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| Titel |
Bench scale laboratory tests to analyze non-linear flow in fractured media |
| VerfasserIn |
C. Cherubini, C. I. Giasi, N. Pastore |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 8 ; Nr. 16, no. 8 (2012-08-06), S.2511-2522 |
| Datensatznummer |
250013409
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| Publikation (Nr.) |
 copernicus.org/hess-16-2511-2012.pdf |
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| Zusammenfassung |
The knowledge of flow phenomena in fractured rocks is very important for
groundwater resources management in hydrogeological engineering.
A critical emerging issue for fractured aquifers is the validity of the
Darcian-type "local cubic law", which assumes a linear relationship between
flow rate and pressure gradient to accurately describe flow patterns.
Experimental data obtained under controlled conditions such as in a
laboratory increase our understanding of the fundamental physics of fracture
flow and allow us to investigate the presence of non-linear flow inside
fractures that generates a substantial deviation from Darcy's law.
In this study the presence of non-linear flow in a fractured rock formation
has been analyzed at bench scale in laboratory tests. The effects of
non-linearity in flow have been investigated by analyzing hydraulic tests on
an artificially created fractured rock sample of parallelepiped
(0.60 × 0.40 × 0.8 m) shape.
The volumes of water passing through different paths across the fractured
sample for various hydraulic head differences have been measured, and the
results of the experiments have been reported as specific flow rate vs. head
gradient. The experimental results closely match the Forchheimer equation
and describe a strong inertial regime. The results of the test have been
interpreted by means of numerical simulations. For each pair of ports,
several steady-state simulations have been carried out varying the hydraulic
head difference between the inlet and outlet ports. The estimated linear and
non-linear Forchheimer coefficients have been correlated to each other and
respectively to the tortuosity of the flow paths. A correlation among the
linear and non-linear Forchheimer coefficients is evident. Moreover, a
tortuosity factor that influences flow dynamics has been determined. |
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