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886127 Air and water flow, II. Gravitational flow with an arbitrary flux boundary condition
277A Parlange (1975). The accuracy of the approximation is checked for the case of constant surface flux, for which an exact analytical solution is available. Good agreement is found except for very small times. The error (maximum 4%) rapidly diminishes as time increases.
8&6131 Permeability of the oceanic crust baaed on experimental studies of basalt permeability at elevated pressures Christensen, N I; Ramananantoandro, R Tectonophysics Vl49, N1/2, June 1988, Pf8l-186
886127 Air and water flow, II. Gravitational flow with an arbitrary flux boundary condition Sander, G C; Parlange, J Y; Hogarth, W L J Hydrol V99, N3/4. 30 May 1988, P22.5-234
Permeability of oceanic basalt as a function of hydrostatic pressure at constant temperature was investigate. The values derived indicate that permeability decreases significantly with increased confining pressure, and support oceanic crustal convection models in which sea water convection occurs largely through macrocracks at relatively shallow depths.
An approximate solution is obtained for one dimensional vertical flow of water and air into a porous medium subject to an arbitrary flux boundary condition. Accuracy is examined by comparison with an exact solution for a constant flux boundary condition. Maximum error (4%) occurs at zero time, and error decreases as time increases. For constant surface water content, the approximate solution reduces to a simple three parameter infiltration law for air and water.
886132 Analytical model of slug teats Karasaki, K; Long, J C S; Witherspoon, P A Water Resow Res V24, NI, Jan 1988. PII5126
886128 Origins of anisotropy Lake, L W J Pet Technol V40, N4, April 1988, P395-396 Permeability anisotropy causes fluid to flow in a direction different from that in which it is pushed. The effects, importance and representations of anisotropy are described. Numerical simulators do not show full effects of anisotropy as they use only 3 components, horizontal,lateral and vertical permeability. The causes of anisotropy in sands and shales are described, and problems incorporating anisotropy in calculations presented. 886129 Evaluation of the hydra&c monitoring measurements of three earth dams by a model of flow in a porous medium (In French) Gousse, F Rev Fr Geotech N43, 1988, P47-66 In service behaviour of three earth dams has been modelled using a 2D transient hydraulic mode1 of a porous medium (Humbert, 1984). Despite some global discrepancies between theory and field results, important information was gained. The transient model was more instructive than the steady state one. The hydraulic parameters of the unsaturated zone do not significantly i~uen~ the results of seepage anaIysis. An accurate deterministic seepage analysis requires the following: an affordable 3D transient flow model, better knowledge of soil hydraulic properties, and more reliable field measurements. 886130 Effect of assumed unit gradient during drainage on the determinationof unsaturated hydra& conductivity and lnlBtration parameters Ahuja, L R; Barnes, B 3; Cassel, D Ic; Bruce, R R; Nofziger, D L soil Sci V145, N4, April 1988, P23.5-243 The unit gradient approximation is introduced. Unsaturated hydraulic conductivjti~ and parameters in the Green-Ampt infiltration equation were determined using the approximation for four soils. Results are compared to those from rigorous Darcian analysis. Hydraulic conductivities in the topsoil determined using the approximation show greatest discrepancies from Darcian values. It is suggested that for near surface hydraulic conductivity determination, tensiometers are installed in the topsoil to measure hydraulic gradients, and Darcian analysis applied.
0
Slug tests are a cheap and simple method of estimating flow parameters of shallow aquifers and fractured rocks. Available analytical solutions are limited to a few ideal cases. A new analysis is presented for heterogeneous systems for the cases of linear flow, radial flow with boundaries, two layer, and concentration composite models with different flow geometries in the inner and outer regions. Type curves are presented for each case. Results suggest that slug tests suffer problems of non-uniqueness to a greater extent than other well tests. 886133 FInid mechanics of fractnre and other junctions Philip, J R Water ResorrrRes V24, N2, Feb 1988, P239-246 Fluid flow at a mode1 junction with four equal coplanar branches meeting at right angies, with two inlets and two outlets, is studied. Both Laplace and Stokes flows are analysed. Errors of proportional routing where the two inlet discharges and two outlet discharges differ greatly have been evaluated. 886134 Modeling of brine transport in porous media Hassanizadeh, S M; Leijnse, T Water Resmr Res V24, N3, March 1988, P321-330 Concentrated brine transport is important in transport of pollutants from a repository in a salt rock formation. A new formulation of the equations describing brine flow and salt transport is presented. Modified versions of Fick’s law and Darcy’s law are employed to account for the effects of high salt con~ntrations. Some possible boundary conditions appiicable to high concentration situations are examined and nonadmissable boundary conditions indicated. Suitable numerical schemes for solving the equations are discussed. 886135 C~tinu~ model for water move~t in an unity fractured rock mass Peters, R R, Klavetter, E A Wuter Resow Res V24, N3, March 1988, P416-430 The movement of fluids in a fractured porous medium is studied. A continuum model to evaluate isothermal movement under slowly changing conditions, primarily slowly changing matrix potential, has been developed for application to a pssible repository site at Yucca Mountain,which contains high and low conductivity nonwelded tuff and low conducti~ty highly porous tuff. Both macroscopic and microscopic approaches are used to calculate coefficients in the flow conductivity equation, and yield similar results.
1988 Pergamon Press plc. Reproduction
not permitted
8&6131 Permeability of the oceanic crust baaed on experimental studies of basalt permeability at elevated pressures Christensen, N I; Ramananantoandro, R Tectonophysics Vl49, N1/2, June 1988, Pf8l-186
886127 Air and water flow, II. Gravitational flow with an arbitrary flux boundary condition Sander, G C; Parlange, J Y; Hogarth, W L J Hydrol V99, N3/4. 30 May 1988, P22.5-234
Permeability of oceanic basalt as a function of hydrostatic pressure at constant temperature was investigate. The values derived indicate that permeability decreases significantly with increased confining pressure, and support oceanic crustal convection models in which sea water convection occurs largely through macrocracks at relatively shallow depths.
An approximate solution is obtained for one dimensional vertical flow of water and air into a porous medium subject to an arbitrary flux boundary condition. Accuracy is examined by comparison with an exact solution for a constant flux boundary condition. Maximum error (4%) occurs at zero time, and error decreases as time increases. For constant surface water content, the approximate solution reduces to a simple three parameter infiltration law for air and water.
886132 Analytical model of slug teats Karasaki, K; Long, J C S; Witherspoon, P A Water Resow Res V24, NI, Jan 1988. PII5126
886128 Origins of anisotropy Lake, L W J Pet Technol V40, N4, April 1988, P395-396 Permeability anisotropy causes fluid to flow in a direction different from that in which it is pushed. The effects, importance and representations of anisotropy are described. Numerical simulators do not show full effects of anisotropy as they use only 3 components, horizontal,lateral and vertical permeability. The causes of anisotropy in sands and shales are described, and problems incorporating anisotropy in calculations presented. 886129 Evaluation of the hydra&c monitoring measurements of three earth dams by a model of flow in a porous medium (In French) Gousse, F Rev Fr Geotech N43, 1988, P47-66 In service behaviour of three earth dams has been modelled using a 2D transient hydraulic mode1 of a porous medium (Humbert, 1984). Despite some global discrepancies between theory and field results, important information was gained. The transient model was more instructive than the steady state one. The hydraulic parameters of the unsaturated zone do not significantly i~uen~ the results of seepage anaIysis. An accurate deterministic seepage analysis requires the following: an affordable 3D transient flow model, better knowledge of soil hydraulic properties, and more reliable field measurements. 886130 Effect of assumed unit gradient during drainage on the determinationof unsaturated hydra& conductivity and lnlBtration parameters Ahuja, L R; Barnes, B 3; Cassel, D Ic; Bruce, R R; Nofziger, D L soil Sci V145, N4, April 1988, P23.5-243 The unit gradient approximation is introduced. Unsaturated hydraulic conductivjti~ and parameters in the Green-Ampt infiltration equation were determined using the approximation for four soils. Results are compared to those from rigorous Darcian analysis. Hydraulic conductivities in the topsoil determined using the approximation show greatest discrepancies from Darcian values. It is suggested that for near surface hydraulic conductivity determination, tensiometers are installed in the topsoil to measure hydraulic gradients, and Darcian analysis applied.
0
Slug tests are a cheap and simple method of estimating flow parameters of shallow aquifers and fractured rocks. Available analytical solutions are limited to a few ideal cases. A new analysis is presented for heterogeneous systems for the cases of linear flow, radial flow with boundaries, two layer, and concentration composite models with different flow geometries in the inner and outer regions. Type curves are presented for each case. Results suggest that slug tests suffer problems of non-uniqueness to a greater extent than other well tests. 886133 FInid mechanics of fractnre and other junctions Philip, J R Water ResorrrRes V24, N2, Feb 1988, P239-246 Fluid flow at a mode1 junction with four equal coplanar branches meeting at right angies, with two inlets and two outlets, is studied. Both Laplace and Stokes flows are analysed. Errors of proportional routing where the two inlet discharges and two outlet discharges differ greatly have been evaluated. 886134 Modeling of brine transport in porous media Hassanizadeh, S M; Leijnse, T Water Resmr Res V24, N3, March 1988, P321-330 Concentrated brine transport is important in transport of pollutants from a repository in a salt rock formation. A new formulation of the equations describing brine flow and salt transport is presented. Modified versions of Fick’s law and Darcy’s law are employed to account for the effects of high salt con~ntrations. Some possible boundary conditions appiicable to high concentration situations are examined and nonadmissable boundary conditions indicated. Suitable numerical schemes for solving the equations are discussed. 886135 C~tinu~ model for water move~t in an unity fractured rock mass Peters, R R, Klavetter, E A Wuter Resow Res V24, N3, March 1988, P416-430 The movement of fluids in a fractured porous medium is studied. A continuum model to evaluate isothermal movement under slowly changing conditions, primarily slowly changing matrix potential, has been developed for application to a pssible repository site at Yucca Mountain,which contains high and low conductivity nonwelded tuff and low conducti~ty highly porous tuff. Both macroscopic and microscopic approaches are used to calculate coefficients in the flow conductivity equation, and yield similar results.
1988 Pergamon Press plc. Reproduction
not permitted