The dual-porosity model and the discrete fracture network model are being used for the analysis of groundwater flow in a fractured aquifer. The dual-porosity model assumes that the porous medium consists of two continua at the macroscopic level, namely, fracture and matrix block. Saturated water flow in the matrix as well as in the fracture pore system is described by using two flow equations which are coupled by water transfer term. The discrete fracture network model assumes that only fracture forms paths for seeping water and that the conductivity in matrix block is neglected.
Investigation of the Models of Flow through Fractured Rock Masses Based on Borehole Data
Flow dynamics and solute transport in unsaturated rock fractures (Thesis/Dissertation) | britanskiovcari.info
Rock fractures play an important role in flow and contaminant transport in fractured aquifers, production of oil from petroleum reservoirs, and steam generation from geothermal reservoirs. In this dissertation, phenomenological aspects of flow in unsaturated fractures were studied in visualization experiments conducted on a transparent replica of a natural, rough-walled rock fracture for inlet conditions of constant pressure and flow rate over a range of angles of inclination. The experiments demonstrated that infiltrating liquid proceeds through unsaturated rock fractures along non-uniform, localized preferential flow paths. Even in the presence of constant boundary conditions, intermittent flow was a persistent flow feature observed, where portions of the flow channel underwent cycles of snapping and reforming. Two modes of intermittent flow were observed, the pulsating blob mode and the rivulet snapping mode. A conceptual model for the rivulet snapping mode was proposed and examined using idealized, variable-aperture fractures. The frequency of intermittent flow events was measured in several experiments and related to the capillary and Bond numbers to characterize this flow behavior.
Theses & Dissertations
Transport Processes in Porous Media pp Cite as. The phenomena of fluid flow in fractured rock is dominated by the fact that is not all parts of the domain are in hydraulic communication. In theory, it is possible to determine connectivity and permeability from stochastic parameters that describe the fracture geometry. When this approach is applied to the field we find it very difficult to sufficiently determine the geometry which controls the flow.