A rapid spectrophotometric method for determination of persulfate in soil (2010)
Cunningham, C. J., Pitschi, V., Anderson, P., Barry, D. A., Patterson, C., Peshkur, T. A.
Chemical oxidation is most commonly applied in situ but may also be applied ex situ to treat contaminated soils. Standard methods for quantifying persulfate require either centrifugation or prolonged...
Tidal influence on BTEX biodegradation in sandy coastal aquifers (2009)
Robinson, C., Brovelli, A., Barry, D. A., Li, L.
A numerical study was conducted to investigate the influence of tides on the fate of terrestrially-derived BTEX discharging through an unconfined aquifer to coastal waters. Previous studies have...
Pollutant Fate and Transport in the Subsurface (2009)
Wissmeier, L., Brovelli, A., Robinson, C., Stagnitti, F., Barry, D. A.
Bioclogging in porous media: Model development and sensitivity to initial conditions (2009)
Brovelli, A., F. Malaguerra, F., Barry, D. A.
This work presents a numerical model able to simulate the effect of biomass growth on the hydraulic properties of saturated porous media, i.e., bioclogging. A new module for an existing coupled flow...
Effects of crab burrows on pore water flows in salt marshes (2009)
Xin, P., Jin, G., Li, L., Barry, D. A.
Macro-pores such as crab burrows are found commonly distributed in salt marsh sediments. Their disturbance on the soil structure is likely to influence both pore water flows and solute transport in...
Laboratory column experiments involving steady flow in homogeneous soil are often analyzed assuming that the flow is spatially uniform in any plane transverse to the longitudinal axis aligned with...
pH control for enhanced reductive bioremediation of chlorinated solvent source zones (2009)
Robinson, Clare, Barry, D. A., McCarty, Perry L., Gerhard, Jason I., Kouznetsova, Irina
Enhanced reductive dehalogenation is an attractive treatment technology for in situ remediation of chlorinated solvent DNAPL source areas. Reductive dehalogenation is an acid-forming process with...
To assist in the design of enhanced reductive dechlorination systems for in situ remediation of chlorinated solvent source zones, the software BUCHLORAC (BUffering of deCHLORination ACidity) was...
Barry, D. A., Lockington, D. A., Wissmeier, L.
A recent paper reported capillary rise and evaporation experiments in metallic wicks, as well as a mathematical model. The authors found a consistent discrepancy between the model predictions and...
Dissipation of boundary-induced flow disturbances in cylindrical soil columns (2009)
Laboratory soil column experiments, often involving steady flow, have a long and enduring history in hydrology and soil science. Typically, analyses of laboratory column data assume that the flow is...
Modelling carbon and nitrogen turnover in variably saturated soils (2009)
Batlle-Aguilar, J., Brovelli, A., Porporato, A., Barry, D.A.
Natural ecosystems provide services such as ameliorating the impacts of deleterious human activities on both surface and groundwater. For example, several studies have shown that a healthy riparian...
Micropollutants in urban watersheds : Substance flow analysis as management tool (2009)
Rossi, L, Copin, P J, Barry, D A, Bader, H-P, Scheidegger, R, Chèvre, N
HydroPix: a vision-based tool for the control of hydraulic structures in sewer systems. (2009)
Nguyen, L, Sage, D, Schaeli, B, Kayal, S, Rossi, L, Barry, D A
Barry, D. A., Wissmeier, L., Sander, G. C., Lockington, D. A.
The porous medium model of Green and Ampt, describing flow in porous media, appeared earlier than the capillary model of Washburn, although both lead to the mathematically identical models. The model...
Mailapalli et al. (2009) presented an explicit numerical scheme for calculation of solutions to the 1D Green and Ampt (1911) infiltration equation. They compared their numerical solution to a...
Extension of a recent method for obtaining exact solutions of the Bruce and Klute equation (2009)
Barry, D. A., Prevedello, C. L., Loyola, J. M. T., Reichardt, K., Nielsen, D. R.
A recent method based on a specific power-law relationship between the matric potential head and the Boltzmann variable was presented by Prevedello et. al. (2008). Here, this relationship was...
PHT3D – A MODFLOW/MT3DMS-based reactive multi-component transport model (2008)
H. Prommer, D. A. Barry, C. Zheng
PHT3D, a three-dimensional, MODFLOW/MT3DMS-based reactive multicomponent transport model is presented. The model couples, via an operator-splitting method, the transport simulator MT3DMS (Zheng and...
By implementing the moisture-based form of Richards' equation into the geochemical modelling framework PHREEQC, a generic tool for the simulation of one-dimensional flow and solute transport in the...
Pasandi, M., Samani, N., Barry, D. A.
An analytical model is presented for the analysis of constant flux tests conducted in a phreatic aquifer having a partially penetrating well with a finite thickness skin. The solution is derived in...
Parameter and process significance in mechanistic modeling of cellulose hydrolysis (2008)
Rotter, B. E., Barry, D. A., Gerhard, J. I., Small, J. S.
A process-based model relevant to landfill and anaerobic digesters was developed, which included a novel approach to biomass transfer between a cellulose-bound biofilm and biomass in the bulk liquid....
Alkalinity requirements for enhanced anaerobic TCE dehalogenation (2008)
Robinson, Clare, Barry, D.A., Gerhard, Jason, Kouznetsova, Irina
Detailed process interaction simulated in TCE DNAPL bioremediation column experiments (2008)
Kouznetsova, I., Gerhard, J.I., Mao, X., Robinson, C., Barry, D.A., Harkness, M., ...
Influence of sediment settling velocity on mechanistic soil erosion modeling (2008)
Barry, D. A., Tromp, M. F., Sander, G. C., Walter, M. T., ...
We report on a series of soil erosion experiments performed on the 2-m x 6-m EPFL erosion flume. Total sediment concentrations and the concentrations of seven size fractions (1000 mm) were measured...
Modeling U(VI) biomineralization in single- and dual- porosity porous media (2008)
Rotter, B. E., Barry, D. A., Gerhard, J. I., Small, J. S.
Uranium extraction, processing and storage have resulted in a legacy of uranium-contaminated groundwater aquifers worldwide. An emerging remediation technology for such sites is the in situ...
Influence of sediment settling velocity on mechanistic soil erosion modeling (2008)
Parlange, J Y, Barry, D A, Tromp, M F, Sander, G C, Walter, M T, ...
We report on a series of soil erosion experiments performed on the $2-m \times 6-m$ EPFL erosion flume. Total sediment concentrations and the concentrations of seven size fractions (<2,...
Limitation of the transport capacity approach in sediment transport modeling (2007)
Sander, G. C., Barry, D. A., Parlange, M. B., Hogarth, W. L.
In a recent paper by Polyakov and Nearing (2003) it was shown experimentally that the sediment transport capacity in a rill is not unique for a given soil type, slope, and flow rate. Indeed, they...
Analytical approximations for flow in compressible, saturated, one-dimensional porous media (2007)
Barry, D. A., Lockington, D. A., Li, L., Stagnitti, F.
A nonlinear model for single-phase fluid flow in slightly compressible porous media is presented and solved approximately. The model assumes state equations for density, porosity, viscosity and...
Effect of tidal forcing on a subterranean estuary (2007)
Robinson, C., Li, L., Barry, D. A.
Groundwater flow and chemical transport in subterranean estuaries are poorly understood despite their potentially important implications for chemical fluxes from aquifers to coastal waters. Here, a...
Numerical modeling of tidal influence on density-dependent contaminant transport (2007)
Brovelli, A., Mao, X., Barry, D. A.
Transport of contaminants in coastal aquifers subject to tidal fluctuation is an important topic in hydrogeology as a consequence of the significant development of human activities near the...
Anaerobic biodegradation of linear alkylbenzene: Isomeric ratio as a monitoring tool (2007)
Johnson, S. J., Barry, D. A., Christofi, N.
Linear alkylbenzenes (LABs) are common environmental contaminants associated with a range of industrial and domestic activities. Although natural environments receiving LABs may exhibit a range of...
Process-based modeling of constructed wetlands (2007)
Baechler, S., Brovelli, A., Rossi, L., Barry, D. A.
Fall meeting
Comprehensive model for enhanced biodegradation of chlorinated solvents in groundwater (2007)
Kouznetsova, I., Gerhard, J. I., Mao, X., Robinson, C., Barry, D. A., Herkness, M., ...
Effect of tidal forcing on a subterranean estuary (2007)
Robinson, C., Li, L., Barry, D.A.
Groundwater flow and chemical transport in subterranean estuaries are poorly understood despite their potentially important implications for chemical fluxes from aquifers to coastal waters. Here, a...
Analytical approximations for flow in compressible, saturated, one-dimensional porous media (2007)
Barry, D.A., Lockington, D.A., Jeng, D.S., Parlange, J.Y., Li, L., Stagnitti, F.
A nonlinear model for single-phase fluid flow in slightly compressible porous media is presented and solved approximately. The model assumes state equations for density, porosity, viscosity and...
Hydro-geochemical Modelling of Bauxite Residue: Managing the legacy of alumina production (2007)
Wissmeier, L., Barry, D.A., Phillips, I., Carter, Ch.
In the bauxite refining Bayer’s process, about 8 x 107 t/y of problematic residue is produced worldwide by extraction of alumina from bauxite earth. The bauxite refining industry requires...
Tidal influence on behaviour of a coastal aquifer adjacent to a low-relief estuary (2006)
Mao, X., Enot, P., Barry, D. A., Li, L., Binley, Andrew M.
The tidal influence on groundwater hydrodynamics, salt-water intrusion and submarine groundwater discharge from coastal/estuarine aquifers is poorly quantified for systems with a mildly sloping...
ENSO forcing on climate change in Iran: Precipitation analysis. (2006)
Nazemosadat, M. J., Samani, N., Barry, D. A., Molaii Niko. M.
An investigation was conducted to detect the change-point years in the Southern Oscillation Index (SOI) and precipitation time series in Iran for the period 1951-1999 (49 years). Due to the...
Tidal influence on behaviour of a coastal aquifer adjacent to a low-relief estuary (2006)
Mao, X., Enot, P., Barry, D. A., Li, L., Binley, A.
The tidal influence on groundwater hydrodynamics, salt- water intrusion and submarine groundwater discharge from coastal/estuarine aquifers is poorly quantified for systems with a mildly sloping...
Flow to horizontal drains in isotropic unconfined aquifers (2006)
Samani, N., Kompani-Zare, M., Seyyedian, H., Barry, D. A.
The Laplace-transform solution for the problem of flow to horizontal drains in an anisotropic unconfined aquifer is derived. The solution for the constant flux horizontal-well by Zhan and Zlotnik...
Liu, X., Mao, X., Yang, J., Barry, D. A., Li, L.
Pollution by polycyclic aromatic hydrocarbons (PAHs) is widespread due to unsuitable disposal of industrial waste. They are mostly defined as priority pollutants by environmental protection...
Mao, X., Prommer, H., Barry, D. A., Langevin, C. D., Panteleit, B., Li, L.
PHWAT is a new model that couples a geochemical reaction model (PHREEQC-2) with a density-dependent groundwater flow and solute transport model (SEAWAT) using the split- operator approach. PHWAT was...
Samani, N., Pasandi, M., Barry, D. A.
Evaluation of aquifer yields with the conventional time- drawdown method is based on the assumption of Theisian or infinite radial flow (IRF) of ground water to a well. However, long-term aquifer...
Steenhuis, T. S., DiCarlo, D. A., Selker, J. S., Nektarios, P. A., ...
More than ever before, a compelling need exists for an encyclopedic resource about soil – the rich mix of mineral particles, organic matter, gases, and soluble compounds that foster both plant and...
Modeling bioremediation of contaminated groundwater (2005)
Bioremediation: Applied Microbial Solutions for Real-World Environmental Cleanup is a fascinating examination of research and its real-world application. Intended for both academics and...
Two-dimensional approximation for tidal dynamics in coastal aquifers: Capillarity correction (2005)
Teo, H. T., Barry, D. A., Li, L.
Most previous investigations on tide-induced watertable fluctuations in coastal aquifers have been based on one- dimensional models that describe the processes in the cross- shore direction alone,...
Steepness expansion for free surface flows in coastal aquifers (2005)
Seymour, B. R., Barry, D. A., Lockington, D. A., Li, L.
Free surface flow of groundwater in aquifers has been studied since the early 1960s. Previous investigations have been based on the Boussinesq equation, derived from the non- linear kinematic...
Su, N., Sander, G. C., Liu, F., Anh, V., Barry, D. A.
A specific form of the Fokker–Planck equation with a time- and scale-dependent dispersivity is presented for modelling solute transport in saturated heterogeneous porous media. By taking a...
Green-Ampt approximations (2005)
Barry, D. A., Li, L., Crapper, M.
The solution to the Green and Ampt infiltration equation is expressible in terms of the Lambert W-1 function. Approximations for Green and Ampt infiltration are thus derivable from approximations for...
New approximation for free surface flow of groundwater: Capillary correction (2005)
Seymour, B. R., Barry, D. A., Li, L.
An existing capillarity correction for free surface groundwater flow as modelled by the Boussinesq equation is re-investigated. Existing solutions, based on the shallow flow expansion, have...
Similarity solution of axisymmetric flow in porous media (2005)
Li, L., Lockington, D.A., Parlange, M.B., Stagnitti, F., Selker, J.S., ...
Applications of the axisymmetric Boussinesq equation to groundwater hydrology and reservoir engineering have long been recognised. An archetypal example is invasion by drilling fluid into a permeable...
Biodegradation of pyrene and phenanthrene in soil using immobilized fungi Fusarium sp (2005)
Li, P., Li, H., Stagnitti, F., Wang, X., Zhang, H., Gong, Z., ...
Similarity solution of axisymmetric flow in porous media (2005)
Li, L., Lockington, D. A., Parlange, M. B., Stagnitti, F., Selker, J. S., ...
Applications of the axisymmetric Boussinesq equation to groundwater hydrology and reservoir engineering have long been recognised. An archetypal example is invasion by drilling fluid into a permeable...
Seymour, B. R., Barry, D. A., Dong, P., Li, L.
The prediction of watertable fluctuations in a coastal aquifer is important for coastal management. However, most previous approaches have based on the one-dimensional Boussinesq equation, neglecting...
Spring-neap tide-induced beach water table fluctuations in a sloping coastal aquifer (2005)
Mao, X., Enot, P., Barry, D. A., Li, L.
Predictions of water table fluctuations in coastal aquifers are needed for numerous coastal and water resources engineering problems. Most previous investigations have been based on the Boussinesq...
Sander, G. C., Liu, Fawang., Barry, D. A., Anh, Vo.
A specific form of the Fokker–Planck equation with a time- and scale-dependent dispersivity is presented for modelling solute transport in saturated heterogeneous porous media. By taking a...
Mao, X., Enot, P., Barry, D. A., Li, L., Binlet, A.
In this study, we investigated the effect of beach slope for a coastal aquifer adjacent to a low-relief estuary. The waste was suspected to discharge leachate towards the estuary. Field observations...
Similarity solution of axisymmetric flow in porous media (2005)
Li, L., Lockington, D. A., Parlange, M. B., Stagnitti, Frank, Jeng, D. S., Selker, J. S., ...
Applications of the axisymmetric Boussinesq equation to groundwater hydrology and reservoir engineering have long been recognised. An archetypal example is invasion by drilling fluid into a permeable...
Biodegradation of pyrene and phenanthrene in soil using immobilized fungi fusarium sp. (2005)
Li, P., Li, H., Stagnitti, Frank, Wang, X., Zhang, H., Gong, Z., ...
Su, Ninghu, Sander, G.C., Liu, Fawang, Anh, Vo, Barry, D.A.
A specific form of the Fokker–Planck equation with a time- and scale-dependent dispersivity is presented for modelling solute transport in saturated heterogeneous porous media. By taking a...
Similarity solution of axisymmetric flow in porous media (2005)
Li, L., Lockington, D. A., Parlange, M. B., Stagnitti, F., Jeng, D. S., Selker, J., ...
Applications of the axisymmetric Boussinesq equation to groundwater hydrology and reservoir engineering have long been recognised. An archetypal example is invasion by drilling fluid into a permeable...
Steepness expansion for free surface flows in coastal aquifers (2005)
Jeng, D. S., Seymour, B. R., Barry, D. A., Parlange, J. Y., Lockington, D. A., Li, L.
Free surface flow of groundwater in aquifers has been studied since the early 1960s. Previous investigations have been based on the Boussinesq equation, derived from the non-linear kinematic boundary...
Su, Ninghu., Sander, G. C., Liu, Fawang., Barry, D. A., Anh, Vo.
A specific form of the Fokker–Planck equation with a time- and scale-dependent dispersivity is presented for modelling solute transport in saturated heterogeneous porous media. By taking a...
Similarity solution of axisymmetric flow in porous media (2005)
Li, L., Lockington, D. A., Parlange, M. B., Stagnitti, Frank, Jeng, D. S., Selker, J. S., ...
Applications of the axisymmetric Boussinesq equation to groundwater hydrology and reservoir engineering have long been recognised. An archetypal example is invasion by drilling fluid into a permeable...
Biodegradation of pyrene and phenanthrene in soil using immobilized fungi fusarium sp. (2005)
Li, P., Li, H., Stagnitti, Frank, Wang, X., Zhang, H., Gong, Z., ...
Drying front in a sloping aquifer: Nonlinear effects (2004)
Stagnitti, F., Li, L., Brutsaert, W., Lockington, D. A., Steenhuis, T. S., ...
Tidal dynamics of groundwater flow and contaminant transport in coastal aquifers, In (2004)
Li, L., Barry, D. A., Prommer, H.
Approximately 70% of the world's population lives in coastal areas, and the majority of these people depend on coastal aquifers for freshwater. The fragility of these aquifers and their sensitivity...
MODFLOW equipped with a new method for the accurate simulation of axisymmetric flow (2004)
Samani, N., Kompani-Zarea, M., Barry, D. A.
Axisymmetric flow to a well is an important topic of groundwater hydraulics, the simulation of which depends on accurate computation of head gradients. Groundwater numerical models with conventional...
Field trial of a new aeration system for enhancing biodegradation in a biopile (2004)
Li, L., Cunningham, C. J., Pas, V., Philp, J. C., Barry, D. A., Anderson, P.
The influence of a new aeration system on the biopile performance was investigated. The purpose was to increase biodegradation efficiency by optimising airflow through the pile. During a 1-month...
Drying front in a sloping aquifer: Nonlinear effects (2004)
Stagnitti, F., Li, L., Brutsaert, W., Lockington, D. A., Steenhuis, T. S., ...
The profiles for the water table height h(x, t) in a shallow sloping aquifer are reexamined with a solution of the nonlinear Boussinesq equation. We demonstrate that the previous anomaly first...
Hogarth, W. L., Rose, C. W., Sander, G. C., Steenhuis, T. S., Barry, D. A.
An approximate analytical solution is obtained for a physically based model of soil erosion on a gentle slope driven by rainfall impact in which there is inflow of clear or nearly clear water to the...
Modelling the fate of chromated copper arsenate in a sandy soil (2004)
Mao, X., Barry, D. A., Li, L., Stagnitti, F., Allinson, G., Turoczy, N.
A pulse of chromated copper arsenate (CCA, a timber preservative) was applied in irrigation water to an undisturbed field soil in a laboratory column. Concentrations of various elements in the...
A robust grade adjustment procedure (2004)
Barry, D. A., Wardlaw, R. B., Crapper, M., Smith, S. D.
Assurance of equity in student outcomes includes ensuring that module results are comparable within reasonable bounds. We present a procedure that first compares (and adjusts if necessary) module...
Groundwater maintains dune landscape (2004)
Chen, J. S., Li, L., Wang, J. Y., Barry, D. A., Sheng, X. F., Gu, W. Z., ...
Reply to the “Comments on ‘On an exact analytical solution of the Boussinesq equation’” (2004)
Barry, D. A., Hogarth, W. L., Govindaraju, R. S., Parlange, M. B., Lockington, D.
The Lambert W function appears in a wide variety of circumstances, including the recent application to signal processing referred to in the paper under discussion. Besides applications, a sizable...
Drying front in a sloping aquifier: nonlinear effects (2004)
Stagnitti, Frank, Li, Ling, Parlange, J.-Yves, Brutsaert, Wilfried, Lockington, David A., Steenhuis, Tammo S., ...
The profiles for the water table height h(x, t) in a shallow sloping aquifer are reexamined with a solution of the nonlinear Boussinesq equation. We demonstrate that the previous anomaly first...
Drying front in a sloping aquifier: nonlinear effects (2004)
Stagnitti, Frank, Li, Ling, Parlange, J.-Yves, Brutsaert, Wilfried, Lockington, David A., Steenhuis, Tammo S., ...
The profiles for the water table height h(x, t) in a shallow sloping aquifer are reexamined with a solution of the nonlinear Boussinesq equation. We demonstrate that the previous anomaly first...
Modelling the fate of chromated copper arsenate in a sandy soil (2004)
Mao, X., Barry, D. A., Li, L., Stagnitti, Frank, Allinson, G., Turoczy, N.
A pulse of chromated copper arsenate (CCA, a timber preservative) was applied in irrigation water to an undisturbed field soil in a laboratory column. Concentrations of various elements in the...
Barry, D. A., Li, L., Jeng, D. S
The Lambert W function appears in a wide variety of circumstances, including the recent application to signal processing referred to in the paper under discussion. Besides applications, a sizable...
New approximation for free surface flow of groundwater in coastal aquifers (2004)
Jeng, D.S., Seymour, B.R., Barry, D.A., Li, L., Parlange, J-Y
Drying front in a sloping aquifier: nonlinear effects (2004)
Stagnitti, Frank, Li, Ling, Parlange, J.-Yves, Brutsaert, Wilfried, Lockington, David A., Steenhuis, Tammo S., ...
The profiles for the water table height h(x, t) in a shallow sloping aquifer are reexamined with a solution of the nonlinear Boussinesq equation. We demonstrate that the previous anomaly first...
Modelling the fate of chromated copper arsenate in a sandy soil (2004)
Mao, X., Barry, D. A., Li, L., Stagnitti, Frank, Allinson, G., Turoczy, N.
A pulse of chromated copper arsenate (CCA, a timber preservative) was applied in irrigation water to an undisturbed field soil in a laboratory column. Concentrations of various elements in the...
Solute and contaminant transport in heterogeneous soils (2003)
Stagnitti, F., Villiers, N., Parlange, J.Y., Steenhuis, T.S., Li, L., ...
Barry, D. A., Prommer, H., Miller, C. T., Engesgaard, P., Brun, A., Zheng, C.
Subsurface contamination by organic chemicals is a pervasive environmental problem, susceptible to remediation by natural or enhanced attenuation approaches or more highly engineered methods such as...
Explicit infiltration equations and the Lambert W-function (2003)
The Green and Ampt infiltration formula, as well as the Talsma and Parlange formula, are two-parameter equations that are both expressible in terms of Lambert W-functions. These representations are...
Groundwater dynamics in coastal aquifers: Moving boundary. (2003)
Teo, H. T., Jeng, D. S., Seymour, B. R., Barry, D. A., Li, L.
Confined-unconfined flow in a horizontal confined aquifer (2003)
Li, L., Lockington, D. A., Barry, D. A., Perrochet, P.
Mixed confined and unconfined groundwater flow occurs in a bounded initially dry aquifer when the hydraulic head at the side boundary suddenly rises above the elevation of the aquifer’s top...
Kanney, J. F., Miller, C. T., Barry, D. A.
The purpose of this work is to evaluate the computational efficiency of fully coupled approaches for approximating a common class of nonlinear, two-phase advective–dispersive– reactive equations....
MODFLOW/MT3DMS-based reactive multi-component transport modeling (2003)
Prommer, H., Barry, D. A., Zheng, C.
This paper presents a three-dimensional, MODFLOW/MT3DMS- based reactive multicomponent transport model for saturated porous media. Based on a split-operator technique, the model, referred to as...
Drying of porous building materials: Hydraulic diffusivity and front propagation (2003)
Lockington, D. A., Barry, D. A., Leech, C.
One-dimensional drying of a porous building material is modelled as a nonlinear diffusion process. The most difficult case of strong surface drying when an internal drying front is created is treated...
Solute and contaminant transport in heterogeneous soils (2003)
Stagnitti, F., Villiers, N., Steenhuis, T. S., De Rooij, G. H., Li, L., ...
Contribution of anaerobic microbial activity to natural attenuation of benzene in groundwater (2003)
Johnson, S. J., Woolhouse, K. J., Prommer, H., Barry, D. A., Christofi, N.
Anaerobic biodegradation of hydrocarbons, using a variety of terminal electron acceptors (TEAs), is increasingly being reported both in laboratory studies and in the field. Of all the petroleum...
Teo, H. T., Jeng, D. S., Seymour, B. R., Barry, D. A., Li, L.
The Boussinesq equation appears as the zeroth-order term in the shallow water flow expansion of the non-linear equation describing the flow of fluid in an unconfined aquifer. One- dimensional models...
Optimisation and assessment of different railway ballast cleaning systems (2003)
Anderson, P., Cunningham, C. J., Hearnden, R. A., Barry, D. A., Philp, J. C.
Spent railway ballast is a source of recycled aggregate. Recycling of aggregates contributes to sustainable development by reducing the volume of construction waste going to landfill, reducing...
Confined-unconfined flow in a horizontal confined aquifer (2003)
Li, Ling, Lockington, D. A., Barry, D. A., Parlange, J. Y., Perrochet, P.
Mixed confined and unconfined groundwater flow occurs in a bounded initially dry aquifer when the hydraulic head at the side boundary suddenly rises above the elevation of the aquifer's top boundary....
Teo, Liza, Jeng, Dong Sheng, Seymour, B. R., Barry, D. A., Li, L.
The Boussinesq equation appears as the zeroth-order term in the shallow water flow expansion of the non-linear equation describing the flow of fluid in an unconfined aquifer. One-dimensional models...
BeachWin: Modelling groundwater effects on swash sediment transport and beach profile changes (2002)
Li, L., Barry, D. A., Pattiaratchi, C. B., Masselink, G.
Field and laboratory observations have shown that a relatively low beach groundwater table enhances beach accretion. These observations have led to the beach dewatering technique (artificially...
Preferential flow of a nonaqueous phase liquid in dry sand (2002)
Culligan, P. J., Banno, K., Barry, D. A., Steenhuis, T. S.
Geotechnical centrifuge testing is used to examine the preferential (fingered) flow of a nonaqueous phase liquid (NAPL) in a uniform dry sand. The results of nine experiments, containing a total of...
Watson, S. J., Barry, D. A., Schotting, R. J., Hassanizadeh, S. M.
Recently, it has been suggested that Darcy's Law might not be applicable for modelling miscible, density-dependent flow in porous media. To investigate this, three sets of careful laboratory column...
An analytical solution is derived for tidal fluctuations in a coupled coastal aquifer system consisting of a semi- confined aquifer, a thin semi-permeable layer and a phreatic aquifer. Based on the...
Recirculation within a fluid sphere at moderate Reynolds numbers (2002)
Motion of a single fluid sphere is described by two theories, each characterized by different levels of Hill's vortex circulation within the sphere. An existing experimental data set giving...
Anderson, P., Cunningham, C. J., Barry, D. A.
Railway ballast consists of crushed aggregate and serves as foundation and drainage for railway tracks. Over time, ballast loses its geotechnical properties and cannot be reused within the rail...
Watson, S. J., Barry, D. A., Schotting, R. J., Hassanizadeh, S. M.
A series of careful laboratory soil column experiments was carried out for the purpose of providing data for testing recently presented theories of miscible density-dependent flow and transport. In...
Damping of tidal head fluctuations in a leaky confined coastal aquifer is enhanced by leakage into an overlying phreatic aquifer. We show that the phreatic aquifer is, however, resistant to the...
Tide-induced water table fluctuations in coastal aquifers bounded by rhythmic shorelines (2002)
Li, L., Dong, P., Barry, D. A.
Previous studies on tidal water table dynamics in unconfined coastal aquifers have focused on the inland propagation of oceanic tides in the cross-shore direction based on the assumption of a...
Prommer, H., Barry, D. A., Davis, G. B.
Numerical experiments of non-reactive and reactive transport were carried out to quantify the influence of a seasonally varying, transient flow field on transport and natural attenuation at a...
Cadmium desorption in sand (2002)
Tran, Y. T., Barry, D. A., Bajracharya, K.
Desorption of cadmium (Cd) from sand was studied by both batch and flow-through methods. Batch experiments were conducted at three pH values (5.5, 6.0 and 6.5). In each case, the amount of Cd...
Modelling the fate of oxidisable organic contaminants in groundwater (2002)
Barry, D. A., Prommer, H., Miller, C. T., Engesgaard, P., Brun, A., Zheng, C.
Subsurface contamination by organic chemicals is a pervasive environmental problem, susceptible to remediation by natural or enhanced attenuation approaches or more highly engineered methods such as...
Explicit infiltration equations and the Lambert W-function (2002)
The Green and Ampt infiltration formula, as well as the Talsma and Parlange formula, are two-parameter equations that are both expressible in terms of Lambert W-functions. These representations are...
Barry, D. A., Lisle, I. G., Li, L., Stagnitti, F., ...
We attempt to generate new solutions for the moisture content form of the one-dimensional Richards' [1931] equation using the Lisle [1992] equivalence mapping. This mapping is used as no more general...
Modelling the fate of oxidisable organic contaminants in groundwater (2002)
Barry, D. A., Prommer, H., Miller, C. T., Engesgaard, P., Brun, A., Zheng, C.
Subsurface contamination by organic chemicals is a pervasive environmental problem, susceptible to remediation by natural or enhanced attenuation approaches or more highly engineered methods such as...
Tide-induced water table fluctuations in coastal aquifers bounded by rhythmic shorelines (2002)
Li, L., Dong, P., Barry, D. A.
Previous studies on tidal water table dynamics in unconfined coastal aquifers have focused on the inland propagation of oceanic tides in the cross-shore direction based on the assumption of a...
Tide-induced water table fluctuations in coastal aquifers bounded by rhythmic shorelines (2002)
Li, L., Dong, P., Barry, D. A.
Previous studies on tidal water table dynamics in unconfined coastal aquifers have focused on the inland propagation of oceanic tides in the cross-shore direction based on the assumption of a...
Analytical solution for tidal propagation in a coupled semi-confined/phreatic coastal aquifer (2002)
Jeng, Dong Sheng, Li, L., Barry, D. A.
An analytical solution is derived for tidal fluctuations in a coupled coastal aquifer system consisting of a semi-confined aquifer, a thin semi-permeable layer and a phreatic aquifer. Based on the...
Sudden drawdown and drainage of a horizontal aquifer (2001)
Stagnitti, F., Heilig, A., Szilagyi, J., Parlange, M. B., Steenhuis, T. S., ...
Comments on 'Exact solution for horizontal redistribution by general similarity' (2001)
Lockington, D., Sander, G., Hogarth, W. L., Barry, D. A., Li, L., ...
Water wave-driven seepage in marine sediments (2001)
Jeng, D. S., Barry, D. A., Li, L.
The action of water waves moving over a porous seabed drives a seepage flux into and out of the marine sediments. The volume of fluid exchange per wave cycle may affect the rate of contaminant...
A numerical modelling approach, used for the analysis of stable brine displacement results, is described. The purpose of the analysis is to evaluate recent theoretical advances in modelling of...
Tidal fluctuations in a leaky confined coastal aquifer are damped significantly due to leakage into an overlying phreatic aquifer. Jiao and Tang [1999] presented an analytical solution to a simple...
Modelling solute transport in structured soils: Performance evaluation of ADR and TRM models (2001)
Stagnitti, F., Li, L., Barry, D. A., Allinson, G., Steenhuis, T., ...
The movement of chemicals through the soil to the groundwater or discharged to surface waters represents a degradation of these resources. In many cases, serious human and stock health implications...
Wave-induced seepage flux into anisotropic seabeds (2001)
Jeng, D. S., Li, L., Barry, D. A.
Considerable effort has been devoted to quantifying the wave-induced soil response in a porous seabed in the last few decades. Most previous investigations have focused on the analysis of pore...
Sudden drawdown and drainage of a horizontal aquifer. (2001)
Stagnitti, F., Heilig, A., Szilagyi, J., Parlange, M. B., Steenhuis, T. S., ...
Drainage of a saturated horizontal aquifer following a sudden drawdown is reanalyzed using the Boussinesq equation. The effect of the finite length of the aquifer is considered in detail. An...
Johnson, S. J., Barry, D. A., Christofi, N., Patel, D.
Linear alkylbenzene (LAB) cable oils are used for the electrical insulation of high-voltage underground power cables. Due to thermal movement of the cables, leaks can occur at the joints, resulting...
WEC-C: A distributed, deterministic catchment model - theory, formulation and testing (2001)
WEC-C is a distributed. deterministic, catchment-scale water flow and solute transport model containing a number of innovations not present in comparable models. For example, it allows for the...
Similitude applied to centrifugal scaling of unsaturated flow (2001)
Barry, D. A., Lisle, I. G., Li, L., Prommer, H., Sander, G. C., ...
Centrifuge experiments modeling single-phase flow in prototype porous media typically use the same porous medium and permeant. Then, well-known scaling laws are used to transfer the results to the...
Comments on “Exact solution for horizontal redistribution by general similarity” (2001)
Lockington, D., Sander, G., Hogarth, W. L., Barry, D. A., Li, L., ...
Sudden drawdown and drainage of a horizontal aquifer (2001)
Parlange, J. Y., Stagnitti, Frank, Heilig, A., Szilagyi, J., Parlange, M. B., Steenhuis, T. S., ...
Drainage of a saturated horizontal aquifer following a sudden drawdown is reanalyzed using the Boussinesq equation. The effect of the finite length of the aquifer is considered in detail. An...
Sudden drawdown and drainage of a horizontal aquifer (2001)
Parlange, J. Y., Stagnitti, Frank, Heilig, A., Szilagyi, J., Parlange, M. B., Steenhuis, T. S., ...
Drainage of a saturated horizontal aquifer following a sudden drawdown is reanalyzed using the Boussinesq equation. The effect of the finite length of the aquifer is considered in detail. An...
Wave-induced beach groundwater flow (2000)
Wave-induced beach groundwater flow has been linked to sediment transport in the near-shore zone and chemical transfer from the aquifer to the ocean. The flow dynamics, however, are not...
Li, L., Barry, D. A., Stagnitti, F.
Groundwater waves, that is, water table fluctuations, are a natural phenomenon in coastal aquifers. They represent an important part of the interaction between the ocean and aquifer and affect the...
Approximation for the exponential integral (Theis well function) (2000)
In this note, we provide an analytical approximation to the exponential integral valid for all values of its argument. The approximation is constructed by interpolation between the exponential...
Infiltration with controlled air escape (2000)
Culligan, P. J., Barry, D. A., Steenhuis, T. S., Haverkamp, R.
Infiltration into the soil is restricted if the movement of displaced air is hampered. In this study, separate infiltration experiments were performed where the air could escape only through...
Numerical modelling for design and evaluation of groundwater remediation schemes (2000)
Prommer, H., Barry, D. A., Davis, G. B.
The growth in readily available computational resources has led to increasingly sophisticated numerical models of biologically mediated, reactive chemical transport in aquifers. Such models are able...
Gravimetric analysis of organic contamination in railway ballast (2000)
Anderson, P., Cunningham, C. J., Barry, D. A.
Railway ballast provides both the foundation and drainage for railway track. It can become heavily contaminated with diesel fuel due to leakage and spillage. Typical analytical methods for soils may...
Beach water table fluctuations due to spring-neap tides: Moving boundary effects (2000)
Li, L., Barry, D. A., Stagnitti, F.
Tidal water table fluctuations in a coastal aquifer are driven by tides on a moving boundary that varies with the beach slope. One-dimensional models based on the Boussinesq equation are often used...
Li, L., Barry, D. A., Cunningham, C., Stagnitti, F.
Previous studies on tidal dynamics of coastal aquifers have focussed on the inland propagation of oceanic tides in the cross-shore direction, a configuration that is essentially one-dimensional....
Biogeochemical transport modelling of natural and enhanced remediation processes in aquifers (2000)
Prommer, H., Davis, G. B., Barry, D. A.
PHT3D, a three-dimensional biogeochemical tool for natural and enhanced remediation of organic compounds in saturated porous media, is presented. The model is based on four modules: a...
Analytical approximations for real values of the Lambert W- function (2000)
Barry, D. A., Li, L., Prommer, H., Cunningham, C. J., Stagnitti, F.
The Lambert W is a transcendental function defined by solutions of the equation W exp(W) = x. For real values of the argument, x, the W-function has two branches, W-0 (the principal branch) and W-1...
Barry, D. A., Bajracharya, K., Crapper, M., Prommer, H., Cunningham, C. J.
Numerical models of reactive solute transport in groundwater are often solved using an approximate two-step approach that separates the transport and reaction processes. Even though the transport and...
Barry, D. A., Parlange, J. Y., Hogarth, W. L., Govindaraju, R. S., Parlange, M. B., Lockington, D., ...
Beach water table fluctuations due to spring-neap tides: The moving boundary effects (2000)
Jeng, Dong Sheng, Li, L., Barry, D.A., Stagnitti, F., Parlange, J.Y.
Tidal water table fluctuations in a coastal aquifer are driven by tides on a moving boundary that varies with the beach slope. One-dimensional models based on the Boussinesq equation are often used...
Sorption-desorption equilibria and dynamics of Cadmium during transport in soil.In (1999)
Kookana, R. S., Naidu, R., Barry, D. A., Tran, Y. T., Bajracharya, K.
The chapters of this book were originally presented at the Fourth International Conference on the Biogeochemistry of Trace Elements, in June 1997 at Berkeley, California. The results of that...
Soil properties and water movement (1999)
Steenhuis, T. S., Haverkamp, R., Barry, D. A., Culligan, P. J., Hogarth, W. L., ...
The vadose zone is the region between ground level and the upper limits of soil fully saturated with water. Hydrology in the zone is complex: nonlinear physical, chemical, and biological interactions...
Prommer, H., Barry, D. A., Davis, G. B.
A one-dimensional (1-D) multi-component model accounting for hydrological transport inorganic equilibrium chemistry and microbial activity during kinetically controlled biodegradation in groundwater...
Analysis of continuous and pulsed pumping of a phreatic aquifer (1999)
Zhang, H., Barry, D. A., Hocking, G. C.
In a phreatic aquifer, fresh water is withdrawn by pumping from a recovery well. As is the case here, the interfacial surface (air/water) is typically assumed to be a sharp boundary between the...
Centrifuge modeling of unstable infiltration and solute transport (1999)
Griffioen, J. W., Barry, D. A.
Unstable flow can result in the formation of fingers during infiltration into dry soil. Centrifuge modeling is a potentially useful tool to study the relationship between finger size, spacing, and...
Prommer, H., Davis, G. B., Barry, D. A.
Sediment analysis using wet extraction techniques and model simulations were carried out to investigate the role of ferric iron during biodegradation of dissolved petroleum hydrocarbon compounds at a...
Tidal along-shore groundwater flow in a coastal aquifer (1999)
Li, L., Barry, D. A., Stagnitti, F.
Cross-shore interactions between the ocean and a coastal aquifer have been studied extensively, whereas the corresponding along-shore case has seldom been examined. This paper presents a numerical...
Approximations for the Hantush M function (1999)
A recent paper (Trefry, M.G., 1998. Analytical series expressions for Hanhrsh's M and S functions. Water Resour. Res. 34, 909-913) provided several interesting results concerning the Hantush M...
CXTANNEAL: An improved program for estimating solute transport parameters. (1999)
Li, L., Barry, D. A., Morris, J., Stagnitti, F.
CXTANNEAL is a program for analysing contaminant transport in soils. The code, written in Fortran 77, is a modified version of CXTFIT, a commonly used package for estimating solute transport...
Hogarth, W. L., Barry, D. A., Parlange, M. B., Haverkamp, R., Ross, P. J., ...
A recent approach to solve Richards' equation is further improved. This approach brings understanding into the physical processes of infiltration and pending. In particular we apply it to analyze the...
Submarine groundwater discharge and associated chemical input to a coastal sea (1999)
Li, L., Barry, D. A., Stagnitti, F.
This paper presents a theoretical model of flow and chemical transport processes in subterranean estuaries (unconfined brackish groundwater aquifers at the ocean-land interface). The model shows that...
Centrifuge modelling of solute transport during partially saturated flow (1999)
Griffioen, J. W., Barry, D. A.
The concept of “mobile” and “immobile” fluid regions (as incorporated in the Two-Region Model, TRM) is often used in the governing equation to model tailing in solute breakthrough curves...
Interpretation of two-region model parameters (1998)
Griffioen, J. W., Barry, D. A.
Apart from advection and diffusion/dispersion, other physical and chemical processes can affect the movement of solute through a porous medium. The classical advection- dispersion equation does not...
Benker, E., Davis, G. B., Barry, D. A.
Significant groundwater contamination by trichloroethene (TCE) has been identified in the Spearwood Sands aquifer, Perth Western Australia. The organic carbon content of the aquifer sediment is very...
Hogarth, W. L., Parlange, M. B., Haverkamp, R., Barry, D. A., Ross, P. J., ...
A general approximation for the solution of the one- dimensional nonlinear diffusion equation is presented. It applies to arbitrary soil properties and boundary conditions. The approximation becomes...
Steffy, D. A., Johnston, C. D., Barry, D. A.
Long-column laboratory tests were performed to validate improvements to the MOFAT program for simulating LNAPL displacement and entrapment in response to a fluctuating water table. The long-column...
Anomalous cadmium adsorption in flow interruption experiments. (1998)
Tran, Y. T., Bajracharya, K., Barry, D. A.
Adsorption of cadmium (Cd) onto fine sand was investigated using batch (static) and steady flow (dynamic) experiments at pHs of 5.5, 6.0 and 6.5. For both types of experiment, adsorption of Cd onto...
Similitude requirements for modelling NAPL movement with a geotechnical centrifuge. (1998)
The scaled modelling of non-aqueous phase liquid (NAPL) transport in porous media is examined with particular reference to the use of a geotechnical centrifuge as a tool for modelling this...
Barry, D. A., Parlange, M. B., Hogarth, W. L., Haverkamp, R., Ross, P. J., ...
A general approximation for the solution to the one-dimensional Richards equation is presented. It applies to arbitrary soil properties and boundary conditions but only uniform initial conditions at...
Contaminant transport in structured soil systems is often characterised by early and asymmetric breakthrough curves. These phenomena are usually interpreted using the mobile/immobile region model,...
Barry, D. A., Parlange, M. B., Hogarth, W. L., Haverkamp, R., Ross, P. J., ...
A general approximation for the solution to the one- dimensional Richards equation is presented. It applies to arbitrary soil properties and boundary conditions but only uniform initial conditions at...
Numerical modelling of tide-induced beach water table fluctuations (1997)
Li, L., Barry, D. A., Pattiaratchi, C. B.
Field studies have shown that the elevation of the beach groundwater table varies with the tide and such variations affect significantly beach erosion or accretion. In this paper, we present a BEM...
Influence of antecedent moisture content on residual LNAPL saturation. (1997)
Steffy, D. A., Barry, D. A., Johnston, C. D.
In a water wet porous medium, the antecedent moisture content controls the entrapment of LNAPL at low capillary numbers. A two-phase retention cell study of entrapment was conducted for LNAPL water...
Beach water table fluctuations due to wave run-up: Capillarity effects. (1997)
Li, L., Barry, D. A., Pattiaratchi, C. B.
High-frequency beach water table fluctuations due to wave run-up and run-down have been observed in the field [Waddell, 1976]. Such fluctuations affect the infiltration/exfiltration process across...
Previous studies have proposed the first-order reliability method (FORM) as an approach to quantitative stochastic analysis of subsurface transport. Most of these considered only simple analytical...
Scaling unstable infiltration in the vadose zone. (1997)
This technical note examines the feasibility of physically modelling unstable water flow in the form of fingers in the vadose zone. A scaling analysis is performed based on published expressions for...
Accuracy criteria for linearised diffusion wave flood routing. (1997)
The spatial step size for the second-order accurate Muskingum-Cunge (M-C) method is determined by the spatial weighting factor. Both the spatial weighting factor and the time step must be selected...
Barry, D. A., Miller, C. T., Culligan, P. J., Bajracharya, K.
Coupled solute transport and reaction models are computationally demanding when multispecies, multidimensional simulations are considered. Split operator methods provide approximate solutions to the...
Zhang, H., Hocking, G. C., Barry, D. A.
Fluid withdrawn through a line sink from a layered fluid in a vertically confined porous medium is considered. A hodograph method is used to obtain the shape of the interface for a given sink...
Benker, E., Davis, G. B., Barry, D. A.
Groundwater underlying the Perth metropolitan area was found to be contaminated by extensive plumes of trichloroethene (TCE), ammonium and sulphate, and regions of high dissolved organic carbon...
Improved scaling technique for two-phase pressure- saturation relationships (1997)
Steffy, D. A., Barry, D. A., Johnston, C. D.
Current methods of scaling imbibition and drainage pressure- saturation data scale the capillary pressure head using ratios of surface tension, constant intrinsic contact angle, fluid density...
Richards' equation, the governing equation for single phase unsaturated flow in soil, is highly nonlinear and, consequently, is difficult to solve either analytically or numerically. The nonlinearity...
Nonlinear reactive solute transport: A practical and fast solution method (1996)
Mixing cell models have been used frequently to model solute transport coupled with reactions. The main advantage of these models is their conceptual simplicity. This allows them to be solved...
Benker, E., Davis, G. B., Appleyard, S., Barry, D. A., Power, T. R.
Substantial TCE and ammonium contamination was detected in groundwater beneath a residential area in Perth, Western Australia. Investigation has successfully determined broad aspects of the extent of...
Barry, D. A., Miller, C. T., Culligan-Hensley, P. J.
Split-operator approaches are methods in widespread use for numerical solutions of reaction/transport problems. However, only a couple of analyses of truncation errors resulting from operator...
Existing sensitivity methods for spatially discrete groundwater contaminant transport models have been developed for time-stepping numerical algorithms and cannot be readily used with time-continuous...
Barry, D. A., Bajracharya, K., Miller, C. T.
Various schemes are available to solve coupled transport/reaction mathematical models, one of the most efficient and easy to apply being the two-step split- operator method in which the transport and...
Cadmium adsorption at different pore water velocities (1996)
Bajracharya, K., Tran, Y. T., Barry, D. A.
Batch and column experiments were conducted to study the effect of pore water velocity on the adsorption of cadmium (Cd) onto a homogeneous nonaggregated porous medium under controlled environmental...
Centrifuge modelling of contaminant transport processes (1996)
Culligan, P. J., Savvidou, C., Barry, D. A.
Over the past decade, research workers have started to investigate problems of subsurface contaminant transport through physical modelling on a geotechnical centrifuge. A major advantage of this...
Modeling coastal ground-water response to beach dewatering. (1996)
Li, L., Barry, D. A., Pattiaratchi, C. B.
There has been renewed interest in the use of beach dewatering as a technique to combat beach erosion. Although several test and prototype installations have been undertaken worldwide, no guidelines...
Due to the heterogeneity of natural groundwater systems, any quantitative description of aquifer hydraulic properties is subject to uncertainty. Consequently, prediction of groundwater contaminant...
Scaling Immiscible Flow in Porous Media (1996)
Centrifuge modelling is a technique that has proved useful in the study of miscible transport processes through porous media. This report presents a discussion on the feasibility of modelling...
Transport of moisture and solutes in the unsaturated zone by preferential flow (1995)
Stagnitti, F., Steenhuis, T. S., Boll, J., Pivetz, B., Barry, D. A.
Environmental Hydrology presents a unified approach to the role of hydrology in environmental planning and management, emphasizing the consideration of the hydrological continuum in determining the...
Steffy, D. A., Johnston, C., Barry, D. A.
A variety of field techniques were utilized to study the immiscible displacement of LNAPL (gasoline) above a fluctuating shallow water table. Hydrophobic and hydrophillic tensiometer measurements...
Benker, E., Davis, G. B., Barry, D. A.
A trichloroethene (TCE) plume has been identified in an unconfined sand aquifer in Perth, Western Australia. This is the first known major occurrence of groundwater contamination by chlorinated...
Efficient stochastic simulation of groundwater contaminant transport (1995)
Due to the heterogeneity of natural groundwater systems, any quantitative description of aquifer hydraulic properties is subject to uncertainty. Consequently, prediction of groundwater transport is...
Split operator methods for reactive chemical transport in groundwater (1995)
Barry, D. A., Miller, C. T., Culligan, P. J., Bajracharya, K.
Coupled solute transport and reaction models are computationally demanding when multispecies, multidimensional simulations are considered. Split-operator methods approximate solutions to the reactive...
The use of standard numerical schemes to solve nonlinear advective-dispersive equations for the estimation of parameters is CPU-time consuming and hence not desirable for routine use. An efficient...
Because of its simplicity and efficiency, the Muskingum- Cunge (M-C) method is a widely used modelling tool applied to flood routing problems. However, in the M-C method, there is an infinite number...
Real values of the W-function (1995)
Barry, D. A., Culligan-Hensley, P. J., Barry, S. J.
Approximations for real values of W(x), where W is defined by solutions of W exp(W) = x, are presented. All of the approximations have maximum absolute (|W|>1) or relative (|W|
Algorithm 743: WAPR: A FORTRAN routine for calculating real values of the W-function (1995)
Barry, D. A., Barry, S. J., Culligan-Hensley, P. J.
We implement W-function approximation scheme described by Barry et al. A range of tests of the approximations is included so that the code can be assessed on any given machine. Users can calculate...
Infiltration under ponded conditions: 4. An explicit predictive infiltration formula. (1995)
Barry, D. A., Haverkamp, R., Ross, P. J.
An approximation to an implicit infiltration formula presented earlier in this series is developed. At worst, the relative error of the approximation is always less than 1%, and it is much better...
On the Muskingum-Cunge flood routing method. (1995)
For practical problems, efficient but accurate solution methods are usually preferred to computationally expensive but extremely accurate ones. The Muskingum-Cunge (M-C) method is an efficient...
Analysis of one-dimensional multispecies transport experiments in laboratory soil columns. (1995)
A numerical scheme based on the mixing cell concept is used to analyse multispecies solute transport under the condition of steady flow. Explicit examples are presented for the case of two chemical...
Sorptivity calculation for arbitrary diffusivity (1994)
Barry, D. A., Parlange, M. B., Lockington, D. A., Haverkamp, R.
Physical basis of nonequilibrium solute transport in soil (1994)
Nonequilibrium solute transport results from both chemical and physical mechanisms. In saturated porous media the physical causes are usually taken to be film diffusion and intra-particle diffusion....
Benker, E., Davis, G. B., Appleyard, S., Barry, D. A., Power, T. R.
Substantial TCE and ammonia contamination was detected in groundwater beneath a residential area in Perth. Investigation has successfully determined broad aspects of the extent of the TCE plume and...
Barry, D. A., Bajracharya, K., Li, L.
Nonequilibrium transport of solute in porous media typically refers to any time-dependent process additional to the usual advection and dispersion transport mechanisms. Nonequilibrium solute...
Note on common mixing cell models (1994)
Different types of mixing cell models are analysed in detail. One type is found to be second-order accurate when reactions are not considered but reduces to first-order accuracy when a sorption...
Li, L., Barry, D. A., Stone, K. J. L.
This paper presents results of centrifugal modelling of physical nonequilibrium transport of nonsorbing solute in a locally inhomogeneous soil. Mathematical modelling of this class of transport...
Mass transfer in soils with local stratification of hydraulic conductivity (1994)
Li, L., Barry, D. A., Culligan-Hensley, P. J., Bajracharya, K.
The two-region model was developed originally to describe nonsorbing chemical transport in soils with dead-end pores based on the concept of mobile and immobile regions in the soil. It has been shown...
Sorptivity calculation for arbitrary diffusivity. (1994)
Barry, D. A., Parlange, M. B., Lockington, D. A., Haverkamp, R.
An estimate of the sorptivity that requires only the knowledge of simple integrals of the soil-water diffusivity weighted by a power of the water content is present. The result is checked...
A class of exact solutions for Richards’ equation (1993)
Barry, D. A., Sander, G. C., Sivaplan, M.
A new solution satisfying Richards' equation is derived. The solution, which may be applied for infiltration or capillary rise, is valid for the condition of an arbitrary moisture tension imposed at...
Mixing cell models for nonlinear equilibrium single species adsorption and transport. (1993)
A simple improved mixing cell model is shown to be more accurate than the standard mixing cell model when used to solve solute transport problems with a nonlinear adsorption isotherm included. The...
We derive a simple approximation for the steady-state distribution of solute subject to an arbitrary, irreversible transformation in a soil profile under the condition of steady fluid flow. The...
Mixing cell models for nonlinear nonequilibrium single species adsorption and transport. (1993)
The oft-used “standard” mixing cell model describing reactive solute transport is extended to cater for nonequilibrium reactions. For tracer transport, the standard model is second-order accurate...
The problem of estimating model parameters is encountered frequently in practice. There are several packages available for estimating the parameters for linear advection-dispersion equations (ADE)...
Modelling contaminant transport in the subsurface: Theory and computer programs (1992)
Modeling Chemical Transport in Soils: Natural and Applied Contaminants provides a comprehensive discussion of mathematical models used to anticipate and predict the consequences and fate of natural...
Exit condition for miscible displacement experiments in finite columns. (1992)
Starr, J. L., Van Genuchten, M. Th., Barry, D. A., Parker, J. C.
The one-dimensional solute transport is analyzed with the convection-dispersion model, including first and zeroth order irreversible reaction. A simple analytical expression is derived for the...
Note on the sorptivity for mixed saturated-unsaturated flow (1992)
Barry, D. A., Parlange, M. B., Haverkamp, R.
An approximate, but general, analytical result for the sorptivity of a soil is derived. It provides an estimate of the sorptivity when ponding occurs at the soil surface, or when the diffusivity is...
Modelling solute transport, chemical adsorption and cation exchange (1991)
Barry, D. A., Sander, G. C., Phillips, I. R.
We present an analytical model describing solute transport subject to nonlinear solute adsorption and demonstrate the exact correspondence of the model with water infiltration. The model is applied...
An approximately minimum variance jackknife (1991)
Jackknifing is a nonparametric method of reducing bias in estimation procedures. The reduced-bias jackknife estimate is not, in general, a minimum variance (MV)estimate. The generalized jackknife is...
Several authors have now used the Backlund transformation to linearize Richard's equation and so obtain analytical solutions for infiltration and redistribution processes for the linearizable class...
Three-dimensional statistical moment analysis of the Stanford/Waterloo Borden tracer data. (1990)
We estimate the mass, mean position vector, and covariance tensor of the bromide plume investigated at the Borden site (Ontario, Canada) by researchers from Stanford University and the University of...
Supercomputers and their use in modeling subsurface solute transport. (1990)
Supercomputers offer a wide range of possibilities for advancing knowledge and solving difficult, real-world problems. Solute transport-related theory and applications have long been an area of...
Mathematical studies of solute transport in porous media have often utilized “equivalent” models of the transport process to remove undesired variability in the transport coefficients at the...
Application of the convection-dispersion model to solute transport in finite soil columns (1988)
The one-dimensional convection-dispersion model is investigated with respect to the proper boundary conditions to impose in applications to tracer movement in freely draining soil columns. It is...
On the Dagan model of solute transport in groundwater: Application to the Borden site. (1988)
Barry, D. A., Coves, J., Sposito, G.
In the first part of this study, Sposito and Barry (1987) derived an ensemble-mean convection-dispersion equation (CDE) for tracer solute transport subject to a random velocity field. It was shown...
TFMFIT: A Program to Fit a Generalized Convection- Dispersion Model to Experimental Data (1988)
Barry, D. A., Sposito, G., Coves, J.
The task of obtaining estimates of model parameters (the "inverse problem") is encountered frequently in practice. The transfer function model is a general formulation describing solute transport...
Approximations to solute transport in porous media with flow transverse to layering. (1987)
Analytical approaches for the prediction of solute transport in layered porous media are investigated for the case of flow perpendicular to the direction of layering. One approach involves the use of...
Numerical analysis of the precursor effect (1987)
The precursor effect occurs when a dilute influent solution displaces a high-concentration resident solution. Some of the influent material is transported with the resident solution and appears...
On the Dagan model of solute transport in groundwater: Foundational aspects (1987)
The convection-dispersion equation (CDE) developed by Dagan [1984] to predict the ensemble-average concentration of a conservative solute in groundwater has been used successfully to interpret recent...
Theoretical investigations and numerical and laboratory experiments were conducted to evaluate the feasibility and limitations of describing solute transport and water flow in regularly structured...
Kinematic flow approximation to runoff on a plane: An approximate analytical solution. (1983)
Rose, C. W., Sander, G. C., Campbell, S. Y., Barry, D. A.
A new theory is given which relates excess rainfall to runoff for overland flow on a plane. The theory assumes that rate of change of water flux with distance down the plane is constant at any time,...
Numerical analysis of the snow-plow effect (1983)
Barry, D. A., Starr, J. L., Braddock, R. D.
A mathematical model describing the snow-plow effect, i.e. the removal of adsorbed ions from soil particles by an incoming solution with relatively high solute concentration, is analyzed. It is shown...
Rose, C. W., Williams, J. R., Sander, G. C., Barry, D. A.
The paper describes a new mathematical model of soil erosion and deposition on a plane land element. The model makes use of an approximate analytic theory of runoff on a plane assuming kinematic...
Rose, C. W., Williams, J. R., Sander, G. C., Barry, D. A.
Mathematical theory for soil erosion and deposition processes on a plane land element was applied to data on runoff and sediment concentration as a function of time for nine runoff events from a...
Theory of solute movement in soils from the method of characteristics. (1983)
Barry, D. A., Saffigna, P. G., Rose, C. W.
A general theory of vertical solute movement in a soil is presented, which takes into account uptake of water and solute by roots, irrigation or rainfall, and solute application and adsorption by the...
Starr, J. L., Barry, D. A., Braddock, R. D.
The transport of a solute in a soil column is considered for zero-order kinetics. The visible displacement of the solute is affected by dispersion. The dispersion coefficient enters both the...
Bioclogging in porous media: Model development and sensitivity to initial conditions
Brovelli, A, Malaguerra, F, Barry, D A
This work presents a numerical model able to simulate the effect of biomass growth on the hydraulic properties of saturated porous media, i.e., bioclogging. A new module for an existing coupled flow...
Modelling carbon and nitrogen turnover in variably saturated soils
Batlle-Aguilar, J., Brovelli, A., Porporato, A., Barry, D.A.
Natural ecosystems provide services such as ameliorating the impacts of deleterious human activities on both surface and groundwater. For example, several studies have shown that a healthy riparian...
Parameter Changes from Upscaling of a Local Scale, Process-Based Erosion Model
Jomaa, S, Barry, D.A, Sander, G.C, Heng, B.C.P
Soil erosion affects agricultural productivity, the natural environment and infrastructure security. Soil loss and its associated impacts are important environmental problems. Consequently,...