored at smaller scales where they remain computationally feasible and FC models are used for larger‐scale models. However, comparisons between DFN and FC models have shown that both methods are equally capable of capturing key aspects of flow and transport in fractured crystalline rock masses [ Svensson , 2001b; Selroos et al , 2002; Ando et al , 2003].…”

Section: Simulation Of Fractures Flow and Transportmentioning

confidence: 99%

“…For example, two parallel unconnected fractures placed in the same finite difference cell are made connected. For our simulations, enhanced connectivity is not a concern since the cell size is much smaller than the average fracture spacing [e.g., Svensson , 2001b]. To further minimize the connectivity between fractures, a percolation algorithm could have been used to limit the simulations only to the individual fractures that form a hydraulic backbone.…”

Section: Simulation Of Fractures Flow and Transportmentioning

confidence: 99%

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Transport of conservative solutes in simulated fracture networks: 1. Synthetic data generation

Reeves

Benson

Meerschaert

2008

Water Resources Research

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[1] This paper investigates whether particle ensembles in a fractured rock domain may be adequately modeled as an operator-stable plume. If this statistical model applies to transport in fractured media, then an ensemble plume in a fractured rock domain may be modeled using the novel Fokker-Planck evolution equation of the operator-stable plume. These plumes (which include the classical multi-Gaussian as a subset) are typically characterized by power law leading-edge concentration profiles and super-Fickian growth rates. To investigate the possible correspondence of ensemble plumes to operator-stable densities, we use numerical simulations of fluid flow and solute transport through largescale (2.5 km by 2.5 km), randomly generated fracture networks. These two-dimensional networks are generated according to fracture statistics obtained from field studies that describe fracture length, transmissivity, density, and orientation. A fracture continuum approach using MODFLOW is developed for the solution of fluid flow within the fracture network and low-permeability rock matrix, while a particle-tracking code, random walk particle method for simulating transport in heterogeneous permeable media (RWHet), is used to simulate the advective motion of conservative solutes through the model domain. By deterministically mapping individual fractures onto a highly discretized finite difference grid (1 m Â 1 m Â 1 m here), the MODFLOW ''continuum'' simulations can faithfully preserve details of the generated network and can approximate fluid flow in a discrete fracture network model. An advantage of the MODFLOW approach is that matrix permeability can be made nonzero to account for any degree of matrix flow and/or transport.

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Section: Simulation Of Fractures Flow and Transportmentioning

confidence: 99%

Section: Simulation Of Fractures Flow and Transportmentioning

confidence: 99%

Transport of conservative solutes in simulated fracture networks: 1. Synthetic data generation

Reeves

Benson

Meerschaert

2008

Water Resources Research

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“…A sim i lar method of ground wa ter mod el ling has been applied by many au thors (e.g., Cacas et al, 1990;Svens son, 2001;Wu et al, 2004) but the pro posed ap proach to mod el ling of small moun tain ous catch ment is tested for the first time.…”

Section: Discussionmentioning

confidence: 99%

New approach to hydrogeological modelling and source data collecting in a small mountainous hard rock basin – experiences from the Sudetes Mts. (SW Poland)

Wcisło

Olichwer

2013

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We dem on strate a new re search meth od ol ogy into flow paths and ground wa ter re sources with in small hard rock bas ins, where lit tle hydrogeological data is avail able, a pic ture may be ob tained by mod el ling. Data has been col lected in the Z³oty Potok River catch ment (area 4.4 km 2 ), lo cated in the east ern Sudetes Mts. (SW Po land). The study area, as for most small hard rock bas ins in the Sudetes Mts. is char ac ter ized by: (1) steeply slop ing ter rain, (2) a com plex flow sys tem con nected to sev eral me dia, (3) poorly con strained hydrogeological pa ram e ters. In such con di tions, ground wa ter mod els are dif fi cult to im ple ment. To over come these dif fi cul ties, we ap plied a con cept of mixed flow ruled by laws of Darcy (po rous me dia) and Hagen-Poiseuille (frac tured me dia), and the con cept of three wa ter-bear ing zones, a clas sic so lu tion for scales of above several sq km, com bined with a dis crete frac ture model. Field data ap plied for mod el ling were col lected over one year, mea suring all man i fes ta tions of ground wa ter oc cur rence: (1) ef fec tive in fil tra tion (lysimeter), (2) frac ture map ping, (3) stream flow and flow dis ap pear ance. As a re sult of mod el ling, spe cific flow do mains were iden ti fied; which form a sys tem of zones, charac ter ized by dif fer ent ge om e tries and flow ve loc i ties. A new, pre vi ously un rec og nized zone of con sid er able im por tance for wa ter ex trac tion, i.e. frac tures in the river val ley axis, reach ing a deep part of the orogen (up to 300 m b.g.l.) was de fined. The re la tion ships in ves ti gated al lowed prepation of a prog no sis for deep ground wa ter in take lo ca tions in poorly de scribed mountain ous ar eas. The suc cess of the so lu tions ob tained in this typ i cal moun tain ous river ba sin sug gests that this method may be come ef fi ciently and widely used in other hard rock ar eas. The re search un der taken of fers an in no va tive, ef fi cient approach to ground wa ter re source as sess ment in hard rock.

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“…As a result, a large number of experiments have been carried out in these formations: Ä spö in Sweden (Tsang et al, 1996;Svenson, 2001b); Grimsel in Switzerland (Davey Mauldon et al, 1993;Martinez-Landa and Carrera, 2005), Fanay-Augères in France (Cacas et al (1990)); Mirror Lake in Utah, USA (Shapiro and Hsieh, 1991;Day-Lewis et al, 2000); El Berrocal (Guimerà et al, 1995) and Ratones mine (Martinez-Landa and Carrera, submitted), both in Spain. In particular, the FEBEX experiment (Full scale Engineered Barrier EXperiment) aims at studying the engineered barrier surrounding the waste and its interaction with the host rock (granodiorite) (ENRESA, 1998).…”

Section: Introductionmentioning

confidence: 99%

A methodology to interpret cross-hole tests in a granite block

Martinez-Landa

Carrera

2006

Journal of Hydrology

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A continuum representation of fracture networks. Part II: application to the Äspö Hard Rock laboratory

Cited by 52 publications

References 5 publications

Transport of conservative solutes in simulated fracture networks: 1. Synthetic data generation

Transport of conservative solutes in simulated fracture networks: 1. Synthetic data generation

New approach to hydrogeological modelling and source data collecting in a small mountainous hard rock basin – experiences from the Sudetes Mts. (SW Poland)

A methodology to interpret cross-hole tests in a granite block

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