Ronald W Harvey (Former Employee)
Science and Products
Filter Total Items: 80
Stochastic analysis of virus transport in aquifers Stochastic analysis of virus transport in aquifers
A large-scale model of virus transport in aquifers is derived using spectral perturbation analysis. The effects of spatial variability in aquifer hydraulic conductivity and virus transport (attachment, detachment, and inactivation) parameters on large-scale virus transport are evaluated. A stochastic mean model of virus transport is developed by linking a simple system of local-scale...
Authors
Linda L. Campbell Rehmann, Claire Welty, Ronald W. Harvey
The role of groundwater chemistry in the transport of bacteria to water-supply wells The role of groundwater chemistry in the transport of bacteria to water-supply wells
Static mini-columns and in situ injection and recovery tests were used to assess the effects of modest changes in groundwater chemistry upon the pH-dependence of bacterial attachment, a primary determinant of bacterial mobility in drinking water aquifers. In uncontaminated groundwater (
Authors
R.W. Harvey, D.W. Metge
Bacteriophage PRD1 and silica colloid transport and recovery in an iron oxide-coated sand aquifer Bacteriophage PRD1 and silica colloid transport and recovery in an iron oxide-coated sand aquifer
Bacteriophage PRD1 and silica colloids were co-injected into sewage-contaminated and uncontaminated zones of an iron oxide-coated sand aquifer on Cape Cod, MA, and their transport was monitored over distances up to 6 m in three arrays. After deposition, the attached PRD1 and silica colloids were mobilized by three different chemical perturbations (elevated pH, anionic surfactant, and...
Authors
J. N. Ryan, M. Elimelech, R.A. Ard, R.W. Harvey, P.R. Johnson
Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer
Time series incubations were conducted to provide estimates for the size selectivities and rates of protistan grazing that may be occurring in a sandy, contaminated aquifer. The experiments involved four size classes of fluorescently labeled groundwater bacteria (FLB) and 2- to 3-μm-long nanoflagellates, primarily Spumella guttula(Ehrenberg) Kent, that were isolated from contaminated...
Authors
N.E. Kinner, R.W. Harvey, K. Blakeslee, G. Novarino, L.D. Meeker
In situ and laboratory methods to study subsurface microbial transport In situ and laboratory methods to study subsurface microbial transport
No abstract available.
Authors
Ronald W. Harvey
Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests
Buoyant densities were determined for groundwater bacteria and microflagellates (protozoa) from a sandy aquifer (Cape Cod, MA) using two methods: (1) density-gradient centrifugation (DGC) and (2) Stoke's law approximations using sedimentation rates observed during natural-gradient injection and recovery tests. The dwarf (average cell size, 0.3 μm), unattached bacteria inhabiting a...
Authors
R.W. Harvey, D.W. Metge, N. Kinner, N. Mayberry
Science and Products
Filter Total Items: 80
Stochastic analysis of virus transport in aquifers Stochastic analysis of virus transport in aquifers
A large-scale model of virus transport in aquifers is derived using spectral perturbation analysis. The effects of spatial variability in aquifer hydraulic conductivity and virus transport (attachment, detachment, and inactivation) parameters on large-scale virus transport are evaluated. A stochastic mean model of virus transport is developed by linking a simple system of local-scale...
Authors
Linda L. Campbell Rehmann, Claire Welty, Ronald W. Harvey
The role of groundwater chemistry in the transport of bacteria to water-supply wells The role of groundwater chemistry in the transport of bacteria to water-supply wells
Static mini-columns and in situ injection and recovery tests were used to assess the effects of modest changes in groundwater chemistry upon the pH-dependence of bacterial attachment, a primary determinant of bacterial mobility in drinking water aquifers. In uncontaminated groundwater (
Authors
R.W. Harvey, D.W. Metge
Bacteriophage PRD1 and silica colloid transport and recovery in an iron oxide-coated sand aquifer Bacteriophage PRD1 and silica colloid transport and recovery in an iron oxide-coated sand aquifer
Bacteriophage PRD1 and silica colloids were co-injected into sewage-contaminated and uncontaminated zones of an iron oxide-coated sand aquifer on Cape Cod, MA, and their transport was monitored over distances up to 6 m in three arrays. After deposition, the attached PRD1 and silica colloids were mobilized by three different chemical perturbations (elevated pH, anionic surfactant, and...
Authors
J. N. Ryan, M. Elimelech, R.A. Ard, R.W. Harvey, P.R. Johnson
Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer
Time series incubations were conducted to provide estimates for the size selectivities and rates of protistan grazing that may be occurring in a sandy, contaminated aquifer. The experiments involved four size classes of fluorescently labeled groundwater bacteria (FLB) and 2- to 3-μm-long nanoflagellates, primarily Spumella guttula(Ehrenberg) Kent, that were isolated from contaminated...
Authors
N.E. Kinner, R.W. Harvey, K. Blakeslee, G. Novarino, L.D. Meeker
In situ and laboratory methods to study subsurface microbial transport In situ and laboratory methods to study subsurface microbial transport
No abstract available.
Authors
Ronald W. Harvey
Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: Results of in-situ and laboratory tests
Buoyant densities were determined for groundwater bacteria and microflagellates (protozoa) from a sandy aquifer (Cape Cod, MA) using two methods: (1) density-gradient centrifugation (DGC) and (2) Stoke's law approximations using sedimentation rates observed during natural-gradient injection and recovery tests. The dwarf (average cell size, 0.3 μm), unattached bacteria inhabiting a...
Authors
R.W. Harvey, D.W. Metge, N. Kinner, N. Mayberry