Clifford I Voss, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 78
Sampling design for groundwater solute transport: Tests of methods and analysis of Cape Cod tracer test data Sampling design for groundwater solute transport: Tests of methods and analysis of Cape Cod tracer test data
Tests of a one-dimensional sampling design methodology on measurements of bromide concentration collected during the natural gradient tracer test conducted by the U.S. Geological Survey on Cape Cod, Massachusetts, demonstrate its efficacy for field studies of solute transport in groundwater and the utility of one-dimensional analysis. The methodology was applied to design of sparse two...
Authors
Debra S. Knopman, Clifford I. Voss, Stephen P. Garabedian
Multiobjective sampling design for parameter estimation and model discrimination in groundwater solute transport Multiobjective sampling design for parameter estimation and model discrimination in groundwater solute transport
Sampling design for site characterization studies of solute transport in porous media is formulated as a multiobjective problem. Optimal design of a sampling network is a sequential process in which the next phase of sampling is designed on the basis of all available physical knowledge of the system. Three objectives are considered: model discrimination, parameter estimation, and cost...
Authors
Debra S. Knopman, Clifford I. Voss
Further comments on sensitivities, parameter estimation, and sampling design in one-dimensional analysis of solute transport in porous media Further comments on sensitivities, parameter estimation, and sampling design in one-dimensional analysis of solute transport in porous media
Sensitivities of solute concentration to parameters associated with first-order chemical decay, boundary conditions, initial conditions, and multilayer transport are examined in one-dimensional analytical models of transient solute transport in porous media. A sensitivity is a change in solute concentration resulting from a change in a model parameter. Sensitivity analysis is important...
Authors
Debra S. Knopman, Clifford I. Voss
Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design
The spatial and temporal variability of sensitivities has a significant impact on parameter estimation and sampling design for studies of solute transport in porous media. Physical insight into the behavior of sensitivities is offered through an analysis of analytically derived sensitivities for the one-dimensional form of the advection-dispersion equation. When parameters are estimated...
Authors
Debra S. Knopman, Clifford I. Voss
Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications
Methodologies that account for specific types of chemical reactions in the simulation of solute transport can be developed so they are compatible with solution algorithms employed in existing transport codes. This enables the simulation of reactive transport in complex multidimensional flow regimes, and provides a means for existing codes to account for some of the fundamental chemical...
Authors
F.M. Lewis, Clifford I. Voss, J. Rubin
Aquifer reclamation design: The use of contaminant transport simulation combined with nonlinear programing Aquifer reclamation design: The use of contaminant transport simulation combined with nonlinear programing
A simulation-management methodology is demonstrated for the rehabilitation of aquifers that have been subjected to chemical contamination. Finite element groundwater flow and contaminant transport simulation are combined with nonlinear optimization. The model is capable of determining well locations plus pumping and injection rates for groundwater quality control. Examples demonstrate...
Authors
Steven M. Gorelick, Clifford I. Voss, Philip E. Gill, Walter Murray, Michael A. Saunders, Margaret H. Wright
Science and Products
Filter Total Items: 78
Sampling design for groundwater solute transport: Tests of methods and analysis of Cape Cod tracer test data Sampling design for groundwater solute transport: Tests of methods and analysis of Cape Cod tracer test data
Tests of a one-dimensional sampling design methodology on measurements of bromide concentration collected during the natural gradient tracer test conducted by the U.S. Geological Survey on Cape Cod, Massachusetts, demonstrate its efficacy for field studies of solute transport in groundwater and the utility of one-dimensional analysis. The methodology was applied to design of sparse two...
Authors
Debra S. Knopman, Clifford I. Voss, Stephen P. Garabedian
Multiobjective sampling design for parameter estimation and model discrimination in groundwater solute transport Multiobjective sampling design for parameter estimation and model discrimination in groundwater solute transport
Sampling design for site characterization studies of solute transport in porous media is formulated as a multiobjective problem. Optimal design of a sampling network is a sequential process in which the next phase of sampling is designed on the basis of all available physical knowledge of the system. Three objectives are considered: model discrimination, parameter estimation, and cost...
Authors
Debra S. Knopman, Clifford I. Voss
Further comments on sensitivities, parameter estimation, and sampling design in one-dimensional analysis of solute transport in porous media Further comments on sensitivities, parameter estimation, and sampling design in one-dimensional analysis of solute transport in porous media
Sensitivities of solute concentration to parameters associated with first-order chemical decay, boundary conditions, initial conditions, and multilayer transport are examined in one-dimensional analytical models of transient solute transport in porous media. A sensitivity is a change in solute concentration resulting from a change in a model parameter. Sensitivity analysis is important...
Authors
Debra S. Knopman, Clifford I. Voss
Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design Behavior of sensitivities in the one-dimensional advection-dispersion equation: Implications for parameter estimation and sampling design
The spatial and temporal variability of sensitivities has a significant impact on parameter estimation and sampling design for studies of solute transport in porous media. Physical insight into the behavior of sensitivities is offered through an analysis of analytically derived sensitivities for the one-dimensional form of the advection-dispersion equation. When parameters are estimated...
Authors
Debra S. Knopman, Clifford I. Voss
Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications
Methodologies that account for specific types of chemical reactions in the simulation of solute transport can be developed so they are compatible with solution algorithms employed in existing transport codes. This enables the simulation of reactive transport in complex multidimensional flow regimes, and provides a means for existing codes to account for some of the fundamental chemical...
Authors
F.M. Lewis, Clifford I. Voss, J. Rubin
Aquifer reclamation design: The use of contaminant transport simulation combined with nonlinear programing Aquifer reclamation design: The use of contaminant transport simulation combined with nonlinear programing
A simulation-management methodology is demonstrated for the rehabilitation of aquifers that have been subjected to chemical contamination. Finite element groundwater flow and contaminant transport simulation are combined with nonlinear optimization. The model is capable of determining well locations plus pumping and injection rates for groundwater quality control. Examples demonstrate...
Authors
Steven M. Gorelick, Clifford I. Voss, Philip E. Gill, Walter Murray, Michael A. Saunders, Margaret H. Wright